ATLS Trauma-Induced Coagulopathy
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1. Which mechanism is most directly responsible for trauma-induced
coagulopathy occurring soon after severe injury?
A. Isolated vitamin K deficiency
B. Tissue injury, shock, endothelial dysfunction, and dysregulated
coagulation
C. Chronic liver disease
D. Excessive platelet production
Answer: B. Tissue injury, shock, endothelial dysfunction, and
dysregulated coagulation
Rationale: Trauma-induced coagulopathy develops from a complex
interaction among tissue injury, hypoperfusion, endothelial activation,
anticoagulant pathways, fibrinolysis, platelet dysfunction, and
subsequent dilutional and consumptive effects.
2. Which clinical finding most strongly suggests significant traumatic
hemorrhage?
A. Warm skin and normal pulse
B. Persistent tachycardia with hypotension and altered mentation
C. Mild isolated hypertension
D. Bradycardia with normal perfusion
,Answer: B. Persistent tachycardia with hypotension and altered
mentation
Rationale: Tachycardia, hypotension, altered mental status, and poor
peripheral perfusion are important indicators of hemorrhagic shock
and should prompt rapid hemorrhage-control and resuscitation
measures.
3. What is a major early driver of trauma-induced coagulopathy?
A. Tissue hypoperfusion
B. Hyperglycemia alone
C. Hypercalcemia
D. Increased erythropoiesis
Answer: A. Tissue hypoperfusion
Rationale: Hypoperfusion activates endothelial and anticoagulant
pathways and contributes to impaired thrombin generation and
abnormal fibrinolysis. It is a central component of early trauma-
induced coagulopathy.
4. Which combination is classically associated with worsening
coagulopathy during severe trauma?
A. Hypothermia, acidosis, and coagulopathy
B. Hypertension, alkalosis, and hyperthermia
C. Hypernatremia, alkalosis, and thrombocytosis
D. Hypercalcemia, fever, and alkalosis
Answer: A. Hypothermia, acidosis, and coagulopathy
Rationale: Hypothermia and acidosis impair enzymatic coagulation
and platelet function, while coagulopathy itself promotes further
bleeding. These abnormalities can reinforce one another during
uncontrolled hemorrhage.
, 5. What is the most important immediate priority in a trauma patient
with life-threatening bleeding?
A. Correct the hemoglobin before controlling hemorrhage
B. Obtain a complete coagulation panel before intervention
C. Control the source of hemorrhage
D. Administer large volumes of crystalloid
Answer: C. Control the source of hemorrhage
Rationale: Definitive hemorrhage control is fundamental.
Resuscitation supports the patient but cannot substitute for stopping
the bleeding source through appropriate surgical, interventional,
mechanical, or other definitive measures.
6. Which component of blood provides the primary substrate for
formation of fibrin?
A. Albumin
B. Fibrinogen
C. Hemoglobin
D. Immunoglobulin
Answer: B. Fibrinogen
Rationale: Fibrinogen is converted to fibrin by thrombin and forms
the structural framework of the developing clot. Severe hemorrhage
can rapidly produce clinically important hypofibrinogenemia.
7. Which laboratory test specifically measures fibrinogen
concentration when performed by the Clauss method?
A. PT
B. aPTT
C. Clauss fibrinogen assay
D. INR
, Answer: C. Clauss fibrinogen assay
Rationale: The Clauss assay is a functional fibrinogen measurement.
Fibrinogen concentration is particularly important in major trauma
because low levels are associated with impaired clot strength and
severe bleeding.
8. A severely injured patient has ongoing bleeding and a fibrinogen
concentration of 1.2 g/L. Which therapy is most appropriate to
address the fibrinogen deficit?
A. Fibrinogen replacement
B. Insulin infusion
C. Potassium replacement only
D. Albumin infusion
Answer: A. Fibrinogen replacement
Rationale: Major bleeding accompanied by significant
hypofibrinogenemia warrants fibrinogen replacement with an
appropriate blood component or fibrinogen concentrate according to
institutional protocols and available resources.
9. Which blood component contains substantial fibrinogen and is
commonly used to replace fibrinogen?
A. Cryoprecipitate
B. Red blood cells
C. Albumin
D. Normal saline
Answer: A. Cryoprecipitate
Rationale: Cryoprecipitate is rich in fibrinogen and also contains
factor VIII, von Willebrand factor, factor XIII, and fibronectin. It can
be used when rapid fibrinogen replacement is required.
Practice Exam Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. Which mechanism is most directly responsible for trauma-induced
coagulopathy occurring soon after severe injury?
A. Isolated vitamin K deficiency
B. Tissue injury, shock, endothelial dysfunction, and dysregulated
coagulation
C. Chronic liver disease
D. Excessive platelet production
Answer: B. Tissue injury, shock, endothelial dysfunction, and
dysregulated coagulation
Rationale: Trauma-induced coagulopathy develops from a complex
interaction among tissue injury, hypoperfusion, endothelial activation,
anticoagulant pathways, fibrinolysis, platelet dysfunction, and
subsequent dilutional and consumptive effects.
2. Which clinical finding most strongly suggests significant traumatic
hemorrhage?
A. Warm skin and normal pulse
B. Persistent tachycardia with hypotension and altered mentation
C. Mild isolated hypertension
D. Bradycardia with normal perfusion
,Answer: B. Persistent tachycardia with hypotension and altered
mentation
Rationale: Tachycardia, hypotension, altered mental status, and poor
peripheral perfusion are important indicators of hemorrhagic shock
and should prompt rapid hemorrhage-control and resuscitation
measures.
3. What is a major early driver of trauma-induced coagulopathy?
A. Tissue hypoperfusion
B. Hyperglycemia alone
C. Hypercalcemia
D. Increased erythropoiesis
Answer: A. Tissue hypoperfusion
Rationale: Hypoperfusion activates endothelial and anticoagulant
pathways and contributes to impaired thrombin generation and
abnormal fibrinolysis. It is a central component of early trauma-
induced coagulopathy.
4. Which combination is classically associated with worsening
coagulopathy during severe trauma?
A. Hypothermia, acidosis, and coagulopathy
B. Hypertension, alkalosis, and hyperthermia
C. Hypernatremia, alkalosis, and thrombocytosis
D. Hypercalcemia, fever, and alkalosis
Answer: A. Hypothermia, acidosis, and coagulopathy
Rationale: Hypothermia and acidosis impair enzymatic coagulation
and platelet function, while coagulopathy itself promotes further
bleeding. These abnormalities can reinforce one another during
uncontrolled hemorrhage.
, 5. What is the most important immediate priority in a trauma patient
with life-threatening bleeding?
A. Correct the hemoglobin before controlling hemorrhage
B. Obtain a complete coagulation panel before intervention
C. Control the source of hemorrhage
D. Administer large volumes of crystalloid
Answer: C. Control the source of hemorrhage
Rationale: Definitive hemorrhage control is fundamental.
Resuscitation supports the patient but cannot substitute for stopping
the bleeding source through appropriate surgical, interventional,
mechanical, or other definitive measures.
6. Which component of blood provides the primary substrate for
formation of fibrin?
A. Albumin
B. Fibrinogen
C. Hemoglobin
D. Immunoglobulin
Answer: B. Fibrinogen
Rationale: Fibrinogen is converted to fibrin by thrombin and forms
the structural framework of the developing clot. Severe hemorrhage
can rapidly produce clinically important hypofibrinogenemia.
7. Which laboratory test specifically measures fibrinogen
concentration when performed by the Clauss method?
A. PT
B. aPTT
C. Clauss fibrinogen assay
D. INR
, Answer: C. Clauss fibrinogen assay
Rationale: The Clauss assay is a functional fibrinogen measurement.
Fibrinogen concentration is particularly important in major trauma
because low levels are associated with impaired clot strength and
severe bleeding.
8. A severely injured patient has ongoing bleeding and a fibrinogen
concentration of 1.2 g/L. Which therapy is most appropriate to
address the fibrinogen deficit?
A. Fibrinogen replacement
B. Insulin infusion
C. Potassium replacement only
D. Albumin infusion
Answer: A. Fibrinogen replacement
Rationale: Major bleeding accompanied by significant
hypofibrinogenemia warrants fibrinogen replacement with an
appropriate blood component or fibrinogen concentrate according to
institutional protocols and available resources.
9. Which blood component contains substantial fibrinogen and is
commonly used to replace fibrinogen?
A. Cryoprecipitate
B. Red blood cells
C. Albumin
D. Normal saline
Answer: A. Cryoprecipitate
Rationale: Cryoprecipitate is rich in fibrinogen and also contains
factor VIII, von Willebrand factor, factor XIII, and fibronectin. It can
be used when rapid fibrinogen replacement is required.
