Which is the best means for diagnosis of myasthenia gravis?
Rationale:
Anti-ACh antibodies are the best means for diagnosis of myasthenia gravis.
Myasthenia gravis is an autoimmune disorder characterized by antibodies attacking acetylcholine receptors at the neuromuscular junction. Detecting these anti-ACh receptor antibodies in the blood is the most specific and sensitive diagnostic test. Elevated levels confirm the autoimmune pathogenesis, providing a definitive diagnosis for most patients presenting with fluctuating muscle weakness and fatigability, making it the primary diagnostic approach.
B: Nerve conduction velocity (NCV) studies These studies primarily assess peripheral nerve function and myelin integrity, which are typically normal in myasthenia gravis, as the pathology lies at the neuromuscular junction, not the nerve itself.
C: Electromyogram (EMG) While EMG can show characteristic decremental responses with repetitive nerve stimulation in myasthenia gravis, it is a functional test and less specific than direct antibody detection for establishing the underlying autoimmune etiology.
D: Nerve biopsy This invasive procedure is generally reserved for diagnosing neuropathies affecting nerve structure directly, like demyelinating conditions or vasculitis. Myasthenia gravis is a functional disorder of the neuromuscular junction, not a structural nerve disease.
Torticollis, literally meaning twisted neck, is not a diagnosis but rather a manifestation of a variety of underlying conditions. All the following conditions may cause torticollis EXCEPT
Rationale:
Upper lobe pneumonia is the condition that does NOT typically cause torticollis.
Upper lobe pneumonia primarily affects lung tissue, causing respiratory symptoms like cough, fever, and chest pain. While severe pulmonary conditions can sometimes induce referred pain or muscle guarding, pneumonia's direct physiological mechanism does not typically result in the sustained, abnormal neck posturing characteristic of torticollis. Its impact is centered on the respiratory system, not the musculoskeletal or neurological structures governing neck position.
A: positional deformation Infantile torticollis frequently arises from sustained abnormal fetal positioning or postnatal sleeping habits, leading to muscular
More than 40% of total body sodium is in the
Rationale:
More than 40% of total body sodium is in the bone.
Bone serves as a significant reservoir for sodium within the body, storing a substantial portion of total body sodium, often exceeding 40%. This sodium is primarily bound within the bone matrix, not readily exchangeable with extracellular fluid. It functions as a long-term buffer system, potentially releasing sodium into circulation during periods of severe depletion, highlighting its crucial, often overlooked, physiological role beyond structural support.
A: intravascular spaces Intravascular spaces contain only a small fraction of total body sodium, primarily contributing to plasma osmolarity and fluid balance within the circulatory system, not a major reservoir.
B: interstitial spaces Interstitial spaces hold a significant amount of sodium as part of the extracellular fluid, influencing tissue fluid dynamics, but represent a smaller overall percentage than bone's stored quantity.
C: intracellular fluid Intracellular fluid maintains a very low sodium concentration due to active transport mechanisms, making it an insignificant compartment for total body sodium storage or distribution.
Myasthenia gravis is a chronic autoimmune disease of neuromuscular blockade. Of the following, the MOST characteristic feature is
Rationale:
Fatigue is the MOST characteristic feature of Myasthenia gravis.
Myasthenia gravis is an autoimmune condition causing fluctuating skeletal muscle weakness that worsens with sustained activity and improves with rest. This progressive weakening of voluntary muscles throughout the day, particularly impacting ocular, bulbar, and limb muscles, manifests predominantly as profound and debilitating fatigue. The hallmark fatigability is central to its diagnosis and patient experience, reflecting impaired neuromuscular transmission.
B: myalgia Myalgia, or muscle pain, is not a typical or primary symptom associated with myasthenia gravis. Patients primarily experience painless muscle weakness and fatigability rather than discomfort from the muscles themselves.
C: fasciculation Fasciculations, involuntary muscle twitching, are indicative of lower motor neuron disorders or denervation, not characteristic of the impaired neuromuscular junction transmission seen in myasthenia gravis.
D: abnormal pupillary response Pupillary responses are almost universally spared in myasthenia gravis, as the disease primarily affects voluntary skeletal muscles, not the smooth muscles of the iris controlling pupil size.
Matching: Congenital vertical talus
Rationale:
Soft tissue surgical release required.
Congenital vertical talus is a rigid foot deformity where the navicular bone dislocates dorsally on the talar head, creating a "rocker-bottom" foot. This complex malformation involves severe soft tissue contractures, including the ankle capsule and Achilles tendon. Surgical intervention, primarily extensive soft tissue release and K-wire fixation, is almost always required to achieve anatomical alignment and functional correction. Non-operative
The MOST common cause of in-toeing in children 2 years or older is
Rationale:
Internal femoral torsion is the MOST common cause of in-toeing in children 2 years or older.
Internal femoral torsion, also known as femoral anteversion, is prevalent in children over two years old. This condition involves an inward twisting of the femur, causing the kneecaps and feet to point inward during walking. It typically presents between ages 4-6 and often resolves spontaneously by age 8-10. This rotational deformity is the leading etiology for persistent in-toeing in this age group.
B: internal tibial torsion This condition primarily affects toddlers and resolves spontaneously by 2-3 years, making it less common than femoral torsion in children 2 years or older.
C: metatarsus adductus Metatarsus adductus is a forefoot deformity present at birth, typically resolving or requiring treatment much earlier than the 2-year-old age group.
D: talipes equinovarus (clubfoot) Talipes equinovarus is a complex congenital foot deformity diagnosed at
A 17-year-old adolescent is found to have a leg length discrepancy of 1 cm, which is confirmed by radiographic evaluation. There is no limp. Which is the recommended treatment?
Rationale:
No treatment is indicated for a 1 cm leg length discrepancy in a 17-year-old without a limp.
A 1 cm leg length discrepancy is generally considered physiological and well-tolerated, especially without associated symptoms like a limp or pain. For a 17-year-old, growth plates are nearing closure, so the discrepancy is unlikely to worsen significantly. Conservative management without intervention is appropriate as this minor difference typically causes no functional impairment or long-term issues. Clinical observation suffices.
B: Heel lift for the shortened leg A 1 cm discrepancy typically does not warrant a heel lift, particularly in an asymptomatic individual. Orthotic interventions are usually reserved for larger differences or symptomatic LLDs, as minor
It is important to inform families of children with in-toeing due to femoral anteversion and internal tibial torsion that it can take until
Rationale:
It can take until 7 to 8 years of age for correction.
In-toeing caused by femoral anteversion and internal tibial torsion often resolves spontaneously as a child grows. Peak correction for these rotational deformities typically occurs by 7 to 8 years of age. This developmental timeline reflects the natural remodeling of bone and soft tissues, which gradually aligns the lower extremities. Parents should be reassured that surgical intervention is rarely needed given this common trajectory.
A: 3 to 4 years of age for correction
Correction by 3 to 4 years is often too early for full resolution of significant femoral anteversion or internal tibial torsion. While some improvement may begin, complete alignment typically requires more time for natural skeletal development.
B: 5 to 6 years of age for correction
While substantial improvement in in-toeing is often observed by 5 to 6 years, full spontaneous resolution, especially for moderate cases of femoral anteversion or internal tibial torsion, frequently extends beyond this age range.
D: 9 to 10 years of age for correction
Correction rarely extends to 9 to 10 years for typical developmental in-toeing. By this age, if significant in-toeing persists, it might indicate a more severe or atypical presentation, potentially warranting further orthopedic evaluation.
A 4-year-old child with a history of poor sucking and swallowing as an infant recently experienced excessive sweating and blotchy erythema, especially when excited. Walking is clumsy. There has been new onset of episodes of cyclic vomiting lasting 24-27 hours, with retching and vomiting every 15-20 minutes with profuse sweating, blotchy erythema, apprehension, and irritability. Which is the most likely diagnosis?
Rationale:
Familial dysautonomia (Riley-Day syndrome) is the most likely diagnosis.
This diagnosis aligns perfectly with the described autonomic dysfunction. The history of poor sucking, swallowing, clumsy gait, excessive sweating, blotchy erythema, and cyclical vomiting episodes with profuse sweating, apprehension, and irritability are classic features of Riley-Day syndrome. These symptoms reflect severe generalized dysfunction of the autonomic and sensory nervous systems, characteristic of this genetic disorder.
A: Duchenne muscular dystrophy primarily presents with progressive muscle weakness and wasting, not the prominent autonomic symptoms like excessive sweating, cyclic vomiting, or feeding difficulties seen in this child's presentation.
B: Fabry disease involves neuropathic pain, angiokeratomas, and renal/cardiac issues, typically manifesting later. It does not
A 6-year-old child presented with acute onset of pain in the groin and anterior thigh, he gives history of an upper respiratory tract infection in the preceding 10 days. The patient is afebrile, walks with a painful limp, and has normal white blood cell count, C-reactive protein, and erythrocyte sedimentation rate. Of the following, the MOST likely diagnosis is
Rationale:
Transient synovitis is the MOST likely diagnosis.
This presentation strongly suggests transient synovitis, a common self-limiting condition in young children following a viral illness. The acute onset of pain, painful limp, and recent upper respiratory tract infection history are classic. Crucially, the absence of fever and normal inflammatory markers (WBC, CRP, ESR) rule out more severe infectious processes, fitting perfectly with the benign nature of transient synovitis.
A: septic arthritis This would present with fever, significantly elevated inflammatory markers (WBC, CRP, ESR), and severe pain preventing weight-bearing, none of which are present in this afebrile child with normal lab results.
B: osteomyelitis This bone infection typically involves fever, localized tenderness, and marked elevation of inflammatory markers, which contradict the patient's afebrile state and normal white blood cell count, C-reactive protein, and erythrocyte sedimentation rate.
C: myositis Muscle inflammation, while causing pain, typically doesn't cause a painful limp this pronounced and wouldn't be associated with a recent URI in this manner, nor would it explain the joint-centric groin pain.
Matching: Bone and joint orthopedic terminology - Arthrotomy
Rationale:
Incision into a joint is the definition of arthrotomy.
Arthrotomy is a surgical procedure involving an incision into a joint. The term combines "arthro-", meaning joint, with "-tomy", meaning to cut or make an incision. This procedure allows for direct visualization and treatment of internal joint structures, often performed for diagnostic purposes, tissue repair, or foreign body removal within the articular capsule. It's fundamental in orthopedic surgery.
A: Varum This term describes an angular deformity where a distal segment points inward toward the midline, like a bowleg, not a surgical incision.
B: Cavus This refers to an abnormally high arch in the foot, a specific anatomical foot deformity, unrelated to joint surgical entry.
C: Valgum This describes an angular deformity where a distal segment points outward away from the midline, such as a knock-knee, not an operative cut.
In Guillain-Barré syndrome, respiratory effort must be monitored to prevent respiratory failure and respiratory arrest. Of the following, the MOST recognized sign of impending respiratory failure is
Rationale:
Of the following, the MOST recognized sign of impending respiratory failure is tachypnea.
Tachypnea, an increased respiratory rate, is the primary early indicator of impending respiratory failure in Guillain-Barré syndrome. As diaphragmatic and intercostal muscle weakness progresses, the body compensates by breathing faster to maintain adequate gas exchange. This compensatory mechanism signifies the respiratory system is struggling, necessitating vigilant monitoring and intervention to avert complete arrest.
A: dysphagia Dysphagia indicates bulbar muscle weakness and aspiration risk, but it does not directly reflect the efficiency of gas exchange or the immediate impending failure of pulmonary mechanics.
C: tachycardia Tachycardia is a non-specific compensatory response to various stressors, including hypoxemia, but it is not the most direct or earliest sign specifically indicating the onset of respiratory muscle fatigue and failure.
D: altered sensorium Altered sensorium, such as confusion or lethargy, is a late sign of hypoxemia or hypercapnia, indicating significant and prolonged respiratory compromise rather than an early warning of impending failure.
A one-day-old newborn born to a myasthenic mother has generalized hypotonia and weakness. What is the prognosis?
Rationale:
No increased risk of myasthenia gravis.
The newborn's symptoms (generalized hypotonia, weakness) are indicative of transient neonatal myasthenia, caused by transplacental passage of maternal acetylcholine receptor antibodies. These antibodies degrade over weeks to months, leading to spontaneous resolution of symptoms. The condition is self-limiting and does not predispose the infant to developing juvenile or adult-onset myasthenia gravis later in life.
A: Greatly increased risk of the complete picture of myasthenia gravis. Transient neonatal myasthenia stems from temporary maternal antibody transfer, not intrinsic susceptibility. The infant's developing immune system is not permanently altered, precluding a substantial future disease risk.
B: Small but increased risk of the complete picture of myasthenia gravis. This condition is entirely distinct from true myasthenia gravis development. The presence of transient maternal antibodies does not confer even a minor, long-term susceptibility to the autoimmune disorder.
D: Some residual weakness until puberty but no increased risk of myasthenia gravis. Neonatal myasthenia is transient, with symptoms typically resolving within weeks to a few months as maternal antibodies clear. Prolonged weakness extending until puberty is not characteristic of this self-limiting condition.
Calcium intake can come from a variety of sources, with dairy products providing the most common and concentrated source. The calcium equivalent of 1 cup of milk (about 300 mg of calcium) is
Rationale:
1.5 oz of cheddar cheese is the calcium equivalent of 1 cup of milk.
Cheddar cheese is a concentrated dairy source of calcium. One and a half ounces of cheddar cheese typically
Respiratory acidosis occurs in
Rationale:
Respiratory acidosis occurs in hypotension.
Respiratory acidosis is characterized by CO2 retention due to hypoventilation. Severe hypotension, particularly in shock states, can significantly impair tissue perfusion, including the brain's respiratory centers, or necessitate heavy sedation and mechanical ventilation settings that lead to inadequate CO2 expulsion. This reduced ventilatory effort or compromised gas exchange directly results in an accumulation of carbon dioxide in the blood, driving pH down.
A: severe anemia
Severe anemia impairs oxygen transport but does not directly cause CO2 retention or hypoventilation; it typically leads to increased respiratory rate to compensate for hypoxia, not acidosis.
B: carbon monoxide poisoning
Carbon monoxide poisoning causes cellular hypoxia by binding to hemoglobin, reducing oxygen delivery. It does not directly impede CO2 elimination or cause hypoventilation, leading instead to metabolic acidosis from tissue ischemia.
C:
Charcot-Marie-Tooth disease, the most common genetically determined neuropathy. Of the following, the MOST severely affected nerve is
Rationale:
The peroneal nerve is the MOST severely affected nerve in Charcot-Marie-Tooth disease.
CMT preferentially targets longer peripheral nerves, leading to distal weakness and sensory loss. The peroneal nerve, innervating muscles in the lower leg and foot, is particularly vulnerable due to its length and superficial course. Its damage results in characteristic foot drop, high-arched feet, and hammer toes, representing hallmark clinical manifestations of the disease.
A: radial The radial nerve primarily serves the upper limb, and while CMT can cause some upper extremity involvement, it typically manifests much later and less severely than lower limb deficits.
B: facial The facial nerve governs facial expressions, and its significant involvement is not a primary or characteristic feature of typical CMT presentations, which predominantly affect limb innervation.
C: femoral The femoral nerve innervates anterior thigh muscles, but CMT's primary impact is distal. While some proximal weakness can occur, it is less pronounced and later-onset compared to the profound peroneal nerve dysfunction.
Ultrasound is used for initial evaluation of infants with DDH. To avoid confusion with physiologic laxity, ultrasound should be obtained after the of age
Rationale:
Ultrasound should be obtained after the 6 weeks of age.
Delaying ultrasound until 6 weeks of age is crucial because it allows time for the common physiologic laxity present in newborns to resolve
Which is the earliest and most consistent sign of myasthenia gravis?
Rationale:
Ptosis and extraocular muscle weakness is the earliest and most consistent sign of myasthenia gravis.
Myasthenia gravis characteristically manifests initially with ocular symptoms due to the high metabolic demand and fatigue susceptibility of these muscles. Ptosis, a drooping eyelid, and diplopia from extraocular muscle weakness are frequently the first noticeable indicators, presenting in over half of all patients. This early involvement often precedes generalized weakness, making it a hallmark for initial diagnosis and clinical presentation. The fluctuating nature of these symptoms further emphasizes their diagnostic significance in myasthenia gravis.
A: Positive Gower sign A positive Gower sign indicates proximal muscle weakness, typically seen in muscular dystrophies like Duchenne's, not an initial or consistent feature of myasthenia gravis.
B: Trendelenburg gait Trendelenburg gait points to weakness of the hip abductor muscles, often from gluteus medius dysfunction, which is not an early or
An adolescent female who is a cheerleader comes to you with a painful bump below her right knee. She denies fever or trauma. Which is the most likely diagnosis?
Rationale:
Osgood-Schlatter disease is the most likely diagnosis.
Osgood-Schlatter disease commonly affects active adolescents, like cheerleaders, due to repetitive stress on the patellar tendon where it attaches to the tibial tuberosity. This overuse injury leads to inflammation and characteristic apophysitis, manifesting as a painful, palpable bump just below the knee. The patient's age, activity level, and localized symptoms, without fever or acute trauma, align perfectly with this diagnosis.
A: Legg-Calvé-Perthes disease typically affects the hip joint in younger children, involving avascular necrosis of the femoral head. Its presentation of hip pain and limp completely differs from a painful knee bump.
B: Osteoid osteoma is a benign bone tumor known for
Matching: Bone and joint orthopedic terminology - Angulation of the vertex of bone or joint toward midline
Rationale:
Valgum describes an angulation of the vertex of a bone or joint toward the midline.
Valgum specifically refers to a deformity where the distal segment of a bone or joint deviates laterally, causing the apex or vertex of the angle to point medially, towards the body's midline. This term is commonly used for conditions like genu valgum (knock-knees), where the knees angle inward, bringing them closer to the midline, illustrating this specific angulation pattern effectively.
A: Varum Varum indicates an angulation where the distal segment deviates medially, causing the apex of the angle to point laterally, away from the midline, precisely opposite to the described condition.
B: Cavus Cavus describes an abnormally high arch, typically referring to the foot, where the sole is excessively concave. This term relates to foot morphology, not general bone or joint angulation.
D: Equinus Equinus refers to a deformity where the foot is fixed in plantarflexion, resembling a horse's hoof. This specific ankle position does not describe a general angulation of a vertex toward the midline.
Contraction alkalosis occurs in
Rationale:
Contraction alkalosis occurs in diuretic use.
Diuretic use, particularly loop and thiazide diuretics, causes volume depletion, which stimulates the renin-angiotensin-aldosterone system. This leads to increased renal hydrogen ion excretion and bicarbonate reabsorption, concentrating existing bicarbonate in a smaller extracellular fluid volume. This process elevates plasma bicarbonate levels, resulting in a metabolic alkalosis characterized by reduced fluid volume, thus termed contraction alkalosis.
A: metformin Metformin can induce lactic acidosis, a metabolic acidosis, by impairing hepatic gluconeogenesis and lactate clearance, directly opposite to the alkalotic state.
C: propofol Propofol, an anesthetic, can cause propofol infusion syndrome, leading to metabolic acidosis, not alkalosis, due to impaired mitochondrial fatty acid oxidation.
D: toluene Toluene inhalation can cause distal renal tubular acidosis, a non-anion gap metabolic acidosis, due to impaired urinary acidification, contrasting with alkalosis.
Which is not true of muscular dystrophies?
Rationale:
Degeneration and death of muscle fibers occur at some stage of disease is not true of muscular dystrophies.
Muscular dystrophies are defined by progressive and ongoing degeneration and
The MOST common location of spondylolisthesis is
Rationale:
The MOST common location of spondylolisthesis is L5 on S1.
Spondylolisthesis, particularly the isthmic type, most frequently occurs at the L5-S1 junction due to the unique anatomical stresses and biomechanical forces acting on the lumbar spine. The pars interarticularis of L5 is particularly susceptible to repetitive stress fractures, leading to anterior slippage of L5 over the sacrum. This segment bears the greatest load and experiences significant shear forces, predisposing it to displacement.
A: L2 on L3 This segment is less commonly affected by spondylolisthesis because the vertebral bodies above it absorb much of the axial load, reducing shear stress on the L2-L3 pars interarticularis.
B: L3 on L4 While possible, L3-L4 spondylolisthesis is considerably less prevalent than at the lower lumbar levels. The anatomical configuration and biomechanical demands at this segment offer greater inherent stability.
C: L4 on L5 Spondylolisthesis at L4-L5 is the second most common site, but it does not surpass the incidence observed at the lumbosacral junction. This segment experiences significant load, yet L5-S1 remains paramount.
Hyponatremia with high osmolality occurs in
Rationale:
Hyponatremia with high osmolality occurs in hyperglycemia.
Hyperglycemia causes an osmotic shift of water from the intracellular to the extracellular compartment, diluting serum sodium. Despite the low sodium concentration, the high glucose levels significantly increase plasma osmolality. This scenario presents as dilutional hyponatremia with elevated effective osmolality, distinguishing it from other hyponatremic states.
B: SIADH In SIADH, excessive ADH secretion leads to water retention and dilutional hyponatremia. However, the osmolality is typically
The term congenital muscular dystrophy is misleading because all muscular dystrophies are genetically determined. A distinguishing feature of the congenital dystrophies from other muscular dystrophies, is a high association with malformations of
Rationale:
Congenital muscular dystrophies are highly associated with malformations of the brain.
Congenital muscular dystrophies (CMDs) are a distinct group of genetic muscle disorders. Unlike other muscular dystrophies primarily affecting skeletal muscle, CMDs frequently involve the central nervous system. This high incidence of brain malformations, including structural abnormalities like lissencephaly or cerebellar hypoplasia, is a key distinguishing characteristic, often leading to significant developmental delays and cognitive impairments alongside muscle weakness, setting them apart from other dystrophies.
A: liver While some genetic conditions impact the liver, congenital muscular dystrophies are not typically distinguished by a high association with liver malformations. Liver issues are not a primary distinguishing feature for CMDs.
B: lung Respiratory complications, including muscle weakness affecting breathing, are common in advanced muscular dystrophies, but structural lung malformations are not a distinguishing characteristic of congenital types.
D: bone Muscular dystrophies can lead to secondary bone issues like scoliosis or contractures due to muscle weakness, but primary bone malformations are not a hallmark distinguishing congenital muscular dystrophies.
Toddler fractures occur in young ambulatory children. The age range for this fracture is typically around 1-4 yr. All the following statement are true EXCEPT
Rationale:
Fracture is treated with bed rest and analgesia for approximately 2 wk.
Toddler fractures are typically managed with immobilization, often using a short leg cast or splint, rather than mere bed rest. While analgesia is important
Common fracture patterns that should increase the index of suspicion of child abuse include all the following EXCEPT
Rationale:
Toddler's fracture does not typically raise suspicion of child abuse.
Toddler's fractures are common accidental injuries in young children learning to walk, usually resulting from low-energy trauma. Unlike other patterns, they lack specific indicators of abuse, such as multiple healing stages or suspicious histories. Hence, their presence alone does not warrant heightened concern for maltreatment in the absence of other signs.
A: Multiple fractures in different stages of radiographic healing indicate repetitive injury over time, strongly suggesting non-accidental trauma rather than accidental fractures.
B: Metaphyseal corner fractures are highly specific for abuse due to the mechanism involving forced pulling or twisting, rarely seen in accidental injuries.
C: Fractures too severe for the history reveal inconsistencies between injury severity and reported cause, a red flag for potential child maltreatment.
Clinical manifestations of hypermagnesemia include all the following EXCEPT
Rationale:
Hypertension is not a clinical manifestation of hypermagnesemia.
Hypermagnesemia typically causes vasodilation and subsequent hypotension due to magnesium's calcium channel blocking effects on vascular smooth muscle. Elevated magnesium levels relax blood vessels, decreasing peripheral vascular resistance and lowering blood pressure. Therefore, hypertension is an atypical and contradictory finding in severe magnesium excess, which instead often presents with diminished cardiac contractility and systemic vasodilation.
A: hypotonia Magnesium acts as a central nervous system depressant, inhibiting acetylcholine release at the neuromuscular junction, leading to reduced muscle tone and weakness.
B: hyporeflexia Excess magnesium depresses nerve impulse transmission and muscle excitability, diminishing deep tendon reflexes as a hallmark sign of magnesium toxicity.
C: sleepiness Hypermagnesemia profoundly depresses the central nervous system, causing sedation, lethargy, and drowsiness as magnesium crosses the blood-brain barrier.
In-toeing gait most commonly results from excessive femoral anteversion. Of the following, the TRUE statements is
Rationale:
Treatment is predominantly observation.
In-toeing gait, often due to excessive femoral anteversion, typically resolves spontaneously with growth. Surgical intervention is rarely required, reserved for severe, persistent cases causing functional impairment in older children. Therefore, conservative management through watchful waiting is the standard approach, allowing natural remodeling to correct the alignment over time. This non-invasive strategy prioritizes the body's intrinsic ability to rectify the condition without active intervention.
A: it is more common in boys than girls (2:1) This statement is inaccurate; in-toeing due to femoral anteversion demonstrates a higher prevalence in girls, not boys. The observed gender distribution contradicts the 2:1 male predominance suggested, making this assertion factually incorrect regarding epidemiological patterns.
B: patellas are pointing outward when the foot is straight Excessive femoral anteversion causes internal rotation of the femur, making patellas appear to point inward, often termed "kissing patellas," when the feet are aligned forward. Outward pointing patellas would signify an external rotational deformity, not anteversion.
C: diagnosis is made by CT Diagnosis of in-toeing from femoral anteversion is primarily clinical, relying on physical examination and gait observation. While CT can quantify anteversion, its routine use is discouraged due to radiation exposure, reserving it for complex or
Which of the following findings is considered abnormal on urinalysis of a patient with dehydration?
Rationale:
Granular casts are considered an abnormal finding on urinalysis of a patient with dehydration.
Granular casts signify renal tubular injury or necrosis, indicating a more severe pathological process beyond simple fluid deficit. While dehydration can concentrate urine, the presence of these casts suggests damage to the nephrons, often associated with acute kidney injury. Their appearance necessitates further investigation into kidney function and potential underlying disease rather than solely focusing on hydration status.
A: hyaline casts Hyaline casts are typically normal findings, especially in concentrated urine due to dehydration or strenuous exercise. Their presence alone does not indicate renal pathology or significant kidney damage.
C: few white blood cells A small number of white blood cells can be a normal variant in urine or indicate minor, non