Fluid and electrolyte management — MCQs
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A 58-year-old cirrhotic man with ascites undergoes large volume paracentesis (6 liters removed). Four hours later, he becomes hypotensive (BP 80/50 mmHg) and tachycardic (HR 115/min). Labs show: Cr 2.1 mg/dL (baseline 1.0), Na+ 128 mEq/L, Hct 38%. What is the most appropriate immediate management?
A 42-year-old woman with prolonged vomiting from gastroparesis is admitted with weakness. Labs show: K+ 2.1 mEq/L, pH 7.51, HCO3- 42 mEq/L, Mg2+ 1.4 mg/dL. She receives 80 mEq of IV potassium chloride over 24 hours, but repeat K+ is 2.3 mEq/L. What explains the refractory hypokalemia?
A 65-year-old diabetic man with TURP syndrome presents with confusion, nausea, and seizures 2 hours post-operatively. Labs show: Na+ 115 mEq/L, serum osmolality 240 mOsm/kg. He weighs 70 kg. What is the target sodium correction rate and fluid management strategy?
A 50-year-old man is 5 days post-operative from a Whipple procedure. He has had high nasogastric output (1500 mL/day) and has been NPO. Labs show: Na+ 132 mEq/L, K+ 2.9 mEq/L, Cl- 88 mEq/L, HCO3- 38 mEq/L, pH 7.52. Urine chloride is 8 mEq/L. What is the appropriate management?
A 28-year-old trauma patient received 8 units of packed RBCs, 6 units of FFP, and 2 units of platelets during damage control surgery. Two hours post-op, he develops: peaked T waves on EKG, K+ 6.8 mEq/L, Ca2+ 7.2 mg/dL, ionized calcium 0.9 mmol/L, pH 7.25. Which metabolic derangement is most responsible for his cardiac instability?
A 38-year-old woman develops severe diarrhea after small bowel resection for Crohn's disease. Over 3 days, she has lost 6 kg. Labs show: Na+ 148 mEq/L, K+ 2.8 mEq/L, Cl- 118 mEq/L, HCO3- 15 mEq/L, BUN 45 mg/dL, Cr 1.8 mg/dL (baseline 0.9). Urine sodium is 8 mEq/L. What fluid should be administered?
A 70-year-old man with small bowel obstruction has been receiving aggressive IV fluid resuscitation with normal saline for 48 hours (total 12 liters). His nasogastric tube has drained 3 liters. Labs show: Na+ 138 mEq/L, K+ 3.2 mEq/L, Cl- 112 mEq/L, HCO3- 18 mEq/L, pH 7.30. What acid-base disturbance is present?
A 55-year-old man with a history of alcoholism presents with acute pancreatitis. His calcium level is 6.8 mg/dL, albumin is 2.5 g/dL, and he is symptomatic with perioral numbness and carpopedal spasm. After correcting for albumin, his corrected calcium is 7.6 mg/dL. What is the most appropriate initial treatment?
A 62-year-old woman develops postoperative hyponatremia (sodium 118 mEq/L) on day 2 after a total colectomy. She is confused and lethargic. Her urine sodium is 45 mEq/L, urine osmolality is 520 mOsm/kg, and serum osmolality is 245 mOsm/kg. She has been receiving D5W at 125 mL/hr. What is the most likely cause of her hyponatremia?
A 45-year-old man undergoes emergent exploratory laparotomy for a gunshot wound to the abdomen. Intraoperatively, 2 liters of blood are lost. His blood pressure is 85/50 mmHg, heart rate is 125/min, and urine output is 15 mL/hr. The anesthesiologist has administered 3 liters of lactated Ringer's solution. What is the most appropriate next step in fluid resuscitation?
Fluid and electrolyte management US Medical PG Practice Questions and MCQs
Question 1: A 58-year-old cirrhotic man with ascites undergoes large volume paracentesis (6 liters removed). Four hours later, he becomes hypotensive (BP 80/50 mmHg) and tachycardic (HR 115/min). Labs show: Cr 2.1 mg/dL (baseline 1.0), Na+ 128 mEq/L, Hct 38%. What is the most appropriate immediate management?
- A. 5% albumin 6-8 grams per liter of ascites removed (Correct Answer)
- B. Normal saline bolus 2 liters
- C. Octreotide and midodrine for hepatorenal syndrome
- D. Vasopressors to maintain blood pressure
- E. Re-infusion of filtered ascitic fluid
Explanation: ***5% albumin 6-8 grams per liter of ascites removed*** - This patient is experiencing **post-paracentesis circulatory dysfunction (PPCD)**, characterized by hypotension and **acute kidney injury** (doubled creatinine) following a large volume paracentesis (>5L). - Administration of **intravenous albumin** is the gold standard treatement to expand the **effective arterial blood volume** and prevent further deterioration into hepatorenal syndrome. *Normal saline bolus 2 liters* - In cirrhotic patients, **crystalloids** are less effective as they rapidly redistribute into the **interstitial space** (third-spacing) and can worsen ascites/edema. - Saline does not provide the **oncotic pressure** required to counteract the splanchnic vasodilation typical of PPCD. *Octreotide and midodrine for hepatorenal syndrome* - While these agents are used for **Hepatorenal Syndrome (HRS)**, the immediate priority in post-procedure hypotension is **volume expansion** to correct the circulatory dysfunction. - These medications are typically reserved for patients who do not respond to **volume expansion with albumin** or meet specific criteria for type 1 HRS. *Vasopressors to maintain blood pressure* - Vasopressors like **norepinephrine** are generally considered after fluid resuscitation with **albumin** has failed to restore hemodynamic stability. - Using pressors alone ignores the underlying **intravascular volume deficit** caused by the fluid shift after paracentesis. *Re-infusion of filtered ascitic fluid* - This is not a standard or recommended clinical practice due to risks of **infection**, **coagulopathy**, and lack of evidence for efficacy. - The specific requirement in this pathology is **concentrated albumin** to maintain oncotic pressure, which ascitic fluid does not provide efficiently.
Question 2: A 42-year-old woman with prolonged vomiting from gastroparesis is admitted with weakness. Labs show: K+ 2.1 mEq/L, pH 7.51, HCO3- 42 mEq/L, Mg2+ 1.4 mg/dL. She receives 80 mEq of IV potassium chloride over 24 hours, but repeat K+ is 2.3 mEq/L. What explains the refractory hypokalemia?
- A. Secondary hyperaldosteronism from volume depletion
- B. Insufficient potassium replacement dose
- C. Ongoing losses from continued vomiting
- D. Metabolic alkalosis promoting intracellular potassium shift
- E. Hypomagnesemia preventing potassium retention (Correct Answer)
Explanation: ***Hypomagnesemia preventing potassium retention*** - Low **intracellular magnesium** inhibits **ROMK channels** in the renal collecting duct; without magnesium inhibition, these channels allow excessive **potassium secretion** into the urine. - **Magnesium** is also a necessary cofactor for the **Na+/K+-ATPase pump**, which is required to transport potassium into the cells and maintain serum levels. *Secondary hyperaldosteronism from volume depletion* - While **volume depletion** triggers the **Renin-Angiotensin-Aldosterone System (RAAS)**, leading to potassium loss, it does not typically cause absolute refraction to supplementation in the presence of adequate IV fluids. - Addressing the **volume status** alone will not fix the hypokalemia if the **magnesium deficiency** is still driving renal wasting. *Insufficient potassium replacement dose* - A dose of **80 mEq** over 24 hours is a significant amount of supplement for a patient who is hospitalized and being monitored. - Failure to increase serum potassium by more than 0.2 mEq/L despite high-dose IV replacement suggests an **active wasting mechanism** rather than just an under-correction. *Ongoing losses from continued vomiting* - Although vomiting causes loss of **hydrochloric acid** and induces **metabolic alkalosis**, the gastric fluid itself contains relatively low concentrations of potassium. - The primary cause of hypokalemia in vomiting is **renal loss** (due to alkalosis and RAAS) rather than direct loss of potassium from the stomach. *Metabolic alkalosis promoting intracellular potassium shift* - **Alkalosis** causes an intracellular shift of potassium as **hydrogen ions** exit cells to help buffer the serum pH. - While this contributes to the initial low lab value, it does not explain why **exogenous IV potassium** fails to raise the serum concentration over a 24-hour period.
Question 3: A 65-year-old diabetic man with TURP syndrome presents with confusion, nausea, and seizures 2 hours post-operatively. Labs show: Na+ 115 mEq/L, serum osmolality 240 mOsm/kg. He weighs 70 kg. What is the target sodium correction rate and fluid management strategy?
- A. Conivaptan infusion for water diuresis
- B. Normal saline infusion with fluid restriction
- C. Rapid correction to 135 mEq/L with 3% hypertonic saline over 4 hours
- D. Increase sodium by 6-8 mEq/L in first 24 hours with 3% saline boluses
- E. 3% saline to increase sodium by 4-6 mEq/L in first 2-4 hours, then slower correction (Correct Answer)
Explanation: ***3% saline to increase sodium by 4-6 mEq/L in first 2-4 hours, then slower correction*** - For **acute symptomatic hyponatremia** (seizures, confusion) in **TURP syndrome**, a rapid initial rise of **4-6 mEq/L** is required to reverse cerebral edema and prevent herniation. - After the initial stabilization, the rate is slowed to stay within **6-8 mEq/L per 24 hours** to mitigate the risk of **Osmotic Demyelination Syndrome (ODS)**. *Conivaptan infusion for water diuresis* - **Vaptans** are Vasopressin receptor antagonists typically used for **euvolemic hyponatremia** (SIADH) rather than acute, life-threatening hyponatremia. - This treatment is too slow for a patient presenting with **seizures** and severe neurological compromise. *Normal saline infusion with fluid restriction* - **Normal saline (0.9%)** may worsen hyponatremia in high ADH states or be insufficient to rapidly increase sodium in a **hypervolemic** post-TURP state. - **Fluid restriction** alone is an appropriate long-term strategy for mild cases but is contraindicated as primary therapy for **acute, symptomatic seizures**. *Rapid correction to 135 mEq/L with 3% hypertonic saline over 4 hours* - Correcting sodium to **normal levels (135 mEq/L)** too quickly represents an overcorrection that carries an extremely high risk of **pontine myelinolysis**. - The goal of emergency treatment is **symptom reversal**, not immediate normalization of laboratory values. *Increase sodium by 6-8 mEq/L in first 24 hours with 3% saline boluses* - While 6-8 mEq/L is a safe 24-hour target, it does not prioritize the necessary **early rapid rise** needed in the first few hours for a patient having **seizures**. - This approach lacks the specific **2-4 hour urgency** required to manage active intracranial pressure increases from acute hypotonicity.
Question 4: A 50-year-old man is 5 days post-operative from a Whipple procedure. He has had high nasogastric output (1500 mL/day) and has been NPO. Labs show: Na+ 132 mEq/L, K+ 2.9 mEq/L, Cl- 88 mEq/L, HCO3- 38 mEq/L, pH 7.52. Urine chloride is 8 mEq/L. What is the appropriate management?
- A. Discontinue nasogastric suction only
- B. Normal saline with potassium chloride (Correct Answer)
- C. Acetazolamide to promote bicarbonate excretion
- D. Half-normal saline with potassium supplementation
- E. Hydrochloric acid infusion
Explanation: ***Normal saline with potassium chloride*** - The patient has **hypochloremic, hypokalemic metabolic alkalosis** due to high-output gastric suctioning; a **urine chloride <10 mEq/L** confirms it is **chloride-responsive**. - Administering **Isotonic Saline (0.9% NaCl)** restores volume and provides the chloride needed to promote renal **bicarbonate excretion**, while **KCl** corrects the hypokalemia that maintains alkalosis. *Discontinue nasogastric suction only* - While suctioning is the source of acid loss, stopping it alone does not address the existing **volume depletion** or the severe **electrolyte imbalances** already present. - The kidneys require exogenous **chloride replacement** to effectively reverse the metabolic alkalosis and restore acid-base balance. *Acetazolamide to promote bicarbonate excretion* - This carbonic anhydrase inhibitor can lower bicarbonate but may worsen **hypokalemia** and contributes to further **volume depletion**. - It is generally reserved for patients with severe volume overload who cannot tolerate saline, which is not the case for this **hypovolemic** patient. *Half-normal saline with potassium supplementation* - **0.45% Saline** provides less sodium and chloride than required for rapid volume expansion and correction of **contraction alkalosis**. - **Isotonic 0.9% saline** is preferred to reliably expand the **extracellular fluid volume** and suppress the renin-angiotensin-aldosterone system. *Hydrochloric acid infusion* - This is an extreme measure reserved for life-threatening **metabolic alkalosis (pH >7.55-7.60)** that is refractory to standard saline and potassium replacement. - It requires **central venous access** due to its caustic nature and is not indicated as initial management for **chloride-responsive** states.
Question 5: A 28-year-old trauma patient received 8 units of packed RBCs, 6 units of FFP, and 2 units of platelets during damage control surgery. Two hours post-op, he develops: peaked T waves on EKG, K+ 6.8 mEq/L, Ca2+ 7.2 mg/dL, ionized calcium 0.9 mmol/L, pH 7.25. Which metabolic derangement is most responsible for his cardiac instability?
- A. Hypothermia-induced arrhythmia
- B. Hyperkalemia from massive transfusion
- C. Hypocalcemia from citrate toxicity
- D. Combined hyperkalemia and hypocalcemia (Correct Answer)
- E. Metabolic acidosis alone
Explanation: ***Combined hyperkalemia and hypocalcemia*** - Massive transfusion protocols involve multiple blood products that synergistically cause **hyperkalemia** (due to potassium leakage from stored RBCs) and **hypocalcemia** (due to **citrate anticoagulants** binding ionized calcium). - These two derangements are most responsible for cardiac instability because **hypocalcemia** lowers the threshold for action potential while **hyperkalemia** increases membrane excitability, significantly increasing the risk of **fatal arrhythmias**. *Hypothermia-induced arrhythmia* - While massive transfusion can cause hypothermia if blood products aren't warmed, the primary markers here are **hyperkalemia** and **hypocalcemia**. - Hypothermia typically presents with **Osborn (J) waves** on EKG rather than the **peaked T waves** seen in this patient. *Hyperkalemia from massive transfusion* - Hyperkalemia alone explains the **peaked T waves** and elevated K+ of 6.8 mEq/L, but it ignores the significant **low ionized calcium (0.9 mmol/L)**. - Cardiac stabilization in this setting requires treating both electrolytes; addressing potassium without calcium is insufficient for **myocardial membrane stabilization**. *Hypocalcemia from citrate toxicity* - Citrate in FFP and PRBCs binds calcium, leading to the reported **ionized calcium** level, which can cause QT prolongation and reduced contractility. - This option is incomplete as it fails to account for the **life-threatening hyperkalemia** evidenced by the elevated serum potassium and EKG changes. *Metabolic acidosis alone* - The **pH of 7.25** indicates a metabolic acidosis which can shift K+ out of cells, but it is a contributing factor rather than the primary cause of instability in this 2-hour post-op window. - Acidosis primarily worsens the severity of **citrate toxicity** by decreasing the liver\'s ability to metabolize citrate, further exacerbating the hypocalcemia.
Question 6: A 38-year-old woman develops severe diarrhea after small bowel resection for Crohn's disease. Over 3 days, she has lost 6 kg. Labs show: Na+ 148 mEq/L, K+ 2.8 mEq/L, Cl- 118 mEq/L, HCO3- 15 mEq/L, BUN 45 mg/dL, Cr 1.8 mg/dL (baseline 0.9). Urine sodium is 8 mEq/L. What fluid should be administered?
- A. 3% hypertonic saline
- B. 0.9% normal saline with 40 mEq/L potassium chloride
- C. 0.45% normal saline with 20 mEq/L potassium chloride
- D. Lactated Ringer's solution with potassium supplementation (Correct Answer)
- E. D5W with potassium phosphate
Explanation: ***Lactated Ringer's solution with potassium supplementation*** - **Lactated Ringer's (LR)** is the ideal crystalloid for volume resuscitation in this patient as the **lactate** is metabolized to bicarbonate, helping to correct her **hyperchloremic metabolic acidosis**. - Compared to Normal Saline, LR has a **lower sodium content** (130 mEq/L) which helps address the **hypernatremia**, while potassium supplementation is vital to treat the severe **hypokalemia** (2.8 mEq/L). *3% hypertonic saline* - This solution is used for treating severe **hyponatremia** or cerebral edema, whereas this patient is already **hypernatremic** (Na+ 148 mEq/L). - Administration would dangerously worsen the hyperosmolar state and aggravate **cellular dehydration**. *0.9% normal saline with 40 mEq/L potassium chloride* - **Normal Saline (0.9% NaCl)** contains 154 mEq/L of chloride, which can exacerbate the patient's existing **hyperchloremia** and metabolic acidosis. - It is less physiologic than LR in this scenario of **bicarbonate loss** typically seen in small bowel diarrhea. *0.45% normal saline with 20 mEq/L potassium chloride* - **0.45% NaCl (Half-normal saline)** is a hypotonic solution unsuitable for initial **resuscitation** in a patient with 6 kg of acute weight loss and signs of **prerenal azotemia**. - It lacks sufficient volume expansion capacity and does not provide an **alkalinizing agent** to treat the systemic acidosis correctly. *D5W with potassium phosphate* - **D5W** is essentially free water and is contraindicated as an initial resuscitation fluid in **hypovolemic shock** as it will not stay in the intravascular space. - While it provides water for hypernatremia, it fails to restore the **effective circulating volume** needed to correct the elevated **creatinine** and BUN.
Question 7: A 70-year-old man with small bowel obstruction has been receiving aggressive IV fluid resuscitation with normal saline for 48 hours (total 12 liters). His nasogastric tube has drained 3 liters. Labs show: Na+ 138 mEq/L, K+ 3.2 mEq/L, Cl- 112 mEq/L, HCO3- 18 mEq/L, pH 7.30. What acid-base disturbance is present?
- A. Metabolic alkalosis with paradoxical aciduria
- B. Metabolic acidosis with appropriate respiratory compensation
- C. Normal anion gap metabolic acidosis from saline administration
- D. High anion gap metabolic acidosis from bowel ischemia
- E. Mixed metabolic acidosis: high anion gap and normal anion gap (Correct Answer)
Explanation: ***Mixed metabolic acidosis: high anion gap and normal anion gap*** - The patient has **metabolic acidosis** (pH 7.30, Low HCO3-) with an **anion gap** calculated as 138 - (112 + 18) = 8 mEq/L, which typically suggests a **normal anion gap metabolic acidosis (NAGMA)**. - However, the massive **Normal Saline** infusion (12L) causes **hyperchloremic acidosis**, while the clinical context of small bowel obstruction and potential **hypoperfusion** suggests an underlying **high anion gap metabolic acidosis (HAGMA)** that is being offset by the extreme chloride load, indicating a mixed process. *Metabolic alkalosis with paradoxical aciduria* - Gastric suctioning via **nasogastric tube** typically causes loss of H+ and Cl-, leading to **contraction alkalosis**, which is the opposite of this patient's acidic pH. - **Paradoxical aciduria** occurs in severe volume depletion where the kidney reabsorbs Na+ at the expense of H+ secretion, but this patient's labs show clear **acidosis**. *Metabolic acidosis with appropriate respiratory compensation* - While the low pH and low bicarbonate confirm **metabolic acidosis**, this option fails to address the specific etiology or the **mixed nature** of the anion gap. - Respiratory compensation is expected, but the primary clinical task is identifying the specific **physiologic mechanisms** (saline vs. ischemia) driving the pH change. *Normal anion gap metabolic acidosis from saline administration* - Large volumes of **0.9% Normal Saline** cause **hyperchloremic metabolic acidosis** because the chloride concentration (154 mEq/L) is higher than plasma levels. - While NAGMA is present, focusing only on this ignores the potential for **lactic acidosis** (HAGMA) given the clinical setting of **small bowel obstruction** and intensive resuscitation. *High anion gap metabolic acidosis from bowel ischemia* - Ischemia leads to **lactic acidosis**, which increases the **anion gap**; however, the calculated gap here is numerically normal (8 mEq/L). - This diagnosis cannot be made in isolation because the **hyperchloremia** from saline resuscitation has altered the electrolyte profile to look like a NAGMA.
Question 8: A 55-year-old man with a history of alcoholism presents with acute pancreatitis. His calcium level is 6.8 mg/dL, albumin is 2.5 g/dL, and he is symptomatic with perioral numbness and carpopedal spasm. After correcting for albumin, his corrected calcium is 7.6 mg/dL. What is the most appropriate initial treatment?
- A. Magnesium sulfate 2 grams IV followed by calcium (Correct Answer)
- B. Oral calcium carbonate 1000 mg three times daily
- C. Intravenous calcium gluconate 1-2 grams over 10 minutes
- D. Intravenous calcium chloride bolus
- E. Vitamin D supplementation only
Explanation: ***Magnesium sulfate 2 grams IV followed by calcium*** - In patients with a history of **alcoholism** and **acute pancreatitis**, hypocalcemia is frequently driven by concurrent **hypomagnesemia**. - Magnesium is a necessary cofactor for **PTH secretion** and end-organ responsiveness; failure to correct magnesium first will result in **refractory hypocalcemia**. *Oral calcium carbonate 1000 mg three times daily* - Oral supplementation is inappropriate for **acute, symptomatic hypocalcemia** (perioral numbness, carpopedal spasm) which requires immediate IV intervention. - Patients with acute pancreatitis often have **impaired absorption** and high metabolic demand, making the oral route insufficient. *Intravenous calcium gluconate 1-2 grams over 10 minutes* - While IV calcium gluconate is used for symptomatic hypocalcemia, it will be **ineffective** if the underlying **hypomagnesemia** is not addressed first. - Magnesium deficiency causes a functional **hypoparathyroidism**, preventing the body from maintaining calcium levels even after IV administration. *Intravenous calcium chloride bolus* - Calcium chloride is significantly more **caustic to peripheral veins** and is generally reserved for emergency situations like **cardiac arrest** or severe hyperkalemia. - Giving a bolus without addressing the **magnesium deficit** in an alcoholic patient fails to treat the root cause of the electrolyte disturbance. *Vitamin D supplementation only* - Vitamin D takes **days to weeks** to increase serum calcium levels via intestinal absorption and bone resorption, which is too slow for acute management. - It does not address the immediate life-threatening potential of **neuromuscular irritability** or the secondary effects of pancreatitis-related **saponification**.
Question 9: A 62-year-old woman develops postoperative hyponatremia (sodium 118 mEq/L) on day 2 after a total colectomy. She is confused and lethargic. Her urine sodium is 45 mEq/L, urine osmolality is 520 mOsm/kg, and serum osmolality is 245 mOsm/kg. She has been receiving D5W at 125 mL/hr. What is the most likely cause of her hyponatremia?
- A. Diuretic use
- B. Cerebral salt wasting
- C. Syndrome of inappropriate ADH secretion (SIADH) (Correct Answer)
- D. Primary polydipsia
- E. Adrenal insufficiency
Explanation: ***Syndrome of inappropriate ADH secretion (SIADH)*** - This patient demonstrates **hypotonic hyponatremia** with **high urine sodium (>40 mEq/L)** and inappropriately concentrated urine, which are the diagnostic hallmarks of **SIADH**. - Postoperative **pain, stress, and nausea** are potent triggers for ADH release, and the administration of **hypotonic fluids (D5W)** further worsens the water retention and hyponatremia. *Diuretic use* - Although diuretics can cause hyponatremia and high urine sodium, they usually lead to **hypovolemia** and elevated **blood urea nitrogen (BUN)** levels, which are not described here. - Thiazide diuretics are a more common cause of hyponatremia than loop diuretics, but there is no history of medication use in this patient. *Cerebral salt wasting* - This condition occurs primarily in patients with **central nervous system pathology** (e.g., subarachnoid hemorrhage) and results in massive **renal sodium wasting**. - It is distinguished from SIADH by the presence of true **hypovolemia** and clinical signs of dehydration, whereas SIADH patients are usually **euvolemic**. *Primary polydipsia* - In primary polydipsia, the excess intake of water leads to maximal suppression of ADH, resulting in **dilute urine** (osmolality <100 mOsm/kg). - This patient has a **high urine osmolality (520 mOsm/kg)**, which directly contradicts a diagnosis of primary polydipsia. *Adrenal insufficiency* - Acute adrenal insufficiency can cause hyponatremia due to lack of mineralocorticoids but is typically associated with **hyperkalemia** and **hypotension**. - The clinical context of recent surgery and the specific labs provided (euvolemic hyponatremia) more strongly favor **SIADH** over adrenal failure.
Question 10: A 45-year-old man undergoes emergent exploratory laparotomy for a gunshot wound to the abdomen. Intraoperatively, 2 liters of blood are lost. His blood pressure is 85/50 mmHg, heart rate is 125/min, and urine output is 15 mL/hr. The anesthesiologist has administered 3 liters of lactated Ringer's solution. What is the most appropriate next step in fluid resuscitation?
- A. Give fresh frozen plasma only
- B. Continue crystalloid resuscitation with normal saline
- C. Administer packed red blood cells (Correct Answer)
- D. Give 5% albumin solution
- E. Administer hypertonic saline
Explanation: ***Administer packed red blood cells*** - The patient exhibits **hemorrhagic shock** (Class III/IV) with significant blood loss and persistent **hypotension** and **tachycardia** despite initial crystalloid resuscitation. - **Packed red blood cells (PRBCs)** are essential to restore **oxygen-carrying capacity** and volume in patients who do not stabilize after early crystalloid infusion. *Give fresh frozen plasma only* - **Fresh frozen plasma (FFP)** is used to replace clotting factors and is typically given alongside PRBCs in a **massive transfusion protocol**. - Using FFP alone does not address the critical need for **hemoglobin** and oxygen delivery in acute traumatic hemorrhage. *Continue crystalloid resuscitation with normal saline* - Excessive **crystalloid administration** can lead to **hemodilution**, coagulopathy, and "the lethal triad" in trauma patients. - This patient has already received 3 liters of fluid; continuing with only crystalloids fails to address the **2-liter blood loss** effectively. *Give 5% albumin solution* - **Albumin** is a colloid that may be used for volume expansion but has no advantage over blood products in **acute trauma** management. - Colloid solutions like albumin do not provide the **erythrocytes** needed to treat the profound anemia associated with a 2-liter hemorrhage. *Administer hypertonic saline* - **Hypertonic saline** is primarily used to manage **intracranial pressure** in head trauma rather than as a primary resuscitation fluid for hemorrhagic shock. - It provides rapid but transient volume expansion and does not replace the **red cell mass** lost during surgery.
Practice by Chapter
Body fluid compartments
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Assessment of volume status
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Crystalloid vs. colloid solutions
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Maintenance fluid requirements
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Replacement of ongoing losses
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Electrolyte disorders (Na, K, Ca, Mg)
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Acid-base disorders in surgical patients
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Goal-directed fluid therapy
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Fluid management in special populations
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Transfusion triggers and strategies
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Blood component therapy
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Massive transfusion protocols
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Point-of-care coagulation testing
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