American Red Cross ACLS
Bradycardia and Tachycardia
Examination Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
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1. A patient has a heart rate of 42/min with hypotension, altered
mental status, and cool, clammy skin. Which finding most strongly
indicates that the bradycardia is clinically significant?
A. The heart rate is below 50/min
B. The patient reports mild fatigue
C. The bradycardia is associated with signs of poor perfusion
D. The rhythm is regular
Answer: C. The bradycardia is associated with signs of poor
perfusion
Rationale: Symptomatic or clinically significant bradycardia is
identified by evidence that the slow heart rate is causing hemodynamic
compromise. Hypotension, altered mental status, shock, ischemic chest
discomfort, and acute heart failure are important manifestations of
poor perfusion. A low heart rate alone does not necessarily require
treatment.
2. A patient with symptomatic bradycardia has an adequate airway
and is receiving supplemental oxygen as indicated. What should
the clinician do next?
,A. Administer adenosine
B. Attach a cardiac monitor and assess the rhythm
C. Give a rapid fluid bolus to every patient
D. Perform synchronized cardioversion
Answer: B. Attach a cardiac monitor and assess the rhythm
Rationale: Continuous cardiac monitoring allows identification of the
rhythm and its relationship to the patient's symptoms. Assessment
should occur while immediate supportive measures are provided. The
rhythm may represent sinus bradycardia, a conduction disorder, or
another rhythm requiring a different intervention.
3. Which medication is commonly used as an initial pharmacologic
treatment for symptomatic bradycardia in adults when appropriate?
A. Amiodarone
B. Adenosine
C. Lidocaine
D. Atropine
Answer: D. Atropine
Rationale: Atropine is an anticholinergic medication that increases
sinus node activity and can improve atrioventricular conduction. It is
commonly used for symptomatic bradycardia, particularly when the
problem is related to excessive vagal influence or conduction through
the AV node.
4. A patient receiving atropine for symptomatic bradycardia does not
improve. Which intervention should be considered when the
patient remains unstable?
A. Transcutaneous pacing
B. Observation without intervention
,C. Oral beta-blocker therapy
D. Vagal maneuvers
Answer: A. Transcutaneous pacing
Rationale: Persistent symptomatic bradycardia with hemodynamic
instability may require pacing. Transcutaneous pacing can provide an
immediate electrical stimulus to produce ventricular contractions
while definitive management, such as transvenous pacing or treatment
of the underlying cause, is arranged.
5. Which assessment is particularly important when evaluating a
patient with a slow heart rate?
A. Hair color
B. Recent dietary preferences
C. Blood pressure and signs of inadequate perfusion
D. Family history of hypertension only
Answer: C. Blood pressure and signs of inadequate perfusion
Rationale: The clinical significance of bradycardia depends heavily on
whether cardiac output is compromised. Blood pressure, mental status,
skin perfusion, respiratory status, and symptoms such as chest
discomfort or acute heart failure help determine whether immediate
treatment is necessary.
6. A patient with bradycardia is awake, alert, normotensive, and
without chest discomfort or heart failure. What is generally
appropriate?
A. Immediate defibrillation
B. Immediate synchronized cardioversion
C. Immediate transvenous pacing in every case
D. Continue assessment and identify the underlying cause
, Answer: D. Continue assessment and identify the underlying cause
Rationale: Asymptomatic bradycardia without evidence of poor
perfusion may not require emergency treatment. The clinician should
evaluate possible causes such as medications, hypoxia, electrolyte
abnormalities, ischemia, hypothermia, or conduction disease while
continuing to monitor the patient.
7. Which medication class can produce clinically important
bradycardia?
A. Beta-adrenergic blockers
B. Antacids
C. Osmotic laxatives
D. Topical moisturizers
Answer: A. Beta-adrenergic blockers
Rationale: Beta-blockers can slow the sinus rate and reduce AV nodal
conduction. Excessive dosing or increased sensitivity may contribute to
significant bradycardia and hypotension. Medication history is
therefore an important part of evaluating an unstable slow rhythm.
8. A patient has symptomatic bradycardia caused by an acute inferior
myocardial infarction. Why is close monitoring particularly
important?
A. Inferior infarction can never affect conduction
B. Ischemia can involve conduction tissue and produce AV block
C. Inferior infarction always causes ventricular fibrillation
D. Bradycardia proves that the infarction is resolving
Answer: B. Ischemia can involve conduction tissue and produce AV
block
Bradycardia and Tachycardia
Examination Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. A patient has a heart rate of 42/min with hypotension, altered
mental status, and cool, clammy skin. Which finding most strongly
indicates that the bradycardia is clinically significant?
A. The heart rate is below 50/min
B. The patient reports mild fatigue
C. The bradycardia is associated with signs of poor perfusion
D. The rhythm is regular
Answer: C. The bradycardia is associated with signs of poor
perfusion
Rationale: Symptomatic or clinically significant bradycardia is
identified by evidence that the slow heart rate is causing hemodynamic
compromise. Hypotension, altered mental status, shock, ischemic chest
discomfort, and acute heart failure are important manifestations of
poor perfusion. A low heart rate alone does not necessarily require
treatment.
2. A patient with symptomatic bradycardia has an adequate airway
and is receiving supplemental oxygen as indicated. What should
the clinician do next?
,A. Administer adenosine
B. Attach a cardiac monitor and assess the rhythm
C. Give a rapid fluid bolus to every patient
D. Perform synchronized cardioversion
Answer: B. Attach a cardiac monitor and assess the rhythm
Rationale: Continuous cardiac monitoring allows identification of the
rhythm and its relationship to the patient's symptoms. Assessment
should occur while immediate supportive measures are provided. The
rhythm may represent sinus bradycardia, a conduction disorder, or
another rhythm requiring a different intervention.
3. Which medication is commonly used as an initial pharmacologic
treatment for symptomatic bradycardia in adults when appropriate?
A. Amiodarone
B. Adenosine
C. Lidocaine
D. Atropine
Answer: D. Atropine
Rationale: Atropine is an anticholinergic medication that increases
sinus node activity and can improve atrioventricular conduction. It is
commonly used for symptomatic bradycardia, particularly when the
problem is related to excessive vagal influence or conduction through
the AV node.
4. A patient receiving atropine for symptomatic bradycardia does not
improve. Which intervention should be considered when the
patient remains unstable?
A. Transcutaneous pacing
B. Observation without intervention
,C. Oral beta-blocker therapy
D. Vagal maneuvers
Answer: A. Transcutaneous pacing
Rationale: Persistent symptomatic bradycardia with hemodynamic
instability may require pacing. Transcutaneous pacing can provide an
immediate electrical stimulus to produce ventricular contractions
while definitive management, such as transvenous pacing or treatment
of the underlying cause, is arranged.
5. Which assessment is particularly important when evaluating a
patient with a slow heart rate?
A. Hair color
B. Recent dietary preferences
C. Blood pressure and signs of inadequate perfusion
D. Family history of hypertension only
Answer: C. Blood pressure and signs of inadequate perfusion
Rationale: The clinical significance of bradycardia depends heavily on
whether cardiac output is compromised. Blood pressure, mental status,
skin perfusion, respiratory status, and symptoms such as chest
discomfort or acute heart failure help determine whether immediate
treatment is necessary.
6. A patient with bradycardia is awake, alert, normotensive, and
without chest discomfort or heart failure. What is generally
appropriate?
A. Immediate defibrillation
B. Immediate synchronized cardioversion
C. Immediate transvenous pacing in every case
D. Continue assessment and identify the underlying cause
, Answer: D. Continue assessment and identify the underlying cause
Rationale: Asymptomatic bradycardia without evidence of poor
perfusion may not require emergency treatment. The clinician should
evaluate possible causes such as medications, hypoxia, electrolyte
abnormalities, ischemia, hypothermia, or conduction disease while
continuing to monitor the patient.
7. Which medication class can produce clinically important
bradycardia?
A. Beta-adrenergic blockers
B. Antacids
C. Osmotic laxatives
D. Topical moisturizers
Answer: A. Beta-adrenergic blockers
Rationale: Beta-blockers can slow the sinus rate and reduce AV nodal
conduction. Excessive dosing or increased sensitivity may contribute to
significant bradycardia and hypotension. Medication history is
therefore an important part of evaluating an unstable slow rhythm.
8. A patient has symptomatic bradycardia caused by an acute inferior
myocardial infarction. Why is close monitoring particularly
important?
A. Inferior infarction can never affect conduction
B. Ischemia can involve conduction tissue and produce AV block
C. Inferior infarction always causes ventricular fibrillation
D. Bradycardia proves that the infarction is resolving
Answer: B. Ischemia can involve conduction tissue and produce AV
block
