ATLS Trauma in Anticoagulated Patients
Practice Exam Questions And Correct
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Rationales 2026 Q&A Instant Download
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1. A 72-year-old patient taking warfarin for atrial fibrillation is brought to the
emergency department after a motor vehicle collision. He is hypotensive
and has abdominal tenderness. What is the most important initial priority?
A. Obtain a complete medication history
B. Reverse the anticoagulation immediately
C. Perform the primary survey and address life-threatening injuries
D. Obtain a computed tomography scan of the abdomen
Answer: C. Perform the primary survey and address life-threatening injuries
Rationale: In ATLS care, the primary survey and immediate treatment of life-
threatening problems take priority. Anticoagulation reversal is important but
should occur concurrently when significant bleeding is suspected rather than
delaying airway, breathing, or circulation management.
2. Which anticoagulant most directly inhibits thrombin?
A. Warfarin
B. Dabigatran
,C. Apixaban
D. Rivaroxaban
Answer: B. Dabigatran
Rationale: Dabigatran is a direct thrombin inhibitor. Apixaban and rivaroxaban
directly inhibit factor Xa, whereas warfarin reduces synthesis of several vitamin
K-dependent coagulation factors.
3. A patient taking warfarin presents after a fall with altered mental status.
What injury should be strongly suspected even if the initial examination is
relatively reassuring?
A. Intracranial hemorrhage
B. Isolated rib fracture
C. Distal radius fracture
D. Superficial scalp abrasion
Answer: A. Intracranial hemorrhage
Rationale: Anticoagulation increases the risk of clinically significant intracranial
bleeding after trauma. A low threshold for head imaging and anticoagulation
assessment is appropriate.
4. Which laboratory test is routinely used to assess the anticoagulant effect of
warfarin?
A. Activated partial thromboplastin time
B. Thrombin time
C. Fibrinogen level
D. International normalized ratio
Answer: D. International normalized ratio
Rationale: The international normalized ratio is the standard laboratory
measure used to assess the effect of warfarin.
5. A trauma patient taking warfarin has life-threatening hemorrhage. Which
reversal strategy is generally preferred for rapid reversal?
,A. Oral vitamin K alone
B. Fresh frozen plasma alone
C. Four-factor prothrombin complex concentrate with intravenous vitamin K
D. Platelet transfusion alone
Answer: C. Four-factor prothrombin complex concentrate with intravenous
vitamin K
Rationale: Four-factor prothrombin complex concentrate provides rapid
replacement of vitamin K-dependent factors, while intravenous vitamin K
provides sustained correction by promoting new factor synthesis.
6. Why is vitamin K alone inadequate for immediate reversal of severe
warfarin-associated bleeding?
A. It increases fibrinolysis
B. It requires time for new clotting-factor synthesis
C. It directly inhibits thrombin
D. It causes platelet dysfunction
Answer: B. It requires time for new clotting-factor synthesis
Rationale: Vitamin K restores hepatic synthesis of vitamin K-dependent factors
but does not immediately replace already depleted circulating factors.
7. A patient taking apixaban develops traumatic intracranial hemorrhage.
Apixaban primarily inhibits which coagulation factor?
A. Factor Xa
B. Factor VII
C. Factor VIII
D. Thrombin
Answer: A. Factor Xa
Rationale: Apixaban is a direct factor Xa inhibitor.
8. Which medication is a specific reversal agent for dabigatran?
, A. Protamine
B. Vitamin K
C. Idarucizumab
D. Desmopressin
Answer: C. Idarucizumab
Rationale: Idarucizumab is a specific monoclonal antibody fragment that binds
dabigatran and rapidly reverses its anticoagulant effect.
9. Which anticoagulant is reversed with protamine sulfate?
A. Dabigatran
B. Unfractionated heparin
C. Warfarin
D. Apixaban
Answer: B. Unfractionated heparin
Rationale: Protamine is an effective reversal agent for unfractionated heparin.
Its effect on low-molecular-weight heparin is incomplete.
10.A patient taking low-molecular-weight heparin develops life-threatening
traumatic bleeding. What is true regarding protamine?
A. It completely reverses all low-molecular-weight heparin activity
B. It has no effect on low-molecular-weight heparin
C. It provides partial reversal
D. It is contraindicated in all cases
Answer: C. It provides partial reversal
Rationale: Protamine can partially neutralize low-molecular-weight heparin, but
anti-factor Xa activity may persist.
11.What is the most important concern regarding anticoagulation in a patient
with major trauma?
A. Increased risk of occult and uncontrolled hemorrhage
B. Increased risk of hyperglycemia
Practice Exam Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A Instant Download
1. A 72-year-old patient taking warfarin for atrial fibrillation is brought to the
emergency department after a motor vehicle collision. He is hypotensive
and has abdominal tenderness. What is the most important initial priority?
A. Obtain a complete medication history
B. Reverse the anticoagulation immediately
C. Perform the primary survey and address life-threatening injuries
D. Obtain a computed tomography scan of the abdomen
Answer: C. Perform the primary survey and address life-threatening injuries
Rationale: In ATLS care, the primary survey and immediate treatment of life-
threatening problems take priority. Anticoagulation reversal is important but
should occur concurrently when significant bleeding is suspected rather than
delaying airway, breathing, or circulation management.
2. Which anticoagulant most directly inhibits thrombin?
A. Warfarin
B. Dabigatran
,C. Apixaban
D. Rivaroxaban
Answer: B. Dabigatran
Rationale: Dabigatran is a direct thrombin inhibitor. Apixaban and rivaroxaban
directly inhibit factor Xa, whereas warfarin reduces synthesis of several vitamin
K-dependent coagulation factors.
3. A patient taking warfarin presents after a fall with altered mental status.
What injury should be strongly suspected even if the initial examination is
relatively reassuring?
A. Intracranial hemorrhage
B. Isolated rib fracture
C. Distal radius fracture
D. Superficial scalp abrasion
Answer: A. Intracranial hemorrhage
Rationale: Anticoagulation increases the risk of clinically significant intracranial
bleeding after trauma. A low threshold for head imaging and anticoagulation
assessment is appropriate.
4. Which laboratory test is routinely used to assess the anticoagulant effect of
warfarin?
A. Activated partial thromboplastin time
B. Thrombin time
C. Fibrinogen level
D. International normalized ratio
Answer: D. International normalized ratio
Rationale: The international normalized ratio is the standard laboratory
measure used to assess the effect of warfarin.
5. A trauma patient taking warfarin has life-threatening hemorrhage. Which
reversal strategy is generally preferred for rapid reversal?
,A. Oral vitamin K alone
B. Fresh frozen plasma alone
C. Four-factor prothrombin complex concentrate with intravenous vitamin K
D. Platelet transfusion alone
Answer: C. Four-factor prothrombin complex concentrate with intravenous
vitamin K
Rationale: Four-factor prothrombin complex concentrate provides rapid
replacement of vitamin K-dependent factors, while intravenous vitamin K
provides sustained correction by promoting new factor synthesis.
6. Why is vitamin K alone inadequate for immediate reversal of severe
warfarin-associated bleeding?
A. It increases fibrinolysis
B. It requires time for new clotting-factor synthesis
C. It directly inhibits thrombin
D. It causes platelet dysfunction
Answer: B. It requires time for new clotting-factor synthesis
Rationale: Vitamin K restores hepatic synthesis of vitamin K-dependent factors
but does not immediately replace already depleted circulating factors.
7. A patient taking apixaban develops traumatic intracranial hemorrhage.
Apixaban primarily inhibits which coagulation factor?
A. Factor Xa
B. Factor VII
C. Factor VIII
D. Thrombin
Answer: A. Factor Xa
Rationale: Apixaban is a direct factor Xa inhibitor.
8. Which medication is a specific reversal agent for dabigatran?
, A. Protamine
B. Vitamin K
C. Idarucizumab
D. Desmopressin
Answer: C. Idarucizumab
Rationale: Idarucizumab is a specific monoclonal antibody fragment that binds
dabigatran and rapidly reverses its anticoagulant effect.
9. Which anticoagulant is reversed with protamine sulfate?
A. Dabigatran
B. Unfractionated heparin
C. Warfarin
D. Apixaban
Answer: B. Unfractionated heparin
Rationale: Protamine is an effective reversal agent for unfractionated heparin.
Its effect on low-molecular-weight heparin is incomplete.
10.A patient taking low-molecular-weight heparin develops life-threatening
traumatic bleeding. What is true regarding protamine?
A. It completely reverses all low-molecular-weight heparin activity
B. It has no effect on low-molecular-weight heparin
C. It provides partial reversal
D. It is contraindicated in all cases
Answer: C. It provides partial reversal
Rationale: Protamine can partially neutralize low-molecular-weight heparin, but
anti-factor Xa activity may persist.
11.What is the most important concern regarding anticoagulation in a patient
with major trauma?
A. Increased risk of occult and uncontrolled hemorrhage
B. Increased risk of hyperglycemia
