Which drug is not well known to cause hyponatremia?
Rationale:
Roxithromycin is not well known to cause hyponatremia. Roxithromycin, a macrolide antibiotic, lacks significant association with hyponatremia unlike other drugs; it primarily targets bacterial protein synthesis without notable effects on sodium balance or antidiuretic hormone secretion, making it an unlikely trigger for this electrolyte disturbance in clinical practice.
A: Sertraline frequently induces hyponatremia through syndrome of inappropriate antidiuretic hormone secretion (SIADH), commonly reported in selective serotonin reuptake inhibitors affecting water and sodium homeostasis.
B: Amitriptyline can cause hyponatremia by stimulating ADH release and altering renal water handling, typical of tricyclic antidepressants impacting electrolyte regulation.
C: Ecstasy is linked to hyponatremia because it promotes excessive water intake and ADH secretion, leading to water intoxication and sodium dilution in users.
The hormone vasopressin
Rationale:
Vasopressin stimulates the kidneys to conserve water. This hormone, released by the posterior pituitary in response to increased blood osmolarity, increases water reabsorption in kidney tubules, reducing urine volume and maintaining body fluid balance. It primarily acts on collecting ducts, enhancing water permeability to prevent dehydration and stabilize blood pressure by conserving water rather than electrolytes.
A: Is secreted by the anterior pituitary gland in response to changes in blood osmolarity. Vasopressin is secreted by the posterior, not anterior, pituitary gland, making this distinction critical for understanding its physiological origin and hormonal regulation.
B: Stimulates the kidneys to retain sodium ions. Vasopressin primarily influences water retention, not sodium retention, which is regulated predominantly by aldosterone, highlighting the hormone's specific effect on water balance rather than electrolyte conservation.
D: Stimulates the kidneys to produce a large volume of urine. Vasopressin decreases urine volume by promoting water reabsorption, contrary to increasing urine production, which would lead to dehydration and disrupt fluid homeostasis.
The patient is admitted with complaints of general malaise and fatigue, along with a decreased urinary output. The patient's urinalysis shows coarse, muddy brown granular casts and hematuria. The nurse determines that the patient has:
Rationale:
The patient has intrarenal disease, probably acute tubular necrosis. This diagnosis is supported by the presence of coarse, muddy brown granular casts and hematuria in the urinalysis, which are characteristic of tubular damage. The symptoms of general malaise, fatigue, and decreased urinary output further indicate intrinsic renal injury rather than prerenal or postrenal causes.
A: Acute kidney injury from a prerenal condition usually presents with concentrated urine and hyaline casts, not muddy brown casts, indicating decreased perfusion rather than tubular cell damage.
B: Acute kidney injury from postrenal obstruction typically causes urinary retention and hydronephrosis, without muddy brown granular casts seen in this case.
D: A urinary tract infection primarily shows pyuria and bacteriuria, not muddy brown granular casts or hematuria indicative of tubular necrosis.
Respiratory acidosis is caused by which of the following?
Rationale:
Respiratory acidosis is caused by hypoventilation.
Hypoventilation reduces the rate and depth of breathing, leading to inadequate carbon dioxide expulsion. This accumulation of CO2 in the blood increases acidity, lowering pH levels and causing respiratory acidosis. It directly impairs gas exchange, distinguishing it from metabolic causes and resulting in an acid-base imbalance driven by respiratory dysfunction.
B: Hyperventilation causes excessive CO2 expulsion, leading to respiratory alkalosis, the opposite of acidosis. It reduces blood carbon dioxide levels, increasing pH rather than decreasing it.
C: Diarrhea causes metabolic acidosis through loss of bicarbonate ions but does not affect CO2 retention or respiratory function.
D: Excessive vomiting leads to metabolic alkalosis by losing stomach acid, thus increasing blood pH and not causing respiratory acidosis.
Prolonged vomiting of the stomach's contents can result in
Rationale:
Prolonged vomiting of the stomach's contents can result in metabolic alkalosis. Vomiting causes loss of gastric acid (hydrochloric acid), which reduces hydrogen ion concentration in the body. This decrease in acidity leads to an elevated blood pH, causing metabolic alkalosis. The body’s compensatory mechanisms may struggle to restore acid-base balance during extended vomiting episodes, reinforcing alkalosis development.
A: respiratory acidosis involves increased carbon dioxide retention in the lungs, unrelated to acid loss from vomiting, thus it does not fit the condition caused by gastric content expulsion.
B: respiratory alkalosis results from excessive carbon dioxide exhalation, typically due to hyperventilation, which differs from metabolic disturbances caused by vomiting.
C: metabolic acidosis is characterized by excess acid accumulation or bicarbonate loss, opposing the alkalosis caused by loss of stomach acid during vomiting.
A nurse monitoring the intake and output of fluids for a patient with severe diarrhea knows that normally how many mL of body fluids is lost via the gastrointestinal tract?
Rationale:
Normally, about 300 mL of body fluids is lost via the gastrointestinal tract. This minimal loss reflects typical digestive secretions and absorptions, maintaining fluid balance in healthy individuals. Severe diarrhea significantly increases this volume, but under normal conditions, fluid loss through the GI tract remains low, supporting homeostasis without causing dehydration or electrolyte imbalances in the body.
B: 1,000 mL overestimates normal gastrointestinal fluid loss, which is typically much lower; this volume relates more to pathological states rather than baseline physiology, making it an inaccurate representation of normal fluid loss.
C: 1,300 mL greatly exaggerates typical daily gastrointestinal fluid loss, which is minimal under normal circumstances. Such a high amount would suggest abnormal conditions rather than standard homeostatic fluid regulation.
D: 2,600 mL is an excessive figure for standard gastrointestinal fluid loss, aligning more with severe dehydration scenarios than with typical, healthy fluid turnover in the digestive system.
On average, how much of the body is composed of water?
Rationale:
The average human body is composed of approximately 60 percent water. This proportion reflects the essential role water plays in physiological processes such as temperature regulation, nutrient transport, and cellular function. Water constitutes the majority of body fluids, including blood and intracellular fluid, making 60 percent a scientifically supported average value across diverse populations and age groups.
A: 10 percent represents a drastically underestimated figure far below actual human hydration levels, ignoring the substantial water content vital for survival and bodily functions.
B: 20 percent significantly understates the true water composition, failing to account for the extensive presence of water within cells and extracellular compartments.
C: 40 percent underrepresents the body's water content, neglecting the integral role of water in maintaining homeostasis and supporting metabolic activities at a higher scale.
The most common cause of acute kidney injury in critically ill patients is
Rationale:
Sepsis is the most common cause of acute kidney injury in critically ill patients. Sepsis triggers systemic inflammatory responses that cause renal hypoperfusion, endothelial damage, and tubular injury, leading to impaired kidney function. The combination of infection, hypotension, and immune dysregulation makes sepsis the predominant factor responsible for acute kidney injury in critical care settings.
B: Fluid overload contributes to kidney stress but primarily exacerbates existing dysfunction rather than inducing acute kidney injury directly, making it a secondary rather than primary cause in critically ill patients.
C: Medications can cause nephrotoxicity but are less frequently the initial cause of acute kidney injury compared to systemic conditions like sepsis, which more directly impair renal perfusion and function.
D: Hemodynamic instability leads to reduced renal blood flow but is often a consequence of sepsis rather than an independent primary cause, making it less commonly the direct trigger of acute kidney injury.
Polyuria means
Rationale:
Polyuria means excess urine output. Polyuria specifically refers to the production of abnormally large volumes of dilute urine, often seen in conditions like diabetes mellitus or diabetes insipidus. It indicates an increased urine flow rather than changes in urine composition or blood chemistry, distinguishing it clearly from other urinary or renal-related terms.
A: glucose in the urine refers to glycosuria, which involves sugar presence, not urine volume.
B: inadequate urine output describes oliguria, indicating reduced urine flow, opposite of polyuria’s excessive output.
D: excess urea in the blood is termed uremia, relating to blood chemistry, not urine volume or flow.
A patient asks a nurse if it is possible to contract a disease by donating blood. How would the nurse respond?
Rationale:
There is no way you can contract a disease by giving blood. This statement is accurate because the blood donation process uses sterile, single-use equipment and strict protocols to prevent any transmission of infections to the donor. The safety measures ensure that donating blood does not expose individuals to bloodborne diseases or other infectious agents during the procedure.
A: There is only a very small chance; I know you will be safe. This option implies some risk exists, which is misleading since the process is designed to eliminate any possibility of disease transmission to the donor during blood donation.
B: Although hepatitis is possible, AIDS is not. This option falsely suggests that some diseases could be contracted during donation, which contradicts the established sterile procedures preventing any disease transmission to donors.
C: If I were you, I would request special handling of my blood. This advice is irrelevant to donor safety and misunderstands the question, as special handling does not prevent disease contraction during the act of donating blood.
A person who suffers from emphysema will exhibit signs of
Rationale:
A person who suffers from emphysema will exhibit signs of respiratory acidosis. Emphysema damages alveoli, impairing gas exchange and causing CO2 retention, which lowers blood pH. This respiratory impairment leads to an accumulation of carbon dioxide, resulting in respiratory acidosis. The body's compensatory mechanisms may attempt to balance pH, but the primary disturbance remains respiratory in origin due to compromised ventilation.
B: Respiratory alkalosis involves excessive CO2 loss, unlike the CO2 retention seen in emphysema, making this option inconsistent with the disease’s hypoventilation and impaired gas exchange characteristics.
C: Metabolic acidosis stems from non-respiratory causes like renal failure or diabetic ketoacidosis, unrelated to emphysema’s pulmonary dysfunction and CO2 retention.
D: Metabolic alkalosis arises from bicarbonate excess or acid loss, which contradicts emphysema’s hallmark CO2 buildup and respiratory-origin acid-base imbalance.
Which of these conditions could be a cause of metabolic acidosis?
Rationale:
Aspirin poisoning can cause metabolic acidosis. Aspirin overdose leads to the accumulation of salicylic acid and other acidic metabolites in the blood, lowering pH and causing metabolic acidosis. This condition disrupts normal acid-base balance through increased acid production and impaired renal acid excretion, resulting in a systemic acidotic state characteristic of metabolic acidosis.
B: Severe vomiting causes loss of stomach acid, which leads to metabolic alkalosis, not metabolic acidosis, as the body loses hydrochloric acid and the pH becomes more alkaline.
C: Severe diarrhoea causes metabolic acidosis by loss of bicarbonate; however, in the context of this question, aspirin poisoning is a more direct and classic cause.
D: Emphysema primarily results in respiratory acidosis due to CO2 retention, not metabolic acidosis, as it affects gas exchange rather than metabolic acid-base balance.
Which of the following is a major clinical manifestation of overhydration?
Rationale:
Overhydration commonly causes edema, which is the accumulation of excess fluid in body tissues. This swelling occurs because excess water increases the interstitial fluid volume, leading to puffiness, especially in extremities. Edema is a primary clinical sign indicating fluid overload, distinguishing it from other symptoms related to electrolyte imbalance or volume depletion, making it a hallmark manifestation of overhydration.
A: Hypotension involves low blood pressure, which typically results from fluid loss or vasodilation, not excess fluid volume; overhydration usually causes normal or elevated blood pressure rather than hypotension.
B: Dehydration refers to insufficient body water, the opposite of overhydration; thus, it cannot manifest as a symptom when the body already contains excess fluid.
D: Hyperkalemia is elevated potassium in the blood, generally linked to kidney dysfunction or cellular damage, not directly caused by excess fluid accumulation from overhydration.
Which of the following locations might the nurse use to assess the condition of an insertion site for a central venous access device?
Rationale:
The nurse might use the location over the jugular vein to assess the condition of an insertion site for a central venous access device. This site corresponds to a common access point for central lines, allowing direct observation of the insertion area for signs of infection, inflammation, or complications related to the catheter placement. It provides clear visibility and accessibility for assessment.
A: below the sternum is unsuitable because central venous access sites are typically not located there; this region does not provide direct access or visualization for catheter insertion sites.
B: over the fourth intercostal space is inappropriate since central venous catheters are rarely inserted here; this location is more related to cardiac auscultation sites.
D: the back of the hand is unsuitable because central venous access devices are not placed there; peripheral veins, not central veins, are accessed in this area.
A patient with liver cirrhosis is receiving diuretic therapy. The nurse observes confusion, irritability, and muscle twitching. The serum sodium level is 118 mEq/L. What is the most likely diagnosis?
Rationale:
Confusion, irritability, muscle twitching, and a serum sodium level of 118 mEq/L indicate hyponatremia. Hyponatremia occurs when sodium levels fall below 135 mEq/L, common in liver cirrhosis due to fluid retention and diuretic use. Symptoms reflect cerebral edema caused by low sodium, explaining the neurological manifestations observed in this patient receiving diuretic therapy for cirrhosis.
A: Hypernatremia Elevated sodium levels typically cause thirst, dry mucous membranes, and neurological symptoms from dehydration, not muscle twitching or irritability linked to low sodium levels seen here.
B: Hypocalcemia Low calcium usually causes tetany, Chvostek’s sign, or seizures but does not correlate with the low sodium or confusion associated with this patient's serum findings.
D: Hyperkalemia High potassium generally results in cardiac arrhythmias and muscle weakness rather than the neurological symptoms or low sodium level observed in this clinical scenario.
Why is the bicarbonate/carbonic acid buffering system a very effective system for the ECF?
Rationale:
Each bicarbonate ion can carry two H+ ions. The bicarbonate/carbonic acid system effectively buffers the ECF because bicarbonate ions neutralize excess hydrogen ions, preventing pH shifts. This capacity to bind two H+ ions makes it highly efficient, maintaining acid-base balance in plasma. The dynamic equilibrium between carbonic acid and bicarbonate ensures rapid response to pH changes in extracellular fluid.
A: because bicarbonate and carbonic acid are not closely regulated in the body Regulation is crucial; lack of control would disrupt pH balance, making this statement inaccurate regarding the system’s effectiveness in buffering ECF.
C: because carbonic acid dissociates very easily and is a strong acid Carbonic acid is a weak acid, not strong, and its moderate dissociation supports buffering without drastic pH changes, invalidating this claim.
D: because there is an abundance of bicarbonate and carbonic acid in the plasma Quantity alone does not guarantee buffering efficiency; the system’s effectiveness depends more on chemical properties and equilibrium, not just abundance.
A specially trained nurse has inserted a PICC line. What would be done next?
Rationale:
The next step after a PICC line insertion is to send the patient to the radiology department.
This step is essential to confirm correct catheter placement through imaging, ensuring the PICC line tip is properly positioned in a central vein. Verification prevents complications such as misplacement or vessel perforation, which could lead to ineffective treatment or serious harm. Radiographic confirmation guides safe and effective subsequent usage.
A: Start administration of prescribed fluids. Initiating fluids immediately risks infusing through an unconfirmed line, potentially causing harm if the catheter is misplaced or malfunctioning.
B: Explain the procedure to the patient and family. Explanation occurs before insertion, not after; post-insertion steps prioritize safety checks rather than communication.
C: Place the patient on restricted oral fluids. Oral fluid restriction is unrelated to PICC line insertion and does not address catheter placement verification or patient safety.
Which is not a cause of hypokalemia?
Rationale:
Digoxin OD is not a cause of hypokalemia. Hypokalemia results from shifts of potassium into cells or increased loss, but digoxin overdose typically leads to hyperkalemia due to inhibition of the Na+/K+ ATPase pump, causing potassium to remain extracellular. Therefore, digoxin OD does not cause low potassium levels, distinguishing it from the other options.
A: Insulin administration drives potassium into cells by stimulating Na+/K+ ATPase activity, causing extracellular potassium levels to drop and leading to hypokalemia.
B: Adrenaline infusion promotes potassium uptake into cells via beta-2 adrenergic receptor activation, resulting in decreased serum potassium concentrations.
C: Alkalosis causes potassium to shift intracellularly to maintain electrochemical balance, reducing serum potassium and contributing to hypokalemia.
A patient with a diagnosis of hypocalcemia is being treated with calcium gluconate. Which nursing intervention is essential while administering this medication?
Rationale:
Direct Answer: Monitor the patient for bradycardia and hypotension.
Correct Option Explanation: Calcium gluconate can cause cardiovascular effects such as bradycardia and hypotension during administration. Close monitoring ensures early detection of these adverse reactions, allowing timely intervention to prevent complications. These vital sign changes are critical due to calcium's role in cardiac conduction and vascular tone, making this nursing intervention essential for patient safety.
B: Check for signs of increased intracranial pressure. This is unrelated to calcium gluconate administration, as hypocalcemia treatment does not typically influence intracranial pressure or its clinical manifestations.
C: Observe for symptoms of hyperkalemia. Calcium gluconate primarily affects calcium levels and cardiac function, not potassium balance, so monitoring for hyperkalemia is not pertinent in this context.
D: Evaluate for nausea and vomiting post-administration. While gastrointestinal symptoms may occur with some medications, nausea and vomiting are not primary concerns when administering calcium gluconate intravenously.
Which body fluid is the fluid within the cells, constituting about 70% of the total body water?
Rationale:
Intracellular fluid (ICF) is the fluid within the cells, constituting about 70% of the total body water. Intracellular fluid resides inside cells and plays a critical role in cellular processes, maintaining cell shape and function. It contains essential ions and molecules necessary for metabolism, distinguishing it from fluids outside cells, which collectively represent the remaining 30% of body water.
A: Extracellular fluid (ECF) includes all body fluid outside cells, not within them, and accounts for approximately 30% of total body water, thus not representing the dominant fluid inside cells.
C: Intravascular fluid is the blood plasma component within blood vessels, a subset of extracellular fluid, and does not comprise the majority of body water inside cells.
D: Interstitial fluid bathes cells externally in tissue spaces, part of extracellular fluid, and therefore does not constitute the intracellular fluid that makes up 70% of total body water.
Which type of transeellular fluid is associated with the intestines?
Rationale:
Peritoneal fluid is the type of transcellular fluid associated with the intestines.
Peritoneal fluid is located within the peritoneal cavity, surrounding abdominal organs including the intestines, providing lubrication to reduce friction during digestive movements. It plays a critical role in facilitating smooth organ motion and protecting the intestines within the abdominal cavity. This fluid is essential for maintaining a healthy intestinal environment.
B: Pericardial fluid cushions the heart within the pericardial sac, not related to the intestines or abdominal cavity.
C: Intrapleural fluid exists between lung pleurae, aiding respiration, unrelated to the intestines or digestive system.
D: Synovial fluid is found in joint cavities, lubricating articulations, without any connection to intestinal structures or functions.
Because there are no IV pumps available for the immediate infusion of an IV medication, the nurse must calculate the flow rate for 500 mL to run for 4 h, using a set that delivers 15 gtt/mL. Which flow rate is correct?
Rationale:
The correct flow rate is 30 gtt/min.
Calculating flow rate involves dividing total volume (500 mL) by total time (4 hours), then converting to drops per minute using the drip factor (15 gtt/mL). This yields 125 mL/hour, equivalent to 31.25 gtt/min, rounded to 30 gtt/min for accuracy and safety in manual infusion without IV pumps.
B: 35 gtt/min overestimates the flow rate, potentially causing the medication to infuse too quickly, increasing risk of adverse effects due to faster than prescribed delivery.
C: 40 gtt/min significantly exceeds the calculated rate, which could lead to medication overdose and patient harm by infusing IV fluid too rapidly.
D: 45 gtt/min greatly surpasses the appropriate flow rate, risking dangerous infusion speed and compromising patient safety with excessive medication delivery.
Which of the following is the main cation in the extracellular fluid (ECF)?
Rationale:
Sodium (Na) is the main cation in the extracellular fluid (ECF). Sodium predominates in the ECF, playing a crucial role in maintaining osmotic balance, fluid distribution, and nerve impulse transmission. Its high concentration outside cells contrasts with potassium’s dominance inside cells, making sodium essential for regulating extracellular volume and contributing to vital physiological processes such as blood pressure control and muscle function.
A: Potassium (K) primarily resides inside cells, acting as the chief intracellular cation, which makes it less abundant and not the main cation in the extracellular fluid.
C: Calcium (Ca) is vital for bone structure and signaling but exists in much lower concentrations in extracellular fluid compared to sodium.
D: Magnesium (Mg) mainly functions intracellularly as a cofactor and does not serve as the predominant extracellular cation.
Which of the following is NOT a common cause of hypokalemia (low potassium levels)?
Rationale:
Hypokalemia is not commonly caused by constipation. Diuretic use, excessive vomiting, and kidney disease frequently lead to potassium loss or imbalance. Diuretics increase urinary potassium excretion; vomiting causes loss of gastric fluids rich in potassium; kidney disease disrupts potassium regulation. Constipation primarily affects bowel movements without significantly altering potassium levels in the body.
A: Diuretic use promotes potassium loss through urine, making it a frequent contributor to hypokalemia by increasing renal potassium excretion and disrupting electrolyte balance, thus leading to lower potassium levels in the bloodstream.
B: Excessive vomiting results in the loss of stomach contents, including potassium-rich fluids, which decreases overall potassium and contributes substantially to hypokalemia by depleting the body’s potassium stores.
C: Kidney disease impairs the kidney’s ability to regulate potassium, often causing increased potassium loss or improper retention, which can disrupt serum potassium balance and frequently result in hypokalemia.
D: Constipation primarily affects the digestive tract’s motility and does not cause significant potassium loss or redistribution, making it an uncommon and unlikely cause of hypokalemia.
Most nutritionists recommend increasing fiber in the diet. In addition to other benefits, how does fiber affect cholesterol?
Rationale:
Fiber increases fecal excretion of cholesterol. Soluble fiber binds to cholesterol and bile acids in the digestive tract, promoting their elimination through feces. This process reduces the overall cholesterol absorption into the bloodstream, thereby lowering blood cholesterol levels and contributing to cardiovascular health benefits associated with a high-fiber diet.
B: Decreases fecal excretion of cholesterol contradicts fiber’s known role, as fiber actually enhances cholesterol removal by binding it for elimination.
C: Facilitates intake and use of trans fat incorrectly associates fiber with trans fat metabolism, which fiber does not influence or promote in the body.
D: Raises blood cholesterol levels conflicts with evidence showing fiber helps reduce cholesterol absorption, thus lowering rather than increasing blood cholesterol concentrations.
Continuous renal replacement therapy (CRRT) differs from conventional intermittent hemodialysis in that
Rationale:
Continuous renal replacement therapy (CRRT) removes solutes and water slowly. CRRT is designed to provide gradual and continuous removal of waste products and excess fluids, reducing hemodynamic instability in critically ill patients. Unlike intermittent hemodialysis, which rapidly clears solutes, CRRT maintains steady-state conditions by slowly filtering blood over 24 hours, making it suitable for unstable patients requiring gentle fluid management.
A: A hemofilter is used in both CRRT and intermittent hemodialysis, so this does not uniquely characterize CRRT’s difference in treatment modality.
B: CRRT provides slower, not faster, removal of solute and water, prioritizing patient stability over rapid clearance.
C: Diffusion is a key mechanism in CRRT; it does allow solute exchange through diffusion alongside convection during treatment.
A nurse is helping a patient design a weight-loss diet. To lose 1 pound of fat (3,500 calories) per week, how many calories should be decreased each of the 7 days of the week?
Rationale:
To lose 1 pound of fat per week, the patient should decrease their calorie intake by 500 calories each day.
C: Reducing 500 calories daily over 7 days accumulates to a 3,500-calorie deficit, equivalent to losing one pound of fat weekly. This calculation aligns precisely with the energy balance principle essential for gradual, sustainable weight loss without compromising nutritional needs or metabolic function.
A: 100 calories daily only totals 700 calories per week, insufficient to reach the 3,500-calorie deficit required for losing one pound of fat within a week.
B: 250 calories daily results in a 1,750-calorie weekly deficit, which is half the amount necessary to burn one pound of fat in seven days.
D: 1,000 calories daily leads to a 7,000-calorie deficit weekly, doubling the target and risking excessive, unsafe caloric restriction beyond standard weight-loss guidelines.
Complications common to patients receiving hemodialysis for acute kidney injury include which of the following? (Select all that apply.)
Rationale:
Hypotension is a common complication in patients receiving hemodialysis for acute kidney injury. This occurs due to rapid fluid removal, leading to decreased blood volume and impaired vascular refill. The sudden shifts in fluid and electrolytes during hemodialysis can cause drops in blood pressure, making hypotension a frequent and significant concern in this clinical setting.
B: Dysrhythmias can occur during dialysis but are less common and usually related to severe electrolyte imbalances, not a primary complication like hypotension in acute kidney injury patients undergoing hemodialysis.
C: Muscle cramps may happen during hemodialysis but are not as prevalent or critical as hypotension, often resulting from electrolyte shifts rather than being a common, direct complication of treatment.
D: Hemolysis is a rare complication in hemodialysis and generally associated with mechanical issues in the dialysis circuit, not a typical or common complication in acute kidney injury patients receiving dialysis.
The count of the solution in the IV container at the beginning of the shift is 800 mL. A new 1000-mL bag was hung during the shift and has 650-mL left at the end of the shift. What amount should the nurse record as the IV fluid intake for the shift?
Rationale:
The nurse should record 1150 mL as the IV fluid intake for the shift.
D reflects the total volume infused: 800 mL initially present plus the 350 mL used from the new 1000-mL bag (1000 - 650 mL remaining). Adding these amounts gives the accurate total intake of 1150 mL during the shift.
A: 1000 mL only accounts for the new bag’s full volume, ignoring the initial 800 mL already in the container at shift start, leading to an underestimation.
B: 1050 mL combines the initial 800 mL and 250 mL used, but does not accurately calculate the actual fluid used from the new bag.
C: 1100 mL assumes 300 mL were used from the new bag, which conflicts with the 650 mL remaining, misrepresenting the total fluid administered.
Which of the following is NOT a sign of hyperkalemia?
Rationale:
Bradycardia is not a sign of hyperkalemia. Hyperkalemia typically causes tachycardia or arrhythmias rather than bradycardia. Elevated potassium levels affect cardiac conduction, leading to characteristic ECG changes and muscle symptoms, but a slow heart rate is uncommon. Signs like muscle weakness, hyperreflexia, and peaked T-waves on ECG are more consistent manifestations of increased serum potassium.
B: Hyperreflexia occurs due to increased neuromuscular excitability from elevated potassium levels, making it a recognized sign of hyperkalemia, hence it cannot be the correct answer here.
C: Muscle weakness results from impaired neuromuscular transmission caused by hyperkalemia, making it a classic clinical feature rather than an exclusion criterion.
D: Tall, peaked T-waves on ECG represent the hallmark cardiac manifestation of hyperkalemia, reflecting altered repolarization, so this option correctly indicates hyperkalemia signs, not a non-sign.