Advanced Cardiovascular Life Support (ACLS) Certification
Exam Version 1– Emergency Cardiac Care and
Resuscitation Updated and Latest Questions and Correct
Answers with Rationale
1. What is the recommended compression-to-ventilation ratio for a single rescuer
performing adult CPR?
A. 30:2
B. 15:2
C. 20:1
D. 10:1
Ans: A
Rationale: The correct ratio for adult cardiopulmonary resuscitation is 30 compressions to 2 breaths to
maximize blood flow. This standard is established by the American Heart Association to ensure adequate
coronary and cerebral perfusion during the early stages of cardiac arrest. High-quality chest
compressions are the foundation of basic life support and directly impact the success of later advanced
interventions. By maintaining this ratio, rescuers provide a balance between circulatory support and
oxygenation before an advanced airway is placed. Deviating from this ratio can lead to decreased cardiac
output or insufficient ventilation during the resuscitation attempt. Frequent interruptions in
compressions must be avoided to keep the coronary perfusion pressure high enough to achieve ROSC.
Therefore, the 30:2 ratio remains the gold standard for adult victims regardless of the number of
rescuers in basic life support.
,2. What is the ideal depth for chest compressions on an adult victim during ACLS?
A. About 1 inch (2.5 cm)
B. Exactly 1.5 inches (4 cm)
C. At least 3 inches (8 cm)
D. At least 2 inches (5 cm) but not more than 2.4 inches (6 cm)
Ans: D
Rationale: Effective chest compressions must reach a depth of at least 2 inches to adequately squeeze
the heart against the spine. However, research suggests that compressions exceeding 2.4 inches may
cause unnecessary physical injury to the patient’s internal organs. Maintaining this specific range ensures
that the thoracic pump mechanism is optimized for moving oxygenated blood to the brain. Proper depth
is critical because shallow compressions do not generate enough pressure to circulate blood through the
coronary arteries. Rescuers often underestimate their compression depth, which is why real-time
feedback devices are highly recommended in clinical settings. Consistency in depth across cycles
prevents fatigue from reducing the effectiveness of the resuscitation efforts. Following these precise
guidelines increases the likelihood of a successful defibrillation by preparing the myocardium for shock
delivery.
,3. What is the recommended rate of chest compressions for an adult in cardiac arrest?
A. 80 to 100 per minute
B. 60 to 80 per minute
C. 120 to 140 per minute
D. 100 to 120 per minute
Ans: D
Rationale: The target rate for chest compressions is 100 to 120 per minute to provide sufficient cardiac
output while allowing for full chest recoil. Compressing too slowly fails to build up the necessary
pressure to perfuse the brain and heart during the arrest. Conversely, compressing faster than 120 beats
per minute reduces the time for the ventricles to fill and decreases overall stroke volume. Maintaining a
steady rhythm within this range is a core component of high-quality CPR and improved patient outcomes.
Studies have shown that staying within this specific window maximizes the chance of achieving a Return
of Spontaneous Circulation (ROSC). Rescuers are encouraged to use metronomes or music with the
appropriate tempo to stay on track during high-stress scenarios. Consistent rate monitoring is essential
because manual compression quality often degrades over time without the rescuer noticing.
, 4. In the ACLS pulseless arrest algorithm, which drug is typically administered first after the
second shock?
A. Atropine
B. Amiodarone
C. Epinephrine
D. Magnesium Sulfate
Ans: C
Rationale: Epinephrine is the primary vasopressor used during cardiac arrest because it increases
coronary and cerebral blood flow. It is typically administered every 3 to 5 minutes after the first or
second shock depending on the specific cardiac rhythm. The alpha-adrenergic effects of Epinephrine
cause peripheral vasoconstriction, which shunts blood to the vital organs during CPR. While Epinephrine
does not improve long-term survival with good neurological outcomes in all studies, it significantly
increases the rate of ROSC. It is used in both shockable rhythms like VF/pVT and non-shockable rhythms
like PEA/Asystole. Proper timing is essential; in non-shockable rhythms, it should be given as soon as
possible after access is established. In shockable rhythms, it is given after initial shocks have failed to
convert the heart back into a perfusing rhythm.
Exam Version 1– Emergency Cardiac Care and
Resuscitation Updated and Latest Questions and Correct
Answers with Rationale
1. What is the recommended compression-to-ventilation ratio for a single rescuer
performing adult CPR?
A. 30:2
B. 15:2
C. 20:1
D. 10:1
Ans: A
Rationale: The correct ratio for adult cardiopulmonary resuscitation is 30 compressions to 2 breaths to
maximize blood flow. This standard is established by the American Heart Association to ensure adequate
coronary and cerebral perfusion during the early stages of cardiac arrest. High-quality chest
compressions are the foundation of basic life support and directly impact the success of later advanced
interventions. By maintaining this ratio, rescuers provide a balance between circulatory support and
oxygenation before an advanced airway is placed. Deviating from this ratio can lead to decreased cardiac
output or insufficient ventilation during the resuscitation attempt. Frequent interruptions in
compressions must be avoided to keep the coronary perfusion pressure high enough to achieve ROSC.
Therefore, the 30:2 ratio remains the gold standard for adult victims regardless of the number of
rescuers in basic life support.
,2. What is the ideal depth for chest compressions on an adult victim during ACLS?
A. About 1 inch (2.5 cm)
B. Exactly 1.5 inches (4 cm)
C. At least 3 inches (8 cm)
D. At least 2 inches (5 cm) but not more than 2.4 inches (6 cm)
Ans: D
Rationale: Effective chest compressions must reach a depth of at least 2 inches to adequately squeeze
the heart against the spine. However, research suggests that compressions exceeding 2.4 inches may
cause unnecessary physical injury to the patient’s internal organs. Maintaining this specific range ensures
that the thoracic pump mechanism is optimized for moving oxygenated blood to the brain. Proper depth
is critical because shallow compressions do not generate enough pressure to circulate blood through the
coronary arteries. Rescuers often underestimate their compression depth, which is why real-time
feedback devices are highly recommended in clinical settings. Consistency in depth across cycles
prevents fatigue from reducing the effectiveness of the resuscitation efforts. Following these precise
guidelines increases the likelihood of a successful defibrillation by preparing the myocardium for shock
delivery.
,3. What is the recommended rate of chest compressions for an adult in cardiac arrest?
A. 80 to 100 per minute
B. 60 to 80 per minute
C. 120 to 140 per minute
D. 100 to 120 per minute
Ans: D
Rationale: The target rate for chest compressions is 100 to 120 per minute to provide sufficient cardiac
output while allowing for full chest recoil. Compressing too slowly fails to build up the necessary
pressure to perfuse the brain and heart during the arrest. Conversely, compressing faster than 120 beats
per minute reduces the time for the ventricles to fill and decreases overall stroke volume. Maintaining a
steady rhythm within this range is a core component of high-quality CPR and improved patient outcomes.
Studies have shown that staying within this specific window maximizes the chance of achieving a Return
of Spontaneous Circulation (ROSC). Rescuers are encouraged to use metronomes or music with the
appropriate tempo to stay on track during high-stress scenarios. Consistent rate monitoring is essential
because manual compression quality often degrades over time without the rescuer noticing.
, 4. In the ACLS pulseless arrest algorithm, which drug is typically administered first after the
second shock?
A. Atropine
B. Amiodarone
C. Epinephrine
D. Magnesium Sulfate
Ans: C
Rationale: Epinephrine is the primary vasopressor used during cardiac arrest because it increases
coronary and cerebral blood flow. It is typically administered every 3 to 5 minutes after the first or
second shock depending on the specific cardiac rhythm. The alpha-adrenergic effects of Epinephrine
cause peripheral vasoconstriction, which shunts blood to the vital organs during CPR. While Epinephrine
does not improve long-term survival with good neurological outcomes in all studies, it significantly
increases the rate of ROSC. It is used in both shockable rhythms like VF/pVT and non-shockable rhythms
like PEA/Asystole. Proper timing is essential; in non-shockable rhythms, it should be given as soon as
possible after access is established. In shockable rhythms, it is given after initial shocks have failed to
convert the heart back into a perfusing rhythm.
