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ATLS Perfusion Monitoring in Trauma
Practice Exam Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A Instant Download
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1. A trauma patient arrives with cool skin, delayed capillary refill, and
tachycardia despite a normal systolic blood pressure. Which condition is
most concerning?
A. Stable compensated shock
B. Neurogenic hypertension
C. Compensated hemorrhagic shock
D. Chronic hypertension
Answer: C. Compensated hemorrhagic shock
Rationale: Perfusion may be significantly impaired before hypotension develops.
Tachycardia, cool extremities, and delayed capillary refill can indicate
compensated hemorrhagic shock despite a normal systolic blood pressure.
2. Which parameter is most useful for evaluating the adequacy of end-organ
perfusion over time in an adult trauma patient?
,A. Heart rate alone
B. Urine output
C. Respiratory rate alone
D. Body temperature
Answer: B. Urine output
Rationale: Urine output is a practical indicator of renal perfusion and overall
resuscitation adequacy when interpreted with the patient's clinical condition.
3. In most adult trauma patients, an appropriate urine output goal during
resuscitation is approximately:
A. 0.1 mL/kg/hour
B. 0.25 mL/kg/hour
C. 0.5 mL/kg/hour
D. 2 mL/kg/hour
Answer: C. 0.5 mL/kg/hour
Rationale: A commonly used target for adequate urine output in adult trauma
resuscitation is approximately 0.5 mL/kg/hour.
4. Which finding may indicate inadequate tissue perfusion despite an
apparently acceptable blood pressure?
A. Warm extremities and improving mental status
B. Increasing serum lactate concentration
C. Stable urine output
D. Improving base deficit
Answer: B. Increasing serum lactate concentration
Rationale: Rising lactate can indicate ongoing tissue hypoperfusion and
anaerobic metabolism, although it must be interpreted in the full clinical
context.
5. Base deficit is primarily used in trauma to help assess:
,A. Intracranial pressure
B. Oxygen saturation
C. The severity of metabolic derangement associated with shock and
hypoperfusion
D. Pulmonary compliance
Answer: C. The severity of metabolic derangement associated with shock and
hypoperfusion
Rationale: Base deficit helps estimate the degree of metabolic acidosis and can
assist in assessing the severity of shock and monitoring response to
resuscitation.
6. Which change most strongly suggests improving global perfusion during
serial trauma assessments?
A. Increasing lactate
B. Worsening mental status
C. Falling urine output
D. Improving base deficit toward normal
Answer: D. Improving base deficit toward normal
Rationale: Improvement of the base deficit toward normal may indicate
correction of metabolic acidosis and improving tissue perfusion.
7. A trauma patient has altered mental status, tachycardia, and cool
extremities. What should the clinician consider first?
A. The patient is adequately perfused because blood pressure is normal
B. Shock with inadequate tissue perfusion
C. Chronic anxiety
D. Normal physiologic adaptation
Answer: B. Shock with inadequate tissue perfusion
Rationale: Altered mental status, tachycardia, and peripheral vasoconstriction
are concerning findings for inadequate perfusion and possible shock.
, 8. Which monitoring method directly measures arterial oxygen saturation?
A. Capnography
B. Central venous pressure
C. Pulse oximetry
D. Urine output monitoring
Answer: C. Pulse oximetry
Rationale: Pulse oximetry provides a noninvasive estimate of arterial
hemoglobin oxygen saturation, although accuracy may be affected by poor
peripheral perfusion.
9. Poor peripheral perfusion may make which monitoring device less reliable?
A. Foley catheter
B. Electrocardiogram
C. Pulse oximeter
D. Core temperature probe
Answer: C. Pulse oximeter
Rationale: Severe vasoconstriction and poor peripheral blood flow can reduce
the accuracy or availability of pulse oximetry readings.
10.Which parameter is calculated by subtracting diastolic blood pressure from
systolic blood pressure?
A. Mean arterial pressure
B. Shock index
C. Central venous pressure
D. Pulse pressure
Answer: D. Pulse pressure
Rationale: Pulse pressure equals systolic blood pressure minus diastolic blood
pressure. A narrowing pulse pressure may occur with reduced stroke volume and
worsening shock.
11.Shock index is calculated as:
ATLS Perfusion Monitoring in Trauma
Practice Exam Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A Instant Download
___________________________________________________________________
1. A trauma patient arrives with cool skin, delayed capillary refill, and
tachycardia despite a normal systolic blood pressure. Which condition is
most concerning?
A. Stable compensated shock
B. Neurogenic hypertension
C. Compensated hemorrhagic shock
D. Chronic hypertension
Answer: C. Compensated hemorrhagic shock
Rationale: Perfusion may be significantly impaired before hypotension develops.
Tachycardia, cool extremities, and delayed capillary refill can indicate
compensated hemorrhagic shock despite a normal systolic blood pressure.
2. Which parameter is most useful for evaluating the adequacy of end-organ
perfusion over time in an adult trauma patient?
,A. Heart rate alone
B. Urine output
C. Respiratory rate alone
D. Body temperature
Answer: B. Urine output
Rationale: Urine output is a practical indicator of renal perfusion and overall
resuscitation adequacy when interpreted with the patient's clinical condition.
3. In most adult trauma patients, an appropriate urine output goal during
resuscitation is approximately:
A. 0.1 mL/kg/hour
B. 0.25 mL/kg/hour
C. 0.5 mL/kg/hour
D. 2 mL/kg/hour
Answer: C. 0.5 mL/kg/hour
Rationale: A commonly used target for adequate urine output in adult trauma
resuscitation is approximately 0.5 mL/kg/hour.
4. Which finding may indicate inadequate tissue perfusion despite an
apparently acceptable blood pressure?
A. Warm extremities and improving mental status
B. Increasing serum lactate concentration
C. Stable urine output
D. Improving base deficit
Answer: B. Increasing serum lactate concentration
Rationale: Rising lactate can indicate ongoing tissue hypoperfusion and
anaerobic metabolism, although it must be interpreted in the full clinical
context.
5. Base deficit is primarily used in trauma to help assess:
,A. Intracranial pressure
B. Oxygen saturation
C. The severity of metabolic derangement associated with shock and
hypoperfusion
D. Pulmonary compliance
Answer: C. The severity of metabolic derangement associated with shock and
hypoperfusion
Rationale: Base deficit helps estimate the degree of metabolic acidosis and can
assist in assessing the severity of shock and monitoring response to
resuscitation.
6. Which change most strongly suggests improving global perfusion during
serial trauma assessments?
A. Increasing lactate
B. Worsening mental status
C. Falling urine output
D. Improving base deficit toward normal
Answer: D. Improving base deficit toward normal
Rationale: Improvement of the base deficit toward normal may indicate
correction of metabolic acidosis and improving tissue perfusion.
7. A trauma patient has altered mental status, tachycardia, and cool
extremities. What should the clinician consider first?
A. The patient is adequately perfused because blood pressure is normal
B. Shock with inadequate tissue perfusion
C. Chronic anxiety
D. Normal physiologic adaptation
Answer: B. Shock with inadequate tissue perfusion
Rationale: Altered mental status, tachycardia, and peripheral vasoconstriction
are concerning findings for inadequate perfusion and possible shock.
, 8. Which monitoring method directly measures arterial oxygen saturation?
A. Capnography
B. Central venous pressure
C. Pulse oximetry
D. Urine output monitoring
Answer: C. Pulse oximetry
Rationale: Pulse oximetry provides a noninvasive estimate of arterial
hemoglobin oxygen saturation, although accuracy may be affected by poor
peripheral perfusion.
9. Poor peripheral perfusion may make which monitoring device less reliable?
A. Foley catheter
B. Electrocardiogram
C. Pulse oximeter
D. Core temperature probe
Answer: C. Pulse oximeter
Rationale: Severe vasoconstriction and poor peripheral blood flow can reduce
the accuracy or availability of pulse oximetry readings.
10.Which parameter is calculated by subtracting diastolic blood pressure from
systolic blood pressure?
A. Mean arterial pressure
B. Shock index
C. Central venous pressure
D. Pulse pressure
Answer: D. Pulse pressure
Rationale: Pulse pressure equals systolic blood pressure minus diastolic blood
pressure. A narrowing pulse pressure may occur with reduced stroke volume and
worsening shock.
11.Shock index is calculated as:
