Massive Transfusion Protocol — MCQs

10 questions

What is the volume threshold that defines a massive blood transfusion?

In the initial management of a hemodynamically unstable polytrauma patient, what is the recommended initial crystalloid bolus dose of Ringer's lactate for assessment and stabilization?

A patient is in shock with gross comminuted fracture. The first step in management is to give

Which of the following is the complication of massive blood transfusion?

Thrombotic thrombocytopenic purpura is a syndrome characterized by which of the following?

A patient who presented with blunt abdominal injury underwent complete repair of liver and was given transfusion of 12 units of whole blood. Thereafter, it is found that the wound is bleeding. It is treated by

All of the following are major complications of massive transfusion, except:

In a post-operative patient, 21 years old with a weight of 70 kg, what is the expected increase in hematocrit after transfusion of 1 unit of packed RBC?

Which one of the following is NOT a complication of massive blood transfusion?

Q10

Which of the following is NOT a recognized complication of massive blood transfusion?

Massive Transfusion Protocol Indian Medical PG Practice Questions and MCQs

Question 1: What is the volume threshold that defines a massive blood transfusion?

A. Transfusion of 1 unit every 30 minutes for 6 hours.
B. Transfusion of 5 units in 12 hours.
C. More than 10 units in 24 hours. (Correct Answer)
D. Transfusion of 8 units in 24 hours.

Explanation: ***More than 10 units in 24 hours.*** - This is the **most widely accepted and standard definition** for a massive blood transfusion used in clinical practice and medical literature. - This threshold indicates that a patient has received a volume of blood products roughly equivalent to their **total blood volume** within a 24-hour period. - This definition is used to trigger **massive transfusion protocols (MTP)** in trauma and critical care settings. *Transfusion of 1 unit every 30 minutes for 6 hours.* - This scenario would result in 12 units over 6 hours, which does represent a massive transfusion situation clinically. However, the **standard textbook definition** refers to the total unit threshold over a 24-hour period, not a rate-based criterion. - While this rate of transfusion is critical and would trigger massive transfusion protocols, the question asks for the **volume threshold definition**, which is standardly stated as ≥10 units in 24 hours. *Transfusion of 5 units in 12 hours.* - This volume of transfusion is considered a **moderate to large transfusion**, not meeting the criteria for a massive blood transfusion. - While substantial and requiring close monitoring, it does not reach the commonly accepted threshold of 10 or more units within 24 hours. *Transfusion of 8 units in 24 hours.* - This amount is significant but falls short of the conventional definition of a **massive blood transfusion**, which requires 10 or more units in 24 hours. - While requiring aggressive management and monitoring, it doesn't meet the standard diagnostic threshold for massive transfusion.

Question 2: In the initial management of a hemodynamically unstable polytrauma patient, what is the recommended initial crystalloid bolus dose of Ringer's lactate for assessment and stabilization?

A. 2000 ml Ringer's lactate bolus
B. 1000 ml Ringer's lactate bolus, then regulated by clinical indicators (Correct Answer)
C. 250 ml Ringer's lactate bolus
D. 500 ml Ringer's lactate bolus, then regulated by clinical indicators

Explanation: ***1000 ml Ringer's lactate bolus, then regulated by clinical indicators*** - For **hemodynamically unstable** polytrauma patients, the initial recommended crystalloid bolus is typically **1 liter (1000 mL)** of Ringer's lactate. - This initial bolus allows for rapid assessment of the patient's response and guides subsequent fluid management based on **clinical indicators** such as blood pressure, heart rate, and urine output, avoiding over-resuscitation. *2000 ml Ringer's lactate bolus* - A **2000 ml bolus** is generally considered too large for an initial dose in trauma, as it can lead to **dilutional coagulopathy**, worsening hemorrhage, and **abnormal fluid shifts**, especially in cases where definitive hemorrhage control is not yet achieved. - Excessive fluid administration can lead to complications such as **abdominal compartment syndrome** and **acute respiratory distress syndrome (ARDS)**. *250 ml Ringer's lactate bolus* - A **250 ml bolus** is generally too small to effectively address **hemodynamic instability** in a polytrauma patient, offering insufficient volume to significantly improve circulation or organ perfusion. - While small boluses might be used in specific situations (e.g., small children or patients with cardiac comorbidities), this dose is not adequate for initial resuscitation in a severely unstable adult trauma patient. *500 ml Ringer's lactate bolus, then regulated by clinical indicators* - While **500 mL** is a common bolus size in other medical settings, it may be insufficient for the initial resuscitation of a **hemodynamically unstable adult polytrauma patient**. - Current trauma guidelines often recommend a larger initial bolus (e.g., 1000 mL) to gain a more immediate and measurable hemodynamic response for assessment.

Question 3: A patient is in shock with gross comminuted fracture. The first step in management is to give

A. Blood transfusion
B. Ringer's Lactate solution intravenously (Correct Answer)
C. Plasma expanders
D. Normal saline intravenously

Explanation: ***Ringer's Lactate solution intravenously*** - In cases of **hypovolemic shock**, the immediate priority is to restore circulating volume with an **isotonic crystalloid solution** like **Ringer's Lactate**. - This helps to stabilize hemodynamics and perfuse vital organs, while other measures are prepared. *Blood transfusion* - While blood loss is a concern in gross comminuted fractures, **blood transfusions** are generally reserved for more severe, confirmed blood loss and are often given after initial crystalloid resuscitation. - Type-specific or cross-matched blood may take time to prepare and administer. *Plasma expanders* - **Plasma expanders** (e.g., colloids) are alternatives but are generally not the first-line choice over crystalloids for initial resuscitation in trauma, due to their higher cost and potential side effects, with no clear survival benefit. - They also do not address the acute need for volume replacement as effectively as initial rapid infusion of crystalloids. *Normal saline intravenously* - **Normal saline** is an isotonic crystalloid and could be used; however, **Ringer's Lactate** is often preferred in large volumes for trauma and shock patients because its balanced electrolyte composition closer to plasma may help to prevent **hyperchloremic acidosis**. - While not as detrimental as in very large volumes, normal saline can contribute to metabolic acidosis when given in excessive amounts.

Question 4: Which of the following is the complication of massive blood transfusion?

A. Respiratory alkalosis
B. Metabolic acidosis
C. Respiratory acidosis
D. Metabolic alkalosis (Correct Answer)

Explanation: ***Metabolic alkalosis*** - **Citrate**, an anticoagulant in stored blood, is metabolized by the liver into **bicarbonate**, which can accumulate with massive transfusion. [2] - This bicarbonate excess leads to a rise in blood pH, causing **metabolic alkalosis**. [2] *Respiratory alkalosis* - This typically results from **hyperventilation**, leading to excessive CO2 exhalation. [1] - It is not a direct complication of the chemical constituents or physiological effects of massive blood transfusions. *Metabolic acidosis* - While sometimes seen in early phases due to reduced tissue perfusion or hypothermia in massive transfusion, the predominant and later complication (especially with adequately functioning liver) is metabolic alkalosis due to citrate metabolism. - **Lactic acidosis** can occur in shock or hypoperfusion states, but the buffering capacity and citrate metabolism often shift towards alkalosis. *Respiratory acidosis* - This results from **hypoventilation** or impaired CO2 removal, leading to CO2 retention in the blood. [1] - It is not directly caused by the components of a massive blood transfusion itself.

Question 5: Thrombotic thrombocytopenic purpura is a syndrome characterized by which of the following?

A. Thrombocytopenia, anemia, neurological abnormalities, progressive renal failure and fever (Correct Answer)
B. Thrombocytopenia, anemia, neurological abnormalities, progressive hepatic failure and fever
C. Thrombocytopenia, normal anemia, neurological abnormalities, progressive renal failure and fever
D. Thrombocytopenia, anemia, no neurological abnormalities, progressive renal failure and fever

Explanation: ***Thrombocytopenia, anemia, neurological abnormalities, progressive renal failure and fever*** - Thrombotic thrombocytopenic purpura is characterized by **thrombocytopenia** and **microangiopathic hemolytic anemia**, along with neurological and renal complications [1][2]. - The presence of **fever** and other systemic symptoms is consistent with this **thrombotic microangiopathy** syndrome [1]. *Thrombocytosis, anemia, neurologic abnormalities, progressive renal failure and fever* - This option incorrectly lists **thrombocytosis** rather than **thrombocytopenia**, which is a hallmark of thrombotic thrombocytopenic purpura (TTP) [1]. - While it includes anemia, the absence of thrombocytopenia makes it inconsistent with TTP's classic presentation [2]. *Thrombocytopenia, anemia, neurologic abnormalities, progressive hepatic failure and fever* - Although it correctly states **thrombocytopenia** and **anemia**, it incorrectly identifies **progressive hepatic failure** instead of **renal failure**, which is a key feature of TTP [1]. - The presence of neurological abnormalities and fever does align with TTP; however, the hepatic failure aspect is misleading. *Thrombocytosis, anemia neurologic abnormalities, progressive renal failure and fever* - Again, this option incorrectly notes **thrombocytosis**, contradicting the characteristic finding of **thrombocytopenia** found in TTP [1]. - While other features align with TTP's clinical picture, the thrombocytosis excludes this option from being correct [2]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 947-948. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 667-668.

Question 6: A patient who presented with blunt abdominal injury underwent complete repair of liver and was given transfusion of 12 units of whole blood. Thereafter, it is found that the wound is bleeding. It is treated by

A. Vitamin-K
B. Platelet concentrates (Correct Answer)
C. Calcium gluconate/calcium chloride
D. Fresh Frozen Plasma

Explanation: ***Platelet concentrates*** - Transfusion of **large volumes of whole blood** can lead to **dilutional coagulopathy**, primarily affecting platelet count and function. - The most effective immediate treatment for bleeding due to dilutional coagulopathy after massive transfusion is the administration of **platelet concentrates** to replenish platelet levels. *Vitamin-K* - **Vitamin-K** is essential for the synthesis of **coagulation factors II, VII, IX, and X** in the liver. - Its administration is typically indicated for patients with **warfarin overdose** or **liver dysfunction**, neither of which is the primary cause of bleeding in this scenario. *Calcium gluconate/calcium chloride* - **Calcium** is an important cofactor in several steps of the coagulation cascade. - While citrate in transfused blood can chelate calcium, significant **symptomatic hypocalcemia** affecting coagulation is less common and usually does not manifest as persistent surgical site bleeding. *Fresh Frozen Plasma* - **Fresh Frozen Plasma (FFP)** provides a broad spectrum of **coagulation factors**, addressing deficiencies in clotting factors. - While FFP can be helpful in massive transfusion protocols, the primary issue after 12 units of whole blood is often **dilutional thrombocytopenia**, making platelet concentrates a more direct and effective initial treatment for sustained bleeding.

Question 7: All of the following are major complications of massive transfusion, except:

A. Hypothermia
B. Hypokalemia (Correct Answer)
C. Hypocalcemia
D. Hypomagnesemia

Explanation: ***Hypokalemia*** - **Massive transfusion** typically causes **hyperkalemia** due to the leakage of potassium from stored red blood cells, not hypokalemia. - The breakdown of red blood cells in stored blood releases intracellular potassium, which can accumulate to dangerous levels during rapid or large-volume transfusions. *Hypothermia* - Infusion of large volumes of **cold blood products** directly contributes to lowering the patient's core body temperature. - This complication is mitigated by using **blood warmers** during massive transfusions. *Hypomagnesemia* - The citrate used as an anticoagulant in stored blood binds to magnesium, forming **citrate-magnesium complexes**, leading to decreased ionized magnesium levels. - This **chelation effect** can result in **hypomagnesemia**, which can affect cardiac function. *Hypocalcemia* - Similarly, **citrate** in transfused blood binds to **calcium**, reducing the amount of free, ionized calcium in the patient's circulation. - This **citrate toxicity** can cause **hypocalcemia**, leading to cardiac dysfunction and coagulopathy.

Question 8: In a post-operative patient, 21 years old with a weight of 70 kg, what is the expected increase in hematocrit after transfusion of 1 unit of packed RBC?

A. 1%
B. 3-5% (Correct Answer)
C. 10%
D. 15%

Explanation: ***3-5%*** - A general rule of thumb is that one unit of **packed red blood cells (PRBCs)** will typically raise the **hematocrit** by 3-5% (or the hemoglobin by 1 g/dL) in a 70 kg adult. - This patient, being 21 years old and 70 kg, fits the standard adult profile for which this estimation holds true. *1%* - An increase of only 1% in hematocrit after one unit of PRBCs is typically too low and would suggest either **ongoing hemorrhage**, a technical error, or rapid destruction of transfused red blood cells. - This magnitude of increase is not the expected therapeutic effect for a single unit in a stable adult. *10%* - A 10% increase in hematocrit after one unit of PRBCs is generally higher than expected, indicating a more significant response. - While possible in some specific clinical scenarios, it is not the standard or average expected increase. *15%* - A 15% increase in hematocrit is a very substantial rise, far exceeding the typical response to a single unit of PRBCs. - Such an increase would usually require multiple units of blood or be indicative of an erroneous measurement.

Question 9: Which one of the following is NOT a complication of massive blood transfusion?

A. Hyperthermia (Correct Answer)
B. Hyperkalemia
C. Hypocalcaemia
D. Coagulopathy

Explanation: ***Hyperthermia*** - **Hypothermia** is a more common complication of massive blood transfusion due to the administration of large volumes of cold blood products. - While theoretical, hyperthermia in this context would be rare and not a direct complication of the blood components themselves, unless equipment malfunction or infection occurs. [1] *Hyperkalemia* - Stored red blood cells **leak potassium** as they age, leading to higher potassium levels in the transfusion product. - Rapid infusion of large volumes can overwhelm the body's compensatory mechanisms, resulting in **elevated serum potassium**. *Hypocalcaemia* - **Citrate**, an anticoagulant used in blood storage, binds to ionized calcium in the recipient's blood. - Massive transfusions can lead to significant citrate accumulation, causing a drop in **ionized calcium levels**. *Coagulopathy* - Massive transfusions dilute clotting factors and platelets, which are not proportionally replaced in standard transfusion protocols. - This dilution can lead to impaired **hemostasis** and increased bleeding tendencies. [1]

Question 10: Which of the following is NOT a recognized complication of massive blood transfusion?

A. Hypothermia
B. Hypokalemia
C. Hypernatremia (Correct Answer)
D. Hypocalcemia

Explanation: ***Hypernatremia*** - Massive blood transfusions typically lead to **hyponatremia** rather than hypernatremia, primarily due to the dilutional effect of transfused fluids and the metabolism of citrate. - The sodium concentration in most blood products is similar to or slightly lower than physiological levels, making hypernatremia an unlikely complication. *Hypothermia* - Administering large volumes of refrigerated blood products can significantly lower the patient's core body temperature, leading to **hypothermia**. - This complication can impair coagulation and cardiac function, necessitating the use of blood warmers. *Hypokalemia* - Stored red blood cells can leak potassium into the storage solution, leading to **hyperkalemia** upon transfusion of older units. However, patients receiving massive transfusions often develop **hypokalemia** due to intracellular shift of potassium as a result of alkalosis from citrate metabolism and increased cellular uptake. - Furthermore, potassium can be depleted from the blood products during storage if they are stored for extended periods, and in the setting of ongoing blood loss and shifts. *Hypocalcemia* - **Citrate**, an anticoagulant in stored blood, binds to endogenous calcium, forming calcium citrate complexes. - Rapid, massive transfusion can overwhelm the liver's capacity to metabolize citrate, leading to a functional **hypocalcemia** due to decreased ionized calcium levels. [1]

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