American Red Cross ACLS Acute
Coronary Syndrome Examination
Questions And Correct Answers
(Verified Answers) Plus Rationales
2026 Q&A | Instant Download Pdf
1.
A patient develops sudden substernal chest pressure while walking. The
discomfort is described as squeezing and radiates to the left arm. Which
finding most strongly suggests acute coronary syndrome (ACS)?
A. Pain that improves consistently with movement
B. Sharp pain occurring only with deep inspiration
C. Pressure-like chest discomfort with radiation and associated
diaphoresis
D. Brief discomfort lasting one second
**Answer: C. Pressure-like chest discomfort with radiation and
associated diaphoresis
Rationale: Pressure, squeezing, heaviness, or tightness in the chest
accompanied by symptoms such as diaphoresis, nausea, dyspnea, or
radiation to the arm or jaw is characteristic of myocardial ischemia.
ACS can present atypically, but persistent pressure-like discomfort
with autonomic symptoms should prompt rapid assessment, ECG
acquisition, and appropriate emergency management.
2.
,What is the most important initial diagnostic test for a patient with
suspected ACS?
A. 12-lead ECG
B. Chest radiograph
C. Echocardiogram
D. Exercise stress test
**Answer: A. 12-lead ECG
Rationale: A 12-lead ECG is a critical early test in suspected ACS
because it can identify ST-segment elevation and other ischemic
changes that may require immediate reperfusion therapy. It should be
obtained promptly rather than delaying evaluation for less urgent
diagnostic studies.
3.
A patient with suspected ACS has an oxygen saturation of 98% on room
air and no respiratory distress. Which approach is most appropriate?
A. Administer high-flow oxygen routinely
B. Administer oxygen regardless of saturation
C. Delay ECG acquisition until oxygen is started
D. Do not routinely administer supplemental oxygen when
oxygenation is adequate
**Answer: D. Do not routinely administer supplemental oxygen when
oxygenation is adequate
Rationale: Routine oxygen administration is not indicated for every
patient with suspected ACS. Supplemental oxygen is generally reserved
for patients with hypoxemia, respiratory distress, or another clear
indication. Unnecessary oxygen can expose patients to potential harm
,without providing demonstrated benefit when oxygenation is already
adequate.
4.
Which symptom may represent an atypical presentation of ACS,
particularly in older adults?
A. Unexplained shortness of breath
B. Itchy skin only
C. Isolated ankle swelling after exercise
D. Chronic nasal congestion
**Answer: A. Unexplained shortness of breath
Rationale: ACS does not always present with classic chest pain.
Dyspnea, nausea, vomiting, unusual fatigue, syncope, weakness, or
epigastric discomfort may occur, particularly in older adults and
patients with diabetes. Atypical symptoms should not be dismissed
when the clinical context suggests possible myocardial ischemia.
5.
Which biomarker is most commonly used to identify myocardial injury
in suspected ACS?
A. D-dimer
B. BNP
C. Cardiac troponin
D. Serum amylase
**Answer: C. Cardiac troponin
Rationale: Cardiac troponins are highly sensitive and specific
biomarkers of myocardial injury. Serial measurements may be
necessary because an initially normal value does not always exclude
, an evolving myocardial infarction. Troponin results must be
interpreted alongside symptoms, ECG findings, and the overall clinical
picture.
6.
A patient with suspected myocardial infarction is being evaluated.
Which medication is generally administered early when there is no
contraindication?
A. Warfarin
B. Aspirin
C. Digoxin
D. Furosemide
**Answer: B. Aspirin
Rationale: Aspirin inhibits platelet aggregation and is a foundational
early treatment for suspected ACS when there is no significant allergy,
active bleeding, or other contraindication. Early administration can
reduce adverse cardiovascular outcomes. The patient should receive
the appropriate chewable dose according to the applicable protocol.
7.
Why is aspirin useful during an acute coronary syndrome?
A. It directly dissolves the coronary clot
B. It lowers blood glucose
C. It increases myocardial oxygen demand
D. It inhibits platelet aggregation
**Answer: D. It inhibits platelet aggregation
Rationale: Platelet activation and aggregation contribute substantially
to coronary thrombus formation during ACS. Aspirin irreversibly
Coronary Syndrome Examination
Questions And Correct Answers
(Verified Answers) Plus Rationales
2026 Q&A | Instant Download Pdf
1.
A patient develops sudden substernal chest pressure while walking. The
discomfort is described as squeezing and radiates to the left arm. Which
finding most strongly suggests acute coronary syndrome (ACS)?
A. Pain that improves consistently with movement
B. Sharp pain occurring only with deep inspiration
C. Pressure-like chest discomfort with radiation and associated
diaphoresis
D. Brief discomfort lasting one second
**Answer: C. Pressure-like chest discomfort with radiation and
associated diaphoresis
Rationale: Pressure, squeezing, heaviness, or tightness in the chest
accompanied by symptoms such as diaphoresis, nausea, dyspnea, or
radiation to the arm or jaw is characteristic of myocardial ischemia.
ACS can present atypically, but persistent pressure-like discomfort
with autonomic symptoms should prompt rapid assessment, ECG
acquisition, and appropriate emergency management.
2.
,What is the most important initial diagnostic test for a patient with
suspected ACS?
A. 12-lead ECG
B. Chest radiograph
C. Echocardiogram
D. Exercise stress test
**Answer: A. 12-lead ECG
Rationale: A 12-lead ECG is a critical early test in suspected ACS
because it can identify ST-segment elevation and other ischemic
changes that may require immediate reperfusion therapy. It should be
obtained promptly rather than delaying evaluation for less urgent
diagnostic studies.
3.
A patient with suspected ACS has an oxygen saturation of 98% on room
air and no respiratory distress. Which approach is most appropriate?
A. Administer high-flow oxygen routinely
B. Administer oxygen regardless of saturation
C. Delay ECG acquisition until oxygen is started
D. Do not routinely administer supplemental oxygen when
oxygenation is adequate
**Answer: D. Do not routinely administer supplemental oxygen when
oxygenation is adequate
Rationale: Routine oxygen administration is not indicated for every
patient with suspected ACS. Supplemental oxygen is generally reserved
for patients with hypoxemia, respiratory distress, or another clear
indication. Unnecessary oxygen can expose patients to potential harm
,without providing demonstrated benefit when oxygenation is already
adequate.
4.
Which symptom may represent an atypical presentation of ACS,
particularly in older adults?
A. Unexplained shortness of breath
B. Itchy skin only
C. Isolated ankle swelling after exercise
D. Chronic nasal congestion
**Answer: A. Unexplained shortness of breath
Rationale: ACS does not always present with classic chest pain.
Dyspnea, nausea, vomiting, unusual fatigue, syncope, weakness, or
epigastric discomfort may occur, particularly in older adults and
patients with diabetes. Atypical symptoms should not be dismissed
when the clinical context suggests possible myocardial ischemia.
5.
Which biomarker is most commonly used to identify myocardial injury
in suspected ACS?
A. D-dimer
B. BNP
C. Cardiac troponin
D. Serum amylase
**Answer: C. Cardiac troponin
Rationale: Cardiac troponins are highly sensitive and specific
biomarkers of myocardial injury. Serial measurements may be
necessary because an initially normal value does not always exclude
, an evolving myocardial infarction. Troponin results must be
interpreted alongside symptoms, ECG findings, and the overall clinical
picture.
6.
A patient with suspected myocardial infarction is being evaluated.
Which medication is generally administered early when there is no
contraindication?
A. Warfarin
B. Aspirin
C. Digoxin
D. Furosemide
**Answer: B. Aspirin
Rationale: Aspirin inhibits platelet aggregation and is a foundational
early treatment for suspected ACS when there is no significant allergy,
active bleeding, or other contraindication. Early administration can
reduce adverse cardiovascular outcomes. The patient should receive
the appropriate chewable dose according to the applicable protocol.
7.
Why is aspirin useful during an acute coronary syndrome?
A. It directly dissolves the coronary clot
B. It lowers blood glucose
C. It increases myocardial oxygen demand
D. It inhibits platelet aggregation
**Answer: D. It inhibits platelet aggregation
Rationale: Platelet activation and aggregation contribute substantially
to coronary thrombus formation during ACS. Aspirin irreversibly
