ATLS Hypothermia, Acidosis and
Coagulopathy Practice Exam
Questions And Correct Answers
(Verified Answers) Plus Rationales
2026 Q&A | Instant Download Pdf
1. A severely injured patient arrives after prolonged exposure to cold
weather. His core temperature is 34°C, blood pressure is 88/54
mmHg, and he is confused. Which component of the trauma triad
of death is already present?
A. Hyperthermia
B. Metabolic alkalosis
C. Hypothermia
D. Hypernatremia
Answer: Hypothermia
Rationale: Hypothermia is a core component of the trauma lethal
triad, along with acidosis and coagulopathy. Even mild hypothermia
after major trauma can impair coagulation and cardiovascular
function.
2. Which combination constitutes the classic lethal triad associated
with severe traumatic hemorrhage?
A. Hypertension, alkalosis, and thrombocytosis
B. Hypothermia, acidosis, and coagulopathy
C. Hyperthermia, alkalosis, and leukocytosis
D. Hypoglycemia, hypernatremia, and alkalosis
,Answer: Hypothermia, acidosis, and coagulopathy
Rationale: The lethal triad describes hypothermia, metabolic acidosis,
and trauma-induced coagulopathy. These processes reinforce one
another and are associated with increased mortality.
3. A trauma patient develops worsening hypotension and metabolic
acidosis despite initial fluid administration. What underlying
process should be strongly suspected?
A. Excessive oxygen delivery
B. Inadequate tissue perfusion
C. Respiratory alkalosis
D. Isolated hyperventilation
Answer: Inadequate tissue perfusion
Rationale: Shock reduces tissue oxygen delivery, promoting anaerobic
metabolism and lactate production. Persistent hypoperfusion therefore
contributes directly to metabolic acidosis.
4. Which temperature best defines clinically significant hypothermia
in a trauma patient?
A. 38°C
B. 37°C
C. 35°C
D. Less than 35°C
Answer: Less than 35°C
Rationale: Hypothermia is generally defined as a core temperature
below 35°C. Trauma patients are particularly vulnerable because
exposure, shock, and administration of cold fluids can accelerate heat
loss.
, 5. Which mechanism most directly contributes to trauma-induced
coagulopathy during severe shock?
A. Increased platelet production
B. Increased fibrinogen synthesis
C. Tissue hypoperfusion and endothelial injury
D. Increased clotting-factor activation without limitation
Answer: Tissue hypoperfusion and endothelial injury
Rationale: Severe trauma and shock alter endothelial function,
anticoagulant pathways, fibrinolysis, and platelet activity.
Hypoperfusion-associated coagulopathy can develop early, before
substantial dilution occurs.
6. Which intervention is most appropriate for preventing hypothermia
during trauma resuscitation?
A. Exposing the patient completely throughout resuscitation
B. Administering large volumes of refrigerated crystalloid
C. Using active warming and warmed intravenous fluids
D. Delaying hemorrhage control until temperature normalizes
Answer: Using active warming and warmed intravenous fluids
Rationale: Prevention of further heat loss is essential. Environmental
warming, forced-air warming when appropriate, warmed blood
products, and warmed intravenous fluids help maintain core
temperature.
7. A patient with hemorrhagic shock has a lactate of 8 mmol/L. What
does this finding most strongly indicate?
A. Adequate tissue perfusion
B. Primary respiratory alkalosis
, C. Significant oxygen debt and tissue hypoperfusion
D. Isolated renal failure
Answer: Significant oxygen debt and tissue hypoperfusion
Rationale: Elevated lactate commonly reflects increased anaerobic
metabolism caused by inadequate oxygen delivery. In trauma,
persistent hyperlactatemia can indicate ongoing shock and inadequate
resuscitation.
8. Which acid-base abnormality is most characteristic of severe
hemorrhagic shock?
A. Metabolic alkalosis
B. Respiratory acidosis alone
C. Metabolic acidosis
D. Chronic respiratory alkalosis
Answer: Metabolic acidosis
Rationale: Hemorrhagic shock reduces oxygen delivery to tissues,
increasing anaerobic metabolism and lactate generation. This
produces metabolic acidosis.
9. Why does hypothermia worsen coagulopathy in severely injured
patients?
A. It increases platelet function
B. It accelerates enzymatic coagulation reactions
C. It impairs platelet function and coagulation enzyme activity
D. It increases fibrinogen production
Answer: It impairs platelet function and coagulation enzyme
activity
Coagulopathy Practice Exam
Questions And Correct Answers
(Verified Answers) Plus Rationales
2026 Q&A | Instant Download Pdf
1. A severely injured patient arrives after prolonged exposure to cold
weather. His core temperature is 34°C, blood pressure is 88/54
mmHg, and he is confused. Which component of the trauma triad
of death is already present?
A. Hyperthermia
B. Metabolic alkalosis
C. Hypothermia
D. Hypernatremia
Answer: Hypothermia
Rationale: Hypothermia is a core component of the trauma lethal
triad, along with acidosis and coagulopathy. Even mild hypothermia
after major trauma can impair coagulation and cardiovascular
function.
2. Which combination constitutes the classic lethal triad associated
with severe traumatic hemorrhage?
A. Hypertension, alkalosis, and thrombocytosis
B. Hypothermia, acidosis, and coagulopathy
C. Hyperthermia, alkalosis, and leukocytosis
D. Hypoglycemia, hypernatremia, and alkalosis
,Answer: Hypothermia, acidosis, and coagulopathy
Rationale: The lethal triad describes hypothermia, metabolic acidosis,
and trauma-induced coagulopathy. These processes reinforce one
another and are associated with increased mortality.
3. A trauma patient develops worsening hypotension and metabolic
acidosis despite initial fluid administration. What underlying
process should be strongly suspected?
A. Excessive oxygen delivery
B. Inadequate tissue perfusion
C. Respiratory alkalosis
D. Isolated hyperventilation
Answer: Inadequate tissue perfusion
Rationale: Shock reduces tissue oxygen delivery, promoting anaerobic
metabolism and lactate production. Persistent hypoperfusion therefore
contributes directly to metabolic acidosis.
4. Which temperature best defines clinically significant hypothermia
in a trauma patient?
A. 38°C
B. 37°C
C. 35°C
D. Less than 35°C
Answer: Less than 35°C
Rationale: Hypothermia is generally defined as a core temperature
below 35°C. Trauma patients are particularly vulnerable because
exposure, shock, and administration of cold fluids can accelerate heat
loss.
, 5. Which mechanism most directly contributes to trauma-induced
coagulopathy during severe shock?
A. Increased platelet production
B. Increased fibrinogen synthesis
C. Tissue hypoperfusion and endothelial injury
D. Increased clotting-factor activation without limitation
Answer: Tissue hypoperfusion and endothelial injury
Rationale: Severe trauma and shock alter endothelial function,
anticoagulant pathways, fibrinolysis, and platelet activity.
Hypoperfusion-associated coagulopathy can develop early, before
substantial dilution occurs.
6. Which intervention is most appropriate for preventing hypothermia
during trauma resuscitation?
A. Exposing the patient completely throughout resuscitation
B. Administering large volumes of refrigerated crystalloid
C. Using active warming and warmed intravenous fluids
D. Delaying hemorrhage control until temperature normalizes
Answer: Using active warming and warmed intravenous fluids
Rationale: Prevention of further heat loss is essential. Environmental
warming, forced-air warming when appropriate, warmed blood
products, and warmed intravenous fluids help maintain core
temperature.
7. A patient with hemorrhagic shock has a lactate of 8 mmol/L. What
does this finding most strongly indicate?
A. Adequate tissue perfusion
B. Primary respiratory alkalosis
, C. Significant oxygen debt and tissue hypoperfusion
D. Isolated renal failure
Answer: Significant oxygen debt and tissue hypoperfusion
Rationale: Elevated lactate commonly reflects increased anaerobic
metabolism caused by inadequate oxygen delivery. In trauma,
persistent hyperlactatemia can indicate ongoing shock and inadequate
resuscitation.
8. Which acid-base abnormality is most characteristic of severe
hemorrhagic shock?
A. Metabolic alkalosis
B. Respiratory acidosis alone
C. Metabolic acidosis
D. Chronic respiratory alkalosis
Answer: Metabolic acidosis
Rationale: Hemorrhagic shock reduces oxygen delivery to tissues,
increasing anaerobic metabolism and lactate generation. This
produces metabolic acidosis.
9. Why does hypothermia worsen coagulopathy in severely injured
patients?
A. It increases platelet function
B. It accelerates enzymatic coagulation reactions
C. It impairs platelet function and coagulation enzyme activity
D. It increases fibrinogen production
Answer: It impairs platelet function and coagulation enzyme
activity
