Indications for platelet transfusions in infants less than 4 months of age include all of the following platelet counts and clinical situations EXCEPT
Rationale:
C: <20 × 10¹/L and stable. In infants less than 4 months, a platelet count below 20 × 10¹/L typically warrants transfusion if accompanied by clinical instability or bleeding, not when stable.
A: <100 × 10¹/L and bleeding. This situation necessitates transfusion as significant bleeding indicates an urgent need for increased platelet levels regardless of the count.
B: <50 × 10¹/L and invasive procedure. Transfusion is essential here to prevent excessive bleeding during procedures, as low platelet counts increase the risk of hemorrhage.
D: <50 × 10¹/L and immune mediated. This scenario often requires transfusion to manage the low count effectively, especially when immune factors are involved, posing a risk of bleeding.
If the patient described in Questions 10-12 does not experience improvement in his anemia, which of the following should be explored (choose as many as are appropriate)?
Rationale:
Gastrointestinal blood loss should be explored. This condition can be a significant contributor to persistent anemia, especially if the patient shows no improvement despite treatment, necessitating further investigation into potential sources of bleeding.
B: Thalassemia. While thalassemia can cause anemia, it typically presents with specific genetic markers and symptoms, which may not align with the patient's current clinical picture and lack of response.
C: Sickle cell anemia. This condition is characterized by specific symptoms and crises, and if the patient is not experiencing these, it is less likely to be the underlying cause of anemia.
D: Urinary tract infection. Although UTIs can cause general malaise and other symptoms, they are unlikely to be a direct cause of anemia, especially when gastrointestinal issues are a more probable source.
Which of the following drugs is least likely to cause thrombocytopenia in children?
Rationale:
B: Phenytoin is least likely to cause thrombocytopenia in children due to its established safety profile in pediatric use, where it is commonly prescribed for seizure management without significant hematological side effects.
A: Valproic acid has a known association with thrombocytopenia, particularly in children, where it can lead to decreased platelet production and increased risk of bleeding.
C: Sulfonamides have been linked to various adverse effects, including thrombocytopenia, particularly in sensitive populations like children, due to their effects on bone marrow function.
D: Trimethoprim-sulfamethoxazole can also induce thrombocytopenia, especially in pediatric patients, due to its potential to affect platelet aggregation and production in the bone marrow.
Prednisone is given to children being treated for leukemia. Why is this medication included in the treatment plan?
Rationale:
Prednisone destroys abnormal lymphocytes. This medication is included in the treatment plan for leukemia as it effectively targets and reduces the number of malignant cells, thus improving treatment outcomes and overall survival rates in pediatric patients.
A: Enhances protein metabolism. This option does not directly relate to leukemia treatment; prednisone's primary function is not to improve protein metabolism in the context of cancer therapy.
B: Enhances sodium excretion. While prednisone can influence fluid balance, the focus in leukemia treatment is on its capacity to eliminate abnormal lymphocytes rather than its effects on sodium levels.
C: Increases absorption of the chemotherapy. Prednisone does not enhance the absorption of chemotherapy drugs; rather, it functions by directly attacking malignant cells, thus supporting the overall treatment strategy.
The LEAST helpful historical clue in Iron deficiency anemia is
Rationale:
D: Giardia lamblia infection is the least helpful historical clue in iron deficiency anemia, as it primarily affects gastrointestinal health and does not directly indicate iron status or deficiency-related symptoms.
A: Pica indicates cravings for non-food items, often linked to iron deficiency, making it a significant symptom in diagnosing the condition.
B: Age provides essential context since iron deficiency anemia can present differently across various life stages, influencing diagnosis and management.
C: Ingestion of cow's milk is relevant, as excessive consumption can inhibit iron absorption, thus playing a crucial role in understanding a patient's anemia status.
A 5-year-old child has multiple bruises on her extremities and oral mucosal bleeding of 3 days duration; she had a mild respiratory tract infection 2 weeks before; physical examination was normal apart from multiple ecchymoses and petechiae. Of the following, the NEXT diagnostic step is
Rationale:
A complete blood count should be the next diagnostic step. This test will help assess the child's platelet count and identify any hematological issues contributing to the bruising and bleeding symptoms.
B: prothrombin time Evaluating prothrombin time focuses on the extrinsic coagulation pathway, which may not directly address the child's evident bruising and oral bleeding related to potential platelet disorders.
C: bleeding time This test evaluates platelet function but may not provide sufficient information on the overall blood count, which is necessary to understand the child's bruising and bleeding better.
D: partial thromboplastin time This test assesses the intrinsic pathway of coagulation, yet it does not offer insights into platelet levels, which are crucial in this child's case of multiple bruises.
You are explaining the risk of sepsis after splenectomy to medical students. An important statement that should be included during this discussion is that risk is especially high in children
Rationale:
Children with chronic immune thrombocytopenia (ITP) face a heightened risk of sepsis following splenectomy due to their compromised immune response, making them particularly vulnerable to infections post-surgery.
A: older than 5 yr at the time of surgery. Although older children may still be at risk, the specific vulnerability associated with chronic conditions like ITP significantly elevates sepsis risk compared to age alone.
B: with hereditary spherocytosis. While hereditary spherocytosis can impact immune function, it does not inherently increase sepsis risk after splenectomy to the same degree as chronic immune conditions like ITP.
D: after trauma. Trauma can lead to the need for splenectomy, but the risk of sepsis is not exclusively higher in this scenario compared to children with chronic immune disorders like ITP.
Constrictive pericarditis secondary to radiation exposure with sings of increase in pulmonary pressure. The child received a course of irradiation which leads to
Rationale:
Constrictive pericarditis secondary to radiation exposure leads to the diagnosis of radiation exposure. The context indicates that the child’s condition developed as a direct consequence of previous irradiation, linking the two.
A: tuberculosis This choice suggests an infectious etiology, which does not align with the clear connection between radiation exposure and the child’s current symptoms.
C: postsurgical This implies a history of surgery causing the condition, but the extract specifies radiation exposure as the primary factor leading to constrictive pericarditis.
D: idiopathic This indicates an unknown cause, contradicting the established link between the child's symptoms and the documented radiation exposure in the context provided.
A 5-year- old boy presented to the emergency department with sudden onset of skin ecchymoses and single attack of epistaxis, the history is negative for any significant event except for preceding upper respiratory tract infection. The examination showed an active healthy looking boy with diffuse skin petechial rash and ecchymoses over both lower and upper limbs, no lymphadenopathy and no organomegaly. The initial CBC is as follows: Hb 12.3 gm/dl, WBC 7.600/cmm, N 45%, L 51%, plt 17.000/cmm, and normal looking film except for rarely seen platelets. The most likely diagnosis is:
Rationale:
Immune thrombocytopenia. The boy's sudden onset of skin ecchymoses, petechial rash, and low platelet count of 17,000/cmm strongly indicate immune thrombocytopenia, especially given the absence of significant past events or organomegaly.
B: Acute leukemia. The normal white blood cell count along with no signs of lymphadenopathy or organomegaly does not support this diagnosis.
C: Aplastic anemia. This condition typically presents with low blood cell counts across all lineages, not isolated thrombocytopenia as seen here.
D: Hemophilia A. This disorder primarily causes bleeding issues related to clotting factors, not isolated thrombocytopenia with the described symptoms.
A 62-year-old man underwent right total knee replacement 8 days ago. Swelling has developed in his right lower extremity, and Doppler ultrasonography confirms the presence of a right superficial femoral vein thrombosis. His current medications include oxycodone and subcutaneous unfractionated heparin. Results of preoperative tests, including a complete blood cell count and liver and kidney function, were normal. Other laboratory data include the following: hemoglobin 12.2 g/dL, leukocyte count 8.5 × 10^9/L, and platelet count 60 × 10^9/L. In addition to stopping the use of subcutaneous heparin, what is the next most appropriate step in management of this patient?
Rationale:
Start direct thrombin inhibitor therapy.
Direct thrombin inhibitors are effective in managing superficial femoral vein thrombosis, especially when heparin use must be discontinued. They provide rapid anticoagulation, reducing thrombus progression and complications, making them ideal in this patient's scenario.
A: Start low-molecular-weight heparin therapy. Low-molecular-weight heparin is not suitable here, as the patient requires an alternative anticoagulant due to the discontinuation of subcutaneous heparin.
B: Start intravenous therapeutic doses of heparin. Transitioning to intravenous heparin is not appropriate since the patient has experienced complications related to heparin therapy and needs a different anticoagulant.
D: Start aspirin therapy. Aspirin does not provide sufficient anticoagulation for treating vein thrombosis and would be inadequate for addressing the patient's current condition and risks.
It is a common complication after an open heart surgery due to immunological phenomena with up to 30% of cardiac surgery. Treatment is usually with anti-inflammatory medications and colchicine.
Rationale:
It is postpericardiotomy syndrome. This condition often arises as a complication following open heart surgery, characterized by inflammation of the pericardium, and responds well to anti-inflammatory medications and colchicine treatment.
A: pericarditis Inflammation of the pericardium can occur post-surgery but does not specifically describe the syndrome that includes multiple symptoms following surgical intervention.
B: myocarditis This condition refers to inflammation of the heart muscle itself, not the pericardium, and is not specifically linked to the surgical context described in the question.
One of the following features DOES NOT fit hemophilia A
Rationale:
Normal ristocetin-induced platelet agglutination does not fit hemophilia A.
Hemophilia A is characterized by a deficiency of factor VIII, leading to prolonged partial thromboplastin time, while platelet function remains intact, allowing for normal ristocetin-induced agglutination. Consequently, prolonged prothrombin time is not associated with this condition, as it primarily affects the intrinsic pathway rather than the extrinsic pathway affected by prothrombin time.
A: normal ristocetin-induced platelets agglutination. This feature remains intact in hemophilia A due to normal platelet function, distinguishing it from other coagulopathies associated with platelet dysfunction.
C: prolonged partial thromboplastin time. This condition is a hallmark of hemophilia A, as the deficiency in factor VIII specifically affects the intrinsic pathway, leading to prolonged test results.
D: low factor VIII activity. This directly indicates hemophilia A, where the deficiency in factor VIII is the defining characteristic, resulting in the bleeding manifestations associated with this disorder.
Matching: Hemolytic anemia - Oxidant stressors
Rationale:
Hemolytic anemia is associated with hereditary pyropoikilocytosis due to its sensitivity to oxidant stressors, leading to abnormal red blood cell shapes and increased destruction under oxidative conditions.
A: Hereditary spherocytosis involves a defect in the red blood cell membrane, causing increased fragility but does not primarily relate to oxidant stressors as a key factor.
B: Autoimmune hemolytic anemia results from the immune system attacking red blood cells, which is not directly linked to oxidant stressors affecting cell integrity or shape.
D: Sickle cell anemia primarily involves abnormal hemoglobin polymerization under low oxygen conditions, rather than the impact of oxidant stressors on red blood cell morphology.
Matching: For each of the following disorders, select the appropriate platelet presentation - Wiskott-Aldrich
Rationale:
Platelets decreased in number. Wiskott-Aldrich syndrome is characterized by thrombocytopenia, leading to a significantly reduced platelet count. This decrease results in a higher risk of bleeding and bruising, reflecting the disorder's impact on platelet production and function.
B: Platelet count normal. Normal platelet levels contradict the known effects of Wiskott-Aldrich syndrome, which prominently includes decreased platelet production and subsequent health complications related to low platelet counts.
C: Platelets increased. An increase in platelet count does not align with Wiskott-Aldrich syndrome, as the condition specifically results in thrombocytopenia, highlighting a deficiency rather than an abundance of platelets.
Which best describes the action of chemotherapeutic agents used in treating cancer in children?
Rationale:
D: They interrupt the cell cycle, thereby causing cell death. Chemotherapeutic agents target rapidly dividing cancer cells by disrupting various phases of the cell cycle, leading to apoptosis and inhibiting tumor growth effectively in pediatric patients.
A: They suppress the function of normal lymphocytes. While chemotherapeutic agents can affect immune cells, their primary action focuses on cancer cells rather than directly suppressing normal lymphocyte functions.
B: They are alkylating agents and are cell-specific. Not all chemotherapeutic agents are alkylating; many act non-specifically on all rapidly dividing cells, affecting both cancerous and healthy tissues.
C: They cause DNA replication and are cell-specific. Chemotherapeutic agents do not promote DNA replication; instead, they inhibit cell division and replication processes in cancer cells, leading to their destruction.
Which of the following results indicates Iron deficiency anemia?
Rationale:
High red cell distribution width indicates Iron deficiency anemia. This condition arises due to a lack of adequate iron, leading to a variation in red blood cell size, which is reflected in an increased red cell distribution width.
A: high serum ferritin High serum ferritin levels suggest an abundance of iron in the body, which contradicts the characteristics of Iron deficiency anemia where iron stores are depleted.
C: increased marrow iron Increased marrow iron levels indicate sufficient iron availability for red blood cell production, which does not align with the deficiency seen in Iron deficiency anemia.
D: raised marrow sideroblasts Raised marrow sideroblasts are typically associated with certain types of anemia related to lead poisoning or thalassemia, not with Iron deficiency anemia specifically, which involves low iron levels.
Inherited thrombocytopenias include all the following EXCEPT
Rationale:
Inherited thrombocytopenias include all the following EXCEPT Glanzmann's Thrombasthenia. This condition is not inherited but rather a result of impaired platelet function due to specific genetic mutations affecting the platelet receptors, distinguishing it from true inherited thrombocytopenias.
A: congenital Amegakaryocytic Thrombocytopenia This condition arises from a genetic defect resulting in reduced megakaryocyte production, directly leading to significantly low platelet counts, categorizing it under inherited thrombocytopenias.
B: thrombocytopenia with Absent Radii (TAR) Syndrome TAR Syndrome is a genetic disorder characterized by absent radii in the forearms and low platelet counts, making it a recognized inherited thrombocytopenia.
D: Bernard-Soulier Syndrome This syndrome involves a genetic defect in platelet receptors, causing large platelets and low counts, thus classifying it as an inherited thrombocytopenia.
Elevated serum transferrin receptor levels signify
Rationale:
Elevated serum transferrin receptor levels signify iron deficiency. This increase indicates that the body is attempting to compensate for low iron availability, as transferrin receptors are upregulated to enhance iron absorption from the bloodstream.
B: ferritinemia High ferritin levels typically indicate iron overload or inflammation, which does not correlate with elevated transferrin receptor levels that specifically signal iron deficiency.
C: acute phase responses During acute inflammation, transferrin receptor levels may not rise significantly, as the body prioritizes other responses, making this option inconsistent with elevated receptor levels.
D: erythrocyte marrow hypoproliferation Low erythrocyte production does not directly cause elevated transferrin receptor levels; rather, these receptors respond primarily to iron needs, not to red blood cell production rates.
Which of the following agents helps in decreasing the frequency of vasoocclusive crises in children with sickle cell disease?
Rationale:
Hydroxyurea helps in decreasing the frequency of vasoocclusive crises in children with sickle cell disease.
This medication works by increasing fetal hemoglobin levels and promoting red blood cell hydration, which reduces the sickling of cells and consequently lessens the occurrence of painful crises in affected children.
A: Cyclosporine Primarily used as an immunosuppressant, cyclosporine does not address the underlying pathology of sickle cell disease and thus does not effectively reduce vasoocclusive crises.
B: Azathioprine While azathioprine is an immunosuppressant used for various conditions, it lacks the specific mechanism needed to alleviate the complications associated with sickle cell disease crises.
D: Tacrolimus Another immunosuppressant, tacrolimus does not target the underlying factors contributing to vasoocclusive crises in sickle cell disease, making it ineffective in this context.
A child with leukemia receiving chemotherapy is complaining of nausea. The nurse has been giving scheduled antiemetics. Which of the following should the nurse do when the child is nauseated?
Rationale:
Offering cool, clear liquids is the best approach for a child experiencing nausea due to chemotherapy. These fluids can help prevent dehydration while being gentle on the stomach, making them easier to tolerate.
A: Encourage low-protein foods. Low-protein foods do not specifically address nausea relief and might not provide adequate nutrition during chemotherapy treatment, which is crucial for recovery.
B: Encourage low-caloric foods. Low-caloric foods may fail to meet the child's nutritional needs and do not effectively alleviate nausea, which requires more supportive dietary choices.
C: Offer the child's favorite foods. While favorite foods may seem comforting, they can sometimes exacerbate nausea or be unappealing during treatment, not providing the necessary hydration or relief.
Which liver protein plays a key role in iron homeostasis?
Rationale:
Hepcidin plays a key role in iron homeostasis. This protein regulates iron absorption and distribution in the body by inhibiting iron transporters, thereby maintaining appropriate iron levels and preventing overload or deficiency.
A: Albumin primarily functions as a carrier protein in the bloodstream, transporting various substances, but it does not specifically regulate iron levels or contribute to iron homeostasis.
B: Fibronectin is involved in cell adhesion and matrix organization, playing a critical role in wound healing and tissue repair, but it lacks a direct function in iron regulation.
C: Opsonin refers to molecules that enhance phagocytosis by marking pathogens for destruction, thus playing a role in immune response rather than regulating iron levels in the body.
Matching: Red blood cell aplasia - X-linked recessive
Rationale:
Red blood cell aplasia is not classified as X-linked recessive, making "Neither" the appropriate answer. Both Diamond-Blackfan anemia and transient erythroblastopenia of childhood have different genetic causes and inheritance patterns, not specifically linked to X-linked recessive traits.
A: Diamond-Blackfan This condition is primarily an autosomal dominant disorder, not X-linked, leading to red blood cell aplasia, which does not align with the question’s criteria.
B: Transient erythroblastopenia of childhood This condition typically occurs sporadically and is not inherited in an X-linked recessive manner, disqualifying it from being a correct match for the question.
C: Both This option incorrectly suggests that both conditions are X-linked recessive, while they actually follow different genetic inheritance patterns, thus failing to satisfy the question’s requirements.
A non-hematological cause of bleeding includes
Rationale:
D: Ehlers-Danlos syndrome is a connective tissue disorder that affects skin, joints, and blood vessels, leading to increased fragility and bleeding. This condition exemplifies a non-hematological cause of bleeding, as it originates from structural abnormalities rather than blood disorders.
A: hepatic failure Impaired liver function affects clotting factor production, but this is a hematological concern related to blood coagulation rather than a direct, structural cause of bleeding.
B: Wiskott-Aldrich syndrome This genetic disorder primarily affects the immune system and platelets, causing bleeding issues but falls under hematological causes linked to blood cell dysfunction rather than a structural issue.
C: systemic lupus erythematosus Though it can cause bleeding through autoimmune mechanisms affecting blood vessels, this condition is primarily an autoimmune disease rather than a direct structural cause of bleeding.
Which of the following clinical conditions DOES NOT signify iron overload in children with β-thalassemia major?
Rationale:
D: Growth failure does not signify iron overload in children with β-thalassemia major. It is primarily related to the disease's impact on hematopoiesis and overall health, not excessive iron accumulation.
A: Heart failure results from chronic iron overload, leading to cardiac damage and dysfunction, which is a recognized complication in children with β-thalassemia major.
B: Liver cirrhosis often develops due to iron deposition in liver tissues, causing fibrosis and impaired liver function, commonly seen in patients with β-thalassemia major experiencing iron overload.
C: Bronzing of the skin is a hallmark sign of hemosiderosis, resulting from excessive iron in the body, frequently observed in children suffering from β-thalassemia major.
Which of the following is least likely to be associated with prolonged thrombocytopenia in children?
Rationale:
Prolonged thrombocytopenia in children is least likely to be associated with immune thrombocytopenia. This condition typically results in a transient decrease in platelet counts rather than a prolonged state, especially in pediatric patients.
B: systemic lupus erythematosus (SLE) This autoimmune disorder is known to cause chronic thrombocytopenia due to immune-mediated mechanisms, making it a significant concern in affected children.
C: HIV infection Chronic HIV infection can lead to various hematological abnormalities, including prolonged thrombocytopenia, due to its impact on bone marrow function and immune system disruption.
D: type 2B von Willebrand disease This genetic condition often presents with bleeding issues and can contribute to prolonged thrombocytopenia in children due to abnormal platelet function and increased destruction.
Matching: Hemolytic anemia - Decay-accelerating factor deficiency
Rationale:
Hemolytic anemia is associated with decay-accelerating factor deficiency. This condition results in excessive destruction of red blood cells, leading to anemia, which is characteristic of autoimmune hemolytic anemia where the immune system attacks red blood cells.
A: Hereditary spherocytosis involves a genetic defect in red blood cell membrane proteins, leading to spherically shaped cells, not directly linked to decay-accelerating factor deficiency.
C: Hereditary pyropoikilocytosis is a rare genetic disorder affecting red blood cell shapes and stability, but it does not involve the immune-mediated destruction characteristic of decay-accelerating factor deficiency.
D: Sickle cell anemia primarily results from abnormal hemoglobin causing red blood cell distortion and blockage of blood vessels, which is unrelated to decay-accelerating factor deficiency and its hemolytic impact.
A 9-year-old male child is about to do elective tonsillectomy; preoperative investigations are all normal except for a significant prolonged partial thromboplastin time PTT; there was no previous bleeding after circumcision and emergency appendectomy. Of the following, the MOST likely diagnosis is
Rationale:
D: Prekallikrein deficiency is the most likely diagnosis, as it specifically results in a prolonged partial thromboplastin time while not affecting bleeding tendencies, evidenced by the child's history of no bleeding events.
A: Hemophilia A typically presents with significant bleeding tendencies due to factor VIII deficiency, which does not align with the child's lack of bleeding history after surgeries.
B: Hemophilia B, caused by factor IX deficiency, also leads to bleeding issues, contradicting the child's normal postoperative bleeding experiences following circumcision and appendectomy.
C: Hemophilia C, related to factor XI deficiency, would likely present with bleeding symptoms, which are absent in this child’s medical history following surgical procedures.
A 15-year-old is diagnosed with non-Hodgkin lymphoma. Which of the following should the nurse include in teaching the parents about this lymphoma? (Select one that does not apply.)
Rationale:
Non-Hodgkin lymphoma does not involve Reed-Sternberg cells; these cells are characteristic of Hodgkin lymphoma. Therefore, stating that their presence is diagnostic for non-Hodgkin lymphoma is inaccurate and misleading.
A: The malignancy originates in the lymphoid system. This statement is accurate, as non-Hodgkin lymphoma arises from lymphatic tissues, affecting the immune system significantly.
C: Mediastinal involvement is typical. Non-Hodgkin lymphoma usually presents in peripheral lymph nodes rather than the mediastinum, making this characteristic atypical for the condition.
D: The disease is diffuse rather than nodular. Non-Hodgkin lymphoma can be diffuse; however, it can also present in nodular forms, so this statement lacks specificity and clarity.
In disseminated intravascular coagulation, which of the followings is reduced?
Rationale:
Fibrinogen is reduced in disseminated intravascular coagulation. This condition leads to widespread clotting and subsequent depletion of clotting factors, including fibrinogen, resulting in its decreased levels in the bloodstream.
A: Prothrombin time measures the time for blood to clot, which may be prolonged but does not indicate a reduction in this specific factor during disseminated intravascular coagulation.
B: Partial thromboplastin time assesses the intrinsic pathway of coagulation, which can also be prolonged without reflecting a direct decrease in the intrinsic clotting factors present in the blood.
C: D-dimer is a fibrin degradation product often elevated in disseminated intravascular coagulation due to increased clot formation and breakdown, not reduced like fibrinogen.
A child receiving a transfusion of packed red blood cells develops signs of a hemolytic reaction. Which of the following would be expected? (Select one that does not apply.)
Rationale:
A child receiving a transfusion of packed red blood cells developing signs of a hemolytic reaction would not typically present with a rash.
Fever, oliguria, and hypotension are classic manifestations of hemolytic reactions, indicating systemic responses to blood component incompatibility. A rash, however, is generally associated with allergic reactions rather than hemolysis, making it an unlikely symptom in this context.
A: Fever An elevated temperature is a common symptom of hemolytic reactions, reflecting the immune response to transfused blood cells.
C: Oliguria Reduced urine output occurs due to acute kidney injury from hemolysis, where hemoglobinuria can obstruct renal tubules.
D: Hypotension The drop in blood pressure arises from vascular collapse and fluid shifts, commonly seen during hemolytic reactions.
Indications for platelet transfusions in infants less than 4 months of age include all of the following platelet counts and clinical situations EXCEPT
Rationale:
C: <20 × 10¹/L and stable. In infants less than 4 months old, a platelet count below 20 × 10¹/L typically necessitates transfusion only when accompanied by clinical instability or active bleeding.
A: <100 × 10¹/L and bleeding. This scenario indicates an immediate need for transfusion due to the risk of significant hemorrhage, aligning with clinical guidelines for treatment.
B: <50 × 10¹/L and invasive procedure. A platelet count below 50 × 10¹/L during invasive procedures heightens bleeding risks, warranting transfusion to ensure safety during such interventions.
D: <50 × 10¹/L and immune mediated. Immune-mediated issues at this count can lead to serious complications, justifying transfusion as a preventative measure against potential bleeding events.
If the patient described in Questions 10-12 does not experience improvement in his anemia, which of the following should be explored (choose as many as are appropriate)?
Rationale:
A: Gastrointestinal blood loss should be explored as it is a common cause of anemia, potentially leading to ongoing deficiencies if not identified and treated. Detecting such loss is essential for effective management.
B: Thalassemia primarily involves genetic factors affecting hemoglobin production, making it less likely to be the cause of anemia without prior diagnosis or indications of hereditary conditions.
C: Sickle cell anemia is a hereditary disorder that usually presents with specific symptoms and is less likely to develop in an adult without previous medical history indicating its presence.
D: Urinary tract infection typically does not lead to anemia directly; it primarily causes other symptoms like pain and urgency rather than affecting red blood cell production or survival.
Which of the following drugs is least likely to cause thrombocytopenia in children?
Rationale:
B: Phenytoin is least likely to cause thrombocytopenia in children as it has a lower incidence of affecting platelet counts compared to the other listed medications, which are more frequently associated with this condition.
A: Valproic acid is known to potentially cause thrombocytopenia due to its effects on platelet production and function, making it a less favorable option for children.
C: Sulfonamides can induce thrombocytopenia as an adverse reaction, particularly in pediatric patients, thus increasing the risk of bleeding complications in this population.
D: Trimethoprim-sulfamethoxazole often leads to hematological side effects, including thrombocytopenia, which poses a significant risk for children requiring safe medication options.
Prednisone is given to children being treated for leukemia. Why is this medication included in the treatment plan?
Rationale:
Prednisone destroys abnormal lymphocytes. This action is crucial in leukemia treatment, as it effectively reduces the number of malignant cells, thereby aiding in the overall management of the disease and enhancing the efficacy of other therapies.
A: Enhances protein metabolism. While prednisone may influence metabolism, its primary role in leukemia treatment is not related to protein metabolism but rather to its action on lymphocytes.
B: Enhances sodium excretion. Prednisone does not primarily function to enhance sodium excretion in leukemia treatment; its therapeutic effects center on its capacity to target and eliminate cancerous cells.
C: Increases absorption of the chemotherapy. Prednisone does not increase chemotherapy absorption; instead, it works synergistically by directly targeting and reducing the population of abnormal lymphocytes in the body.
The LEAST helpful historical clue in Iron deficiency anemia is
Rationale:
The LEAST helpful historical clue in Iron deficiency anemia is Giardia lamblia infection.
Giardia lamblia infection is primarily associated with gastrointestinal issues and does not provide significant insight into iron deficiency anemia. The other options indicate dietary habits or patient demographics that directly relate to iron levels and absorption, making them more relevant for diagnosing this condition.
A: pica This symptom indicates a craving for non-food substances, often linked to iron deficiency, making it a relevant clue in diagnosing the condition.
B: age Age can influence nutritional status and the prevalence of iron deficiency anemia, particularly in certain populations, rendering it a useful historical clue.
C: ingestion of cow's milk Excessive cow's milk consumption, especially in infants and toddlers, can lead to iron deficiency anemia, as it displaces iron-rich foods, making this a pertinent factor.
A 5-year-old child has multiple bruises on her extremities and oral mucosal bleeding of 3 days duration; she had a mild respiratory tract infection 2 weeks before; physical examination was normal apart from multiple ecchymoses and petechiae. Of the following, the NEXT diagnostic step is
Rationale:
A complete blood count is the next diagnostic step. This test helps evaluate platelet levels, which are crucial in assessing the cause of bruising and bleeding in children, particularly in cases involving potential thrombocytopenia or clotting disorders.
B: Prothrombin time assesses the extrinsic pathway of coagulation, which may not directly address the child’s presentation of bruising and mucosal bleeding related to possible platelet issues.
C: Bleeding time evaluates the function of platelets but does not provide comprehensive information regarding platelet counts or underlying hematological conditions affecting the child.
D: Partial thromboplastin time focuses on the intrinsic pathway of coagulation and is less relevant when immediate concerns involve evaluating the child's platelet count and possible causes of bleeding.
You are explaining the risk of sepsis after splenectomy to medical students. An important statement that should be included during this discussion is that risk is especially high in children
Rationale:
Children with chronic immune thrombocytopenia (ITP) face an elevated risk of sepsis following splenectomy due to their underlying condition, which compromises immune function and increases susceptibility to infections.
A: older than 5 yr at the time of surgery. This age group does not inherently experience a heightened risk of sepsis; rather, their immune systems may be more developed compared to younger children.
B: with hereditary spherocytosis. While this condition affects the spleen, it doesn't specifically correlate with a significantly increased risk of sepsis post-splenectomy compared to children with ITP.
D: after trauma. Trauma itself does not directly influence the sepsis risk post-splenectomy; other factors, such as underlying health conditions, play a more crucial role in determining susceptibility.
Constrictive pericarditis secondary to radiation exposure with sings of increase in pulmonary pressure. The child received a course of irradiation which leads to
Rationale:
Constrictive pericarditis secondary to radiation exposure with signs of increased pulmonary pressure is a consequence of radiation exposure.
Radiation exposure leads to inflammation and fibrosis in the pericardium, resulting in constrictive pericarditis. The child’s previous irradiation contributes to the thickening and restriction of the pericardial sac, causing elevated pulmonary pressures and associated symptoms, reinforcing the link between radiation and this condition.
A: tuberculosis Tuberculosis does not typically arise from radiation exposure and would require a different pathophysiological basis involving infectious agents rather than direct tissue damage from irradiation.
C: postsurgical Postsurgical constrictive pericarditis relates to prior cardiac surgery, not radiation exposure. The child's history indicates irradiation rather than surgical intervention as the causative factor for the condition.
D: idiopathic An idiopathic cause suggests an unknown origin, which contradicts the established link between radiation exposure and the development of constrictive pericarditis observed in this child’s medical history.
A 5-year- old boy presented to the emergency department with sudden onset of skin ecchymoses and single attack of epistaxis, the history is negative for any significant event except for preceding upper respiratory tract infection. The examination showed an active healthy looking boy with diffuse skin petechial rash and ecchymoses over both lower and upper limbs, no lymphadenopathy and no organomegaly. The initial CBC is as follows: Hb 12.3 gm/dl, WBC 7.600/cmm, N 45%, L 51%, plt 17.000/cmm, and normal looking film except for rarely seen platelets. The most likely diagnosis is:
Rationale:
Immune thrombocytopenia is the most likely diagnosis. The boy's symptoms, including skin ecchymoses, petechial rash, and exceedingly low platelet count, align with immune thrombocytopenia, particularly following a viral infection, indicating a potential autoimmune response.
B: Acute leukemia presents with more severe symptoms, including significant anemia and leukocytosis, alongside other systemic findings, which are not evident in this case.
C: Aplastic anemia typically results in pancytopenia, affecting red blood cells and white blood cells, which is not supported by the normal counts observed in this patient.
D: Hemophilia A primarily causes bleeding issues due to clotting factor deficiencies, not low platelet counts, rendering this option inconsistent with the presented clinical and laboratory findings.
A 62-year-old man underwent right total knee replacement 8 days ago. Swelling has developed in his right lower extremity, and Doppler ultrasonography confirms the presence of a right superficial femoral vein thrombosis. His current medications include oxycodone and subcutaneous unfractionated heparin. Results of preoperative tests, including a complete blood cell count and liver and kidney function, were normal. Other laboratory data include the following: hemoglobin 12.2 g/dL, leukocyte count 8.5 × 10^9/L, and platelet count 60 × 10^9/L. In addition to stopping the use of subcutaneous heparin, what is the next most appropriate step in management of this patient?
Rationale:
Start direct thrombin inhibitor therapy.
Direct thrombin inhibitors are effective for managing superficial femoral vein thrombosis, particularly when heparin is contraindicated or ineffective. This patient's thrombocytopenia necessitates an alternative anticoagulation strategy to prevent further complications while ensuring safety.
A: Start low-molecular-weight heparin therapy. Low-molecular-weight heparin is not suitable due to the patient's low platelet count, which increases the risk of heparin-induced thrombocytopenia and potential complications.
B: Start intravenous therapeutic doses of heparin. Intravenous heparin poses significant risks given the patient’s thrombocytopenia, as it may exacerbate bleeding complications and is contraindicated in this context.
D: Start aspirin therapy. Aspirin lacks efficacy for treating venous thromboembolism, making it an inappropriate choice in this scenario, where stronger anticoagulation is necessary to manage the thrombosis effectively.
It is a common complication after an open heart surgery due to immunological phenomena with up to 30% of cardiac surgery. Treatment is usually with anti-inflammatory medications and colchicine.
Rationale:
Postpericardiotomy syndrome is a common complication after open heart surgery, occurring in up to 30% of cases due to immune system reactions. Treatment typically involves anti-inflammatory medications and colchicine to manage symptoms effectively.
A: pericarditis Severe inflammation of the pericardium can occur but does not specifically relate to post-surgical complications in the context of open heart surgery's immunological phenomena.
B: myocarditis This condition involves inflammation of the heart muscle itself, which is not primarily associated with surgical complications following cardiac procedures, distinguishing it from the presented syndrome.
One of the following features DOES NOT fit hemophilia A
Rationale:
Normal ristocetin-induced platelet agglutination, prolonged partial thromboplastin time, and low factor VIII activity are characteristic features of hemophilia A. Prolonged prothrombin time does not typically occur in this condition.
A: normal ristocetin-induced platelets agglutination This feature indicates normal platelet function, which aligns with hemophilia A, where platelet aggregation is generally unaffected despite the coagulation factor deficiency.
C: prolonged partial thromboplastin time This feature is a hallmark of hemophilia A due to the deficiency of factor VIII, leading to a longer time for blood to clot in this pathway.
D: low factor VIII activity Hemophilia A is specifically characterized by a deficiency in factor VIII, which causes bleeding tendencies and is a crucial aspect of the disorder's pathology.
Matching: Hemolytic anemia - Oxidant stressors
Rationale:
Matching hemolytic anemia with oxidant stressors aligns with hereditary pyropoikilocytosis, as it is characterized by red blood cells that are vulnerable to oxidative damage, leading to hemolysis under stress conditions.
A: Hereditary spherocytosis involves membrane defects, primarily leading to splenic destruction rather than direct oxidative stress, making it less relevant to the relationship with oxidant stressors.
B: Autoimmune hemolytic anemia results from antibody-mediated destruction of red blood cells, where the primary mechanism is immune-mediated rather than a direct response to oxidant stress.
D: Sickle cell anemia primarily involves abnormal hemoglobin leading to vaso-occlusive crises and hemolysis, but it does not directly correlate with the concept of oxidant stressors in the same way.
Matching: For each of the following disorders, select the appropriate platelet presentation - Wiskott-Aldrich
Rationale:
Platelets decreased in number. Wiskott-Aldrich syndrome is characterized by thrombocytopenia, which means there is a significant reduction in platelet count, leading to an increased risk of bleeding and bruising. This distinctive feature is essential for diagnosis and management of the disorder.
B: Platelet count normal. Normal platelet counts do not align with Wiskott-Aldrich syndrome, where patients typically exhibit low platelet levels, making this option incompatible with the disorder's characteristics.
C: Platelets increased. An increased platelet count contradicts the hallmark of Wiskott-Aldrich syndrome, as the condition is defined by a decrease in platelet numbers, not an elevation.
Which best describes the action of chemotherapeutic agents used in treating cancer in children?
Rationale:
D: They interrupt the cell cycle, thereby causing cell death. Chemotherapeutic agents target rapidly dividing cancer cells by disrupting their cell cycle, ultimately leading to apoptosis, which is crucial in treating pediatric cancers effectively.
A: They suppress the function of normal lymphocytes. While some chemotherapeutics may impact lymphocytes, their primary role is to target cancer cells, not to suppress normal immune function.
B: They are alkylating agents and are cell-specific. Although some chemotherapeutics are alkylating agents, not all are cell-specific, and many work by targeting multiple phases of the cell cycle.
C: They cause DNA replication and are cell-specific. Chemotherapeutic agents do not promote DNA replication; rather, they inhibit it, aiming to halt cancer cell growth and division rather than facilitating replication.
Which of the following results indicates Iron deficiency anemia?
Rationale:
High red cell distribution width indicates Iron deficiency anemia. This measure reflects the variability in red blood cell size, which often increases when iron levels are insufficient, as the body produces smaller, less uniform red blood cells in response to the deficiency.
A: high serum ferritin High serum ferritin suggests adequate or increased iron stores, contradicting the condition of Iron deficiency anemia where ferritin levels are typically low.
C: increased marrow iron Increased marrow iron suggests that there is sufficient iron available for erythropoiesis, which is not characteristic of Iron deficiency anemia, where marrow iron is often depleted.
D: raised marrow sideroblasts Raised marrow sideroblasts indicate the presence of iron in the marrow but are associated with conditions like sideroblastic anemia rather than Iron deficiency anemia, which shows reduced iron levels.
Inherited thrombocytopenias include all the following EXCEPT
Rationale:
Inherited thrombocytopenias include all the following EXCEPT Glanzmann's Thrombasthenia.
Glanzmann's Thrombasthenia is primarily an inherited platelet function disorder characterized by defective platelet aggregation, not a thrombocytopenia, distinguishing it from the other congenital conditions listed.
A: congenital Amegakaryocytic Thrombocytopenia Amegakaryocytes are absent, leading to diminished platelet production, clearly categorizing this condition as a type of inherited thrombocytopenia.
B: thrombocytopenia with Absent Radii (TAR) Syndrome This syndrome features absent radii and significant thrombocytopenia due to bone marrow failure, aligning it with inherited thrombocytopenias.
D: Bernard-Soulier Syndrome This syndrome is characterized by large platelets and a deficiency in glycoprotein Ib, resulting in a classic inherited thrombocytopenia with distinctive clinical features.
Elevated serum transferrin receptor levels signify
Rationale:
Elevated serum transferrin receptor levels signify iron deficiency. Increased transferrin receptor levels indicate that the body is attempting to acquire more iron due to insufficient availability, reflecting a state of iron deficiency anemia, which is characterized by reduced iron stores and impaired hemoglobin synthesis.
B: ferritinemia High ferritin levels typically indicate iron overload or inflammation, not a deficiency. This condition often corresponds with increased storage iron, contrasting with the low iron status associated with elevated transferrin receptors.
C: acute phase responses Acute phase responses are linked to inflammation and infection, which can alter various serum proteins. Elevated transferrin receptor levels specifically indicate iron status rather than general inflammatory responses.
D: erythrocyte marrow hypoproliferation Low erythrocyte production in the marrow may not directly correlate with transferrin receptor levels. This condition reflects a broader issue of marrow function rather than specifically indicating iron deficiency.
Which of the following agents helps in decreasing the frequency of vasoocclusive crises in children with sickle cell disease?
Rationale:
Hydroxyurea is the agent that helps in decreasing the frequency of vasoocclusive crises in children with sickle cell disease.
Hydroxyurea works by increasing fetal hemoglobin levels, which inhibits sickling of red blood cells and reduces the frequency of painful vasoocclusive crises. Its efficacy in managing sickle cell disease has been well-documented, making it a standard treatment option for pediatric patients.
A: Cyclosporine does not address the underlying issues related to sickle cell disease and is primarily used as an immunosuppressant in other conditions, not for vasoocclusive crises.
B: Azathioprine primarily functions as an immunosuppressant and lacks evidence supporting its role in reducing vasoocclusive crises associated with sickle cell disease in pediatric patients.
D: Tacrolimus, while an immunosuppressant, is not indicated for sickle cell disease management and does not have a recognized impact on the frequency of vasoocclusive crises in affected children.
A child with leukemia receiving chemotherapy is complaining of nausea. The nurse has been giving scheduled antiemetics. Which of the following should the nurse do when the child is nauseated?
Rationale:
Offering cool, clear liquids is essential for a nauseated child undergoing chemotherapy, as these fluids can help maintain hydration, soothe the stomach, and may be more palatable during episodes of nausea.
A: Encourage low-protein foods. Low-protein foods do not address the immediate discomfort of nausea and may not provide the necessary nutrients required for a child undergoing treatment.
B: Encourage low-caloric foods. Low-caloric foods fail to offer adequate energy and nourishment during a time when the child may need more calories to support their health and recovery.
C: Offer the child's favorite foods. While preferred foods can be comforting, they may not be suitable or tolerated during nausea, potentially exacerbating the child's discomfort.
Which liver protein plays a key role in iron homeostasis?
Rationale:
Hepcidin plays a key role in iron homeostasis. This liver-produced hormone regulates iron absorption and distribution, ensuring that iron levels remain balanced in the body and preventing overload or deficiency.
A: Albumin serves primarily as a transport protein for various substances in the blood, but it does not have a direct role in regulating iron levels or homeostasis.
B: Fibronectin is involved in cell adhesion and tissue repair, lacking any significant function in iron regulation or homeostatic mechanisms within the liver or elsewhere.
C: Opsonin refers to molecules that enhance the immune response by marking pathogens for destruction, and it does not participate in iron metabolism or homeostasis in the liver.
Matching: Red blood cell aplasia - X-linked recessive
Rationale:
Red blood cell aplasia is classified as X-linked recessive, which means it primarily affects males due to the inheritance pattern from the mother. This condition is distinctly different from both Diamond-Blackfan anemia and transient erythroblastopenia of childhood, which do not follow this genetic pattern.
A: Diamond-Blackfan This condition does not adhere to X-linked recessive inheritance, as it is typically autosomal dominant, involving a different genetic mechanism and presenting distinct clinical features.
B: Transient erythroblastopenia of childhood This condition arises due to temporary suppression of red blood cell production, not an X-linked recessive disorder. Its etiology is separate from the genetic implications of red blood cell aplasia.
C: Both The characterization of red blood cell aplasia as X-linked recessive does not apply to either condition. Both alternatives fall outside this genetic framework, making this option invalid.
A non-hematological cause of bleeding includes
Rationale:
D: Ehlers-Danlos syndrome is a non-hematological cause of bleeding due to its connective tissue abnormalities, which lead to fragile blood vessels and increased susceptibility to bruising and hemorrhage.
A: hepatic failure results in bleeding primarily through coagulopathy related to liver dysfunction, a hematological issue rather than a direct non-hematological cause of bleeding.
B: Wiskott-Aldrich syndrome involves immunological and hematological factors, primarily impacting platelet function, making it more of a blood disorder than a non-hematological bleeding cause.
C: systemic lupus erythematosus affects multiple organ systems and can lead to bleeding through hematological complications, such as thrombocytopenia, thus not qualifying as a non-hematological cause.
Which of the following clinical conditions DOES NOT signify iron overload in children with β-thalassemia major?
Rationale:
D: Growth failure does not indicate iron overload in children with β-thalassemia major. While it can be associated with various health issues, it does not directly result from excess iron accumulation in the body.
A: Heart failure signifies iron overload as excess iron can damage the heart muscle, leading to cardiomyopathy and compromised cardiac function, particularly in thalassemia patients.
B: Liver cirrhosis is a direct consequence of iron overload, as excessive iron deposition in the liver can lead to fibrosis and eventual liver failure in affected individuals.
C: Bronzing of the skin indicates iron overload; excessive iron deposition can cause a characteristic skin discoloration, particularly in conditions like β-thalassemia major where iron accumulation is common.
Which of the following is least likely to be associated with prolonged thrombocytopenia in children?
Rationale:
Prolonged thrombocytopenia in children is least likely associated with immune thrombocytopenia. This condition often leads to transient reductions in platelet counts rather than prolonged cases, especially in pediatric populations.
B: systemic lupus erythematosus (SLE) This autoimmune disorder frequently leads to various hematological complications, including prolonged thrombocytopenia, affecting children through immune-mediated mechanisms.
C: HIV infection Chronic HIV infection can induce prolonged thrombocytopenia via bone marrow suppression and immune system dysfunction, making it a significant concern in pediatric patients.
D: type 2B von Willebrand disease This genetic disorder is linked to dysfunctional platelets, often causing prolonged thrombocytopenia, especially in children who may experience bleeding complications.
Matching: Hemolytic anemia - Decay-accelerating factor deficiency
Rationale:
Hemolytic anemia - Decay-accelerating factor deficiency.
B: This choice accurately links hemolytic anemia with a deficiency that impairs the regulation of complement activation, leading to excessive red blood cell destruction, characteristic of autoimmune hemolytic anemia.
A: Hereditary spherocytosis involves a membrane defect causing spherical red blood cells, leading to hemolysis, but it does not connect to decay-accelerating factor deficiency.
C: Hereditary pyropoikilocytosis is associated with altered red cell morphology and thermal instability, distinct from the complement regulatory issues seen in decay-accelerating factor deficiency.
D: Sickle cell anemia results from genetic mutation affecting hemoglobin structure, causing sickling and vaso-occlusion, not related to decay-accelerating factor deficiency and its impact on hemolytic anemia.
A 9-year-old male child is about to do elective tonsillectomy; preoperative investigations are all normal except for a significant prolonged partial thromboplastin time PTT; there was no previous bleeding after circumcision and emergency appendectomy. Of the following, the MOST likely diagnosis is
Rationale:
A: prekallikrein deficiency
Prekallikrein deficiency leads to an isolated prolonged PTT without a history of bleeding episodes, which aligns with the child's normal surgical history and the significant PTT.
B: hemophilia A
Hemophilia A typically presents with significant bleeding episodes, particularly after surgeries or injuries, which is not evident in this child's medical history.
C: hemophilia B
Similar to hemophilia A, hemophilia B would manifest with bleeding complications, making it inconsistent with the child’s lack of bleeding history following previous surgical procedures.
D: hemophilia C
Hemophilia C is characterized by a mild bleeding tendency and is less likely to cause significant PTT prolongation without prior bleeding history, making it an unlikely diagnosis here.
A 15-year-old is diagnosed with non-Hodgkin lymphoma. Which of the following should the nurse include in teaching the parents about this lymphoma? (Select one that does not apply.)
Rationale:
Non-Hodgkin lymphoma does not present with Reed-Sternberg cells in biopsies; this characteristic is specifically associated with Hodgkin lymphoma, making option B the one that does not apply to non-Hodgkin lymphoma teaching.
A: The malignancy originates in the lymphoid system. Non-Hodgkin lymphoma indeed arises from lymphoid tissues, which includes lymph nodes, spleen, and bone marrow, making this a relevant teaching point.
C: Mediastinal involvement is typical. Non-Hodgkin lymphoma can affect various areas, but mediastinal involvement is not universally characteristic, thus not essential for parents to understand in this context.
D: The disease is diffuse rather than nodular. Non-Hodgkin lymphoma often presents in a diffuse pattern, differing from nodular types, and this is an important aspect of understanding the condition.
In disseminated intravascular coagulation, which of the followings is reduced?
Rationale:
Fibrinogen is reduced. In disseminated intravascular coagulation (DIC), the consumption of fibrinogen occurs as it is used up in clot formation, leading to a deficiency in this essential coagulation factor.
A: prothrombin time Prothrombin time may be prolonged due to clotting factor depletion, but it does not specifically indicate a reduction, as its alteration reflects broader coagulation pathway issues in DIC.
B: partial thromboplastin time Partial thromboplastin time can be affected in DIC, yet it does not specifically indicate a reduction. It serves to evaluate the intrinsic pathway rather than fibrinogen levels.
C: D-dimer D-dimer levels are typically elevated in DIC, reflecting increased fibrin degradation. Therefore, its presence signifies ongoing coagulation activity rather than a decrease in any coagulation factor.
A child receiving a transfusion of packed red blood cells develops signs of a hemolytic reaction. Which of the following would be expected? (Select one that does not apply.)
Rationale:
A child receiving a transfusion of packed red blood cells developing signs of a hemolytic reaction would not typically present with a rash.
Fever occurs as the body reacts to foreign antigens, indicating an immune response. Oliguria signifies reduced urine output, commonly linked to kidney damage during hemolysis. Hypotension may arise from shock or fluid loss, a serious consequence of the hemolytic process.