ALS/ACLS - Red Cross Final Exam
[2025] Top-Rated Exam fully
solved & updated (latest version
verified for accuracy) | Latest!!
1. The resuscitation team suspects that hyperkalemia is the
cause of cardiac arrest in a patient brought to the
emergency department. Which finding on a 12-lead ECG
would confirm this suspicion?
Correct Answer: Wide-complex ventricular rhythm or tall,
pointed T waves
Rationale:
Hyperkalemia alters cardiac membrane excitability and
conduction. Early ECG manifestations commonly include tall,
narrow, peaked T waves, while progressive hyperkalemia
can cause PR prolongation, loss of P waves, QRS widening,
and eventually a sine-wave pattern or ventricular dysrhythmia.
A wide-complex ventricular rhythm in the setting of suspected
hyperkalemia is therefore a serious manifestation of potassium
toxicity and requires immediate treatment.
,2. A patient with dyspnea and a change in mental status
arrives at the emergency department. The healthcare team
completes the necessary assessments and begins to care for
the patient, including initiating cardiac monitoring, pulse
oximetry, supplemental oxygen, and vascular access. The
team reviews the patient's ECG rhythm strip, as shown in
the following figure. Which agent would the team most
likely administer?
Correct Answer: Atropine 0.5 mg every 4 to 5 minutes
Rationale:
Atropine is used as a first-line medication for symptomatic
bradycardia when the patient has signs of poor perfusion, such
as altered mental status, hypotension, ischemic chest
discomfort, or acute heart failure. It works by blocking
parasympathetic effects on the heart, thereby increasing the
sinus rate and improving AV-node conduction. If atropine is
ineffective, pacing or vasoactive infusions may be required.
3. A patient experiencing an unstable bradyarrhythmia
does not respond to atropine or transcutaneous pacing.
Which intervention would the healthcare provider use
next?
,Correct Answer: Administration of an epinephrine infusion
Rationale:
When symptomatic or unstable bradycardia persists despite
atropine and pacing is unsuccessful or ineffective, an
epinephrine infusion is an appropriate next intervention.
Epinephrine provides both chronotropic and vasopressor
effects, increasing heart rate, contractility, and vascular tone to
improve cardiac output and perfusion.
4. A patient's ECG reveals a tachyarrhythmia. The patient
is hemodynamically stable and has a heart rate ranging
from 120 to 135 beats per minute. Based on the findings of
the secondary assessment, which statement(s) by the
patient would the team interpret as a possible contributing
cause?
Correct Answers:
1. "I've had a terrible cold with a horrible cough and fever
the past week."
2. "I've been so anxious lately because I just lost my job."
3. "I've been vomiting for the past 2 days from a
gastrointestinal bug."
, Rationale:
Several reversible conditions can produce or worsen
tachycardia. Fever and infection increase metabolic demand
and sympathetic activity. Anxiety and emotional stress
stimulate the sympathetic nervous system and can increase
heart rate. Vomiting can cause dehydration and electrolyte
disturbances, both of which may contribute to
tachyarrhythmias. Identifying and treating the underlying
cause is an essential part of managing a stable
tachyarrhythmia.
5. A patient's ECG reveals a narrow QRS complex with a
regular rhythm, indicating a narrow-complex
supraventricular tachyarrhythmia. The patient is
hemodynamically stable. Which intervention would be
initiated first?
Correct Answer: Vagal maneuvers
Rationale:
For a hemodynamically stable patient with a regular narrow-
complex supraventricular tachyarrhythmia, vagal maneuvers
are the initial intervention. They increase vagal activity and
can transiently slow AV-node conduction, potentially
[2025] Top-Rated Exam fully
solved & updated (latest version
verified for accuracy) | Latest!!
1. The resuscitation team suspects that hyperkalemia is the
cause of cardiac arrest in a patient brought to the
emergency department. Which finding on a 12-lead ECG
would confirm this suspicion?
Correct Answer: Wide-complex ventricular rhythm or tall,
pointed T waves
Rationale:
Hyperkalemia alters cardiac membrane excitability and
conduction. Early ECG manifestations commonly include tall,
narrow, peaked T waves, while progressive hyperkalemia
can cause PR prolongation, loss of P waves, QRS widening,
and eventually a sine-wave pattern or ventricular dysrhythmia.
A wide-complex ventricular rhythm in the setting of suspected
hyperkalemia is therefore a serious manifestation of potassium
toxicity and requires immediate treatment.
,2. A patient with dyspnea and a change in mental status
arrives at the emergency department. The healthcare team
completes the necessary assessments and begins to care for
the patient, including initiating cardiac monitoring, pulse
oximetry, supplemental oxygen, and vascular access. The
team reviews the patient's ECG rhythm strip, as shown in
the following figure. Which agent would the team most
likely administer?
Correct Answer: Atropine 0.5 mg every 4 to 5 minutes
Rationale:
Atropine is used as a first-line medication for symptomatic
bradycardia when the patient has signs of poor perfusion, such
as altered mental status, hypotension, ischemic chest
discomfort, or acute heart failure. It works by blocking
parasympathetic effects on the heart, thereby increasing the
sinus rate and improving AV-node conduction. If atropine is
ineffective, pacing or vasoactive infusions may be required.
3. A patient experiencing an unstable bradyarrhythmia
does not respond to atropine or transcutaneous pacing.
Which intervention would the healthcare provider use
next?
,Correct Answer: Administration of an epinephrine infusion
Rationale:
When symptomatic or unstable bradycardia persists despite
atropine and pacing is unsuccessful or ineffective, an
epinephrine infusion is an appropriate next intervention.
Epinephrine provides both chronotropic and vasopressor
effects, increasing heart rate, contractility, and vascular tone to
improve cardiac output and perfusion.
4. A patient's ECG reveals a tachyarrhythmia. The patient
is hemodynamically stable and has a heart rate ranging
from 120 to 135 beats per minute. Based on the findings of
the secondary assessment, which statement(s) by the
patient would the team interpret as a possible contributing
cause?
Correct Answers:
1. "I've had a terrible cold with a horrible cough and fever
the past week."
2. "I've been so anxious lately because I just lost my job."
3. "I've been vomiting for the past 2 days from a
gastrointestinal bug."
, Rationale:
Several reversible conditions can produce or worsen
tachycardia. Fever and infection increase metabolic demand
and sympathetic activity. Anxiety and emotional stress
stimulate the sympathetic nervous system and can increase
heart rate. Vomiting can cause dehydration and electrolyte
disturbances, both of which may contribute to
tachyarrhythmias. Identifying and treating the underlying
cause is an essential part of managing a stable
tachyarrhythmia.
5. A patient's ECG reveals a narrow QRS complex with a
regular rhythm, indicating a narrow-complex
supraventricular tachyarrhythmia. The patient is
hemodynamically stable. Which intervention would be
initiated first?
Correct Answer: Vagal maneuvers
Rationale:
For a hemodynamically stable patient with a regular narrow-
complex supraventricular tachyarrhythmia, vagal maneuvers
are the initial intervention. They increase vagal activity and
can transiently slow AV-node conduction, potentially
