Relias Advanced Dysrhythmia
Exam A: The Elite Test Bank
(2026/2027 Standards)
PART I: THE PRIMER
Mastery of clinical electrophysiology separates the elite practitioner from the liability. In 2026,
relying solely on artificial intelligence for rhythm interpretation is professional suicide; you must
own the diagnostic intuition to intervene decisively and save the patient.
The "Panic Button" Cheat Sheet:
● Hemodynamic Instability: Mandates immediate synchronized cardioversion or
unsynchronized defibrillation.
● Wide & Fast (QRS >0.12s, Rate >100): Presume Ventricular Tachycardia (VT) until
proven otherwise. Administration of calcium channel blockers here is lethal.
● Pacemaker Spike + No QRS: Failure to Capture.
● Pacemaker Spike inside QRS/T: Failure to Sense (Undersensing).
● AHA 2025 Cardioversion Update: Minimum 200J initial biphasic shock for Atrial
Fibrillation/Flutter.
● AHA 2025 Access Update: Intravenous (IV) access is strictly preferred over
Intraosseous (IO) for cardiac arrest.
PART II: THE ELITE TEST BANK
Q1: A patient’s electrocardiogram reveals a regular rhythm with a rate of 72 bpm. The PR
interval measures 0.16 seconds, and the QRS complex measures 0.08 seconds. What is
the precise clinical interpretation? A) First-Degree AV Block B) Normal Sinus Rhythm C)
Accelerated Junctional Rhythm D) Sinus Rhythm with Bundle Branch Block
● The Answer: B. Normal Sinus Rhythm.
● Distractor Analysis: Option A requires a PR interval exceeding 0.20 seconds. Option C
lacks an upright P wave or features an inverted P wave. Option D requires a QRS
complex duration greater than 0.12 seconds.
● The Mentor's Analysis: This is the foundational baseline. Normal PR interval spans
0.12-0.20 seconds; normal QRS is less than 0.12 seconds. You cannot identify pathology
until you establish the rigid mathematical boundaries of normal cellular depolarization and
electrophysiology.
Q2: A 6-second rhythm strip demonstrates an irregularly irregular rhythm, no discernible
P waves, and a fibrillatory baseline. The QRS duration is 0.08 seconds, and there are 12
QRS complexes in the strip. What is the correct interpretation? A) Atrial Flutter with
variable block B) Ventricular Fibrillation C) Atrial Fibrillation with Rapid Ventricular Response
(RVR) D) Wandering Atrial Pacemaker
● The Answer: C. Atrial Fibrillation with Rapid Ventricular Response (RVR).
, ● Distractor Analysis: Option A requires distinct sawtooth flutter waves. Option B is a
lethal, wide-complex pulseless arrest rhythm. Option D requires at least three distinct
P-wave morphologies, which are absent here.
● The Mentor's Analysis: Twelve complexes in 6 seconds equals a rate of 120 bpm. An
irregularly irregular rhythm with an absent atrial kick defines Atrial Fibrillation. A
ventricular rate exceeding 100 bpm classifies it strictly as RVR, requiring immediate
assessment of hemodynamic stability.
Q3: A rhythm strip demonstrates regular P waves at a rate of 300 bpm with a
characteristic sawtooth pattern. The QRS complexes occur regularly at a rate of 75 bpm.
What is the precise conduction ratio? A) 2:1 B) 3:1 C) 4:1 D) Variable
● The Answer: C. 4:1.
● Distractor Analysis: The atrial rate is 300; the ventricular rate is 75. A 2:1 block would
yield a ventricular rate of 150 bpm. Variable block produces an irregular ventricular
rhythm, which contradicts the stem.
● The Mentor's Analysis: Three hundred divided by 75 equals 4. The atrioventricular (AV)
node is protecting the ventricles by blocking three out of every four atrial impulses. This
reflects a stable, fixed macro-reentrant circuit typical of typical Atrial Flutter.
Q4: A regular rhythm is observed at a rate of 45 bpm. P waves are entirely absent from
the tracing. The QRS complex measures 0.10 seconds. What is the defining rhythm? A)
Sinus Bradycardia B) Junctional Escape Rhythm C) Idioventricular Rhythm D) Second-Degree
AV Block Type II
● The Answer: B. Junctional Escape Rhythm.
● Distractor Analysis: Option A explicitly requires an upright P wave in lead II. Option C
features a wide QRS (>0.12s) due to its ventricular origin. Option D features P waves that
fail to conduct.
● The Mentor's Analysis: The AV junction has assumed pacing control due to SA node
failure. The intrinsic pacing rate of the AV node is 40-60 bpm, producing a narrow QRS
because conduction down the bundle of His remains completely intact.
Q5: A patient’s rhythm is regular at 85 bpm. A premature, narrow QRS complex occurs,
preceded by an abnormally shaped P wave that is partially hidden in the preceding T
wave. What is this ectopic beat? A) Premature Ventricular Contraction (PVC) B) Premature
Junctional Contraction (PJC) C) Premature Atrial Contraction (PAC) D) Aberrant Ventricular
Beat
● The Answer: C. Premature Atrial Contraction (PAC).
● Distractor Analysis: PVCs are wide and lack preceding P waves. PJCs lack an upright P
wave (often inverted or absent). Aberrancy strictly involves a wide QRS complex.
● The Mentor's Analysis: An ectopic atrial focus fired before the SA node's scheduled
depolarization. The key identifier is the abnormal P wave morphology, proving the impulse
originated in the atria but outside the sinus node.
Q6: An ECG shows a regular rhythm at 70 bpm. Every P wave is followed by a QRS
complex, but the PR interval is constant at 0.28 seconds. What is the correct rhythm
classification? A) Normal Sinus Rhythm B) First-Degree AV Block C) Second-Degree AV Block
Type I D) Second-Degree AV Block Type II
● The Answer: B. First-Degree AV Block.
● Distractor Analysis: NSR dictates a PR interval <0.20s. Type I features a progressively
lengthening PR interval. Type II drops QRS complexes entirely.
● The Mentor's Analysis: First-degree block is not a true "block" but a consistent
conduction delay at the AV node. Every impulse eventually conducts to the ventricles, but
, the conduction velocity is impaired, pushing the interval beyond the 0.20-second
threshold.
Q7: A rhythm strip shows a progressive lengthening of the PR interval until a P wave
appears without a subsequent QRS complex. The sequence then resets. What is the
clinical name for this phenomenon? A) Mobitz Type II B) Complete Heart Block C)
Wenckebach (Mobitz Type I) D) Non-conducted PAC
● The Answer: C. Wenckebach (Mobitz Type I).
● Distractor Analysis: Mobitz II drops beats without any progressive PR lengthening.
Complete block features total AV dissociation. A non-conducted PAC is an isolated
ectopic event, not a predictable cyclical pattern.
● The Mentor's Analysis: The AV node progressively fatigues with each beat until it
completely blocks an impulse, then recovers during the pause. The professional heuristic
is "long, longer, longest, drop". It is typically a benign nodal phenomenon.
Q8: A patient is in a regular sinus rhythm at 80 bpm. Suddenly, a wide, bizarre QRS
complex measuring 0.16 seconds appears without a preceding P wave. A fully
compensatory pause follows. This describes a: A) Premature Atrial Contraction with
aberrancy B) Premature Ventricular Contraction (PVC) C) Junctional Escape Beat D) Ashman
Phenomenon
● The Answer: B. Premature Ventricular Contraction (PVC).
● Distractor Analysis: PACs have identifiable P waves. Junctional beats are typically
narrow. Ashman phenomenon occurs specifically in irregular rhythms (like AFib) with
long-short cycle lengths.
● The Mentor's Analysis: An irritable ventricular focus fired independently. The wide QRS
reflects slow, cell-to-cell depolarization taking place entirely outside the fast His-Purkinje
system. The compensatory pause confirms the SA node was not reset by the ectopic
beat.
Q9: An ECG tracing reveals independent atrial and ventricular activity. The P-P interval is
regular at 90 bpm. The R-R interval is regular at 35 bpm with wide QRS complexes. What
is the diagnosis? A) Second-Degree AV Block Type II B) Third-Degree (Complete) AV Block C)
Sinus Bradycardia with PVCs D) Idioventricular Rhythm
● The Answer: B. Third-Degree (Complete) AV Block.
● Distractor Analysis: In Type II block, conducted P waves maintain a fixed PR interval.
Idioventricular rhythms lack P waves entirely.
● The Mentor's Analysis: This represents total AV dissociation. The atria are firing at their
intrinsic rate, but zero impulses cross the AV node. The ventricles generate a slow escape
rhythm at their intrinsic rate (20-40 bpm) to sustain perfusion.
Q10: A pacemaker is set to VVI mode at 60 bpm. The ECG shows pacemaker spikes
occurring at exactly 60 bpm, but none of the spikes are followed by a QRS complex. The
patient's intrinsic rate is 30 bpm. This represents: A) Failure to Sense B) Failure to Capture
C) Pacemaker Mediated Tachycardia D) Normal Pacemaker Function
● The Answer: B. Failure to Capture.
● Distractor Analysis: Failure to sense means spikes land inappropriately on intrinsic
beats. The pacemaker is delivering the electrical energy (the spike), so it is not failure to
pace.
● The Mentor's Analysis: The device fires appropriately, but the myocardium does not
depolarize. This is an acute emergency. Causes include lead dislodgement, wire fracture,
or increased tissue thresholds due to localized ischemia or hyperkalemia.
Exam A: The Elite Test Bank
(2026/2027 Standards)
PART I: THE PRIMER
Mastery of clinical electrophysiology separates the elite practitioner from the liability. In 2026,
relying solely on artificial intelligence for rhythm interpretation is professional suicide; you must
own the diagnostic intuition to intervene decisively and save the patient.
The "Panic Button" Cheat Sheet:
● Hemodynamic Instability: Mandates immediate synchronized cardioversion or
unsynchronized defibrillation.
● Wide & Fast (QRS >0.12s, Rate >100): Presume Ventricular Tachycardia (VT) until
proven otherwise. Administration of calcium channel blockers here is lethal.
● Pacemaker Spike + No QRS: Failure to Capture.
● Pacemaker Spike inside QRS/T: Failure to Sense (Undersensing).
● AHA 2025 Cardioversion Update: Minimum 200J initial biphasic shock for Atrial
Fibrillation/Flutter.
● AHA 2025 Access Update: Intravenous (IV) access is strictly preferred over
Intraosseous (IO) for cardiac arrest.
PART II: THE ELITE TEST BANK
Q1: A patient’s electrocardiogram reveals a regular rhythm with a rate of 72 bpm. The PR
interval measures 0.16 seconds, and the QRS complex measures 0.08 seconds. What is
the precise clinical interpretation? A) First-Degree AV Block B) Normal Sinus Rhythm C)
Accelerated Junctional Rhythm D) Sinus Rhythm with Bundle Branch Block
● The Answer: B. Normal Sinus Rhythm.
● Distractor Analysis: Option A requires a PR interval exceeding 0.20 seconds. Option C
lacks an upright P wave or features an inverted P wave. Option D requires a QRS
complex duration greater than 0.12 seconds.
● The Mentor's Analysis: This is the foundational baseline. Normal PR interval spans
0.12-0.20 seconds; normal QRS is less than 0.12 seconds. You cannot identify pathology
until you establish the rigid mathematical boundaries of normal cellular depolarization and
electrophysiology.
Q2: A 6-second rhythm strip demonstrates an irregularly irregular rhythm, no discernible
P waves, and a fibrillatory baseline. The QRS duration is 0.08 seconds, and there are 12
QRS complexes in the strip. What is the correct interpretation? A) Atrial Flutter with
variable block B) Ventricular Fibrillation C) Atrial Fibrillation with Rapid Ventricular Response
(RVR) D) Wandering Atrial Pacemaker
● The Answer: C. Atrial Fibrillation with Rapid Ventricular Response (RVR).
, ● Distractor Analysis: Option A requires distinct sawtooth flutter waves. Option B is a
lethal, wide-complex pulseless arrest rhythm. Option D requires at least three distinct
P-wave morphologies, which are absent here.
● The Mentor's Analysis: Twelve complexes in 6 seconds equals a rate of 120 bpm. An
irregularly irregular rhythm with an absent atrial kick defines Atrial Fibrillation. A
ventricular rate exceeding 100 bpm classifies it strictly as RVR, requiring immediate
assessment of hemodynamic stability.
Q3: A rhythm strip demonstrates regular P waves at a rate of 300 bpm with a
characteristic sawtooth pattern. The QRS complexes occur regularly at a rate of 75 bpm.
What is the precise conduction ratio? A) 2:1 B) 3:1 C) 4:1 D) Variable
● The Answer: C. 4:1.
● Distractor Analysis: The atrial rate is 300; the ventricular rate is 75. A 2:1 block would
yield a ventricular rate of 150 bpm. Variable block produces an irregular ventricular
rhythm, which contradicts the stem.
● The Mentor's Analysis: Three hundred divided by 75 equals 4. The atrioventricular (AV)
node is protecting the ventricles by blocking three out of every four atrial impulses. This
reflects a stable, fixed macro-reentrant circuit typical of typical Atrial Flutter.
Q4: A regular rhythm is observed at a rate of 45 bpm. P waves are entirely absent from
the tracing. The QRS complex measures 0.10 seconds. What is the defining rhythm? A)
Sinus Bradycardia B) Junctional Escape Rhythm C) Idioventricular Rhythm D) Second-Degree
AV Block Type II
● The Answer: B. Junctional Escape Rhythm.
● Distractor Analysis: Option A explicitly requires an upright P wave in lead II. Option C
features a wide QRS (>0.12s) due to its ventricular origin. Option D features P waves that
fail to conduct.
● The Mentor's Analysis: The AV junction has assumed pacing control due to SA node
failure. The intrinsic pacing rate of the AV node is 40-60 bpm, producing a narrow QRS
because conduction down the bundle of His remains completely intact.
Q5: A patient’s rhythm is regular at 85 bpm. A premature, narrow QRS complex occurs,
preceded by an abnormally shaped P wave that is partially hidden in the preceding T
wave. What is this ectopic beat? A) Premature Ventricular Contraction (PVC) B) Premature
Junctional Contraction (PJC) C) Premature Atrial Contraction (PAC) D) Aberrant Ventricular
Beat
● The Answer: C. Premature Atrial Contraction (PAC).
● Distractor Analysis: PVCs are wide and lack preceding P waves. PJCs lack an upright P
wave (often inverted or absent). Aberrancy strictly involves a wide QRS complex.
● The Mentor's Analysis: An ectopic atrial focus fired before the SA node's scheduled
depolarization. The key identifier is the abnormal P wave morphology, proving the impulse
originated in the atria but outside the sinus node.
Q6: An ECG shows a regular rhythm at 70 bpm. Every P wave is followed by a QRS
complex, but the PR interval is constant at 0.28 seconds. What is the correct rhythm
classification? A) Normal Sinus Rhythm B) First-Degree AV Block C) Second-Degree AV Block
Type I D) Second-Degree AV Block Type II
● The Answer: B. First-Degree AV Block.
● Distractor Analysis: NSR dictates a PR interval <0.20s. Type I features a progressively
lengthening PR interval. Type II drops QRS complexes entirely.
● The Mentor's Analysis: First-degree block is not a true "block" but a consistent
conduction delay at the AV node. Every impulse eventually conducts to the ventricles, but
, the conduction velocity is impaired, pushing the interval beyond the 0.20-second
threshold.
Q7: A rhythm strip shows a progressive lengthening of the PR interval until a P wave
appears without a subsequent QRS complex. The sequence then resets. What is the
clinical name for this phenomenon? A) Mobitz Type II B) Complete Heart Block C)
Wenckebach (Mobitz Type I) D) Non-conducted PAC
● The Answer: C. Wenckebach (Mobitz Type I).
● Distractor Analysis: Mobitz II drops beats without any progressive PR lengthening.
Complete block features total AV dissociation. A non-conducted PAC is an isolated
ectopic event, not a predictable cyclical pattern.
● The Mentor's Analysis: The AV node progressively fatigues with each beat until it
completely blocks an impulse, then recovers during the pause. The professional heuristic
is "long, longer, longest, drop". It is typically a benign nodal phenomenon.
Q8: A patient is in a regular sinus rhythm at 80 bpm. Suddenly, a wide, bizarre QRS
complex measuring 0.16 seconds appears without a preceding P wave. A fully
compensatory pause follows. This describes a: A) Premature Atrial Contraction with
aberrancy B) Premature Ventricular Contraction (PVC) C) Junctional Escape Beat D) Ashman
Phenomenon
● The Answer: B. Premature Ventricular Contraction (PVC).
● Distractor Analysis: PACs have identifiable P waves. Junctional beats are typically
narrow. Ashman phenomenon occurs specifically in irregular rhythms (like AFib) with
long-short cycle lengths.
● The Mentor's Analysis: An irritable ventricular focus fired independently. The wide QRS
reflects slow, cell-to-cell depolarization taking place entirely outside the fast His-Purkinje
system. The compensatory pause confirms the SA node was not reset by the ectopic
beat.
Q9: An ECG tracing reveals independent atrial and ventricular activity. The P-P interval is
regular at 90 bpm. The R-R interval is regular at 35 bpm with wide QRS complexes. What
is the diagnosis? A) Second-Degree AV Block Type II B) Third-Degree (Complete) AV Block C)
Sinus Bradycardia with PVCs D) Idioventricular Rhythm
● The Answer: B. Third-Degree (Complete) AV Block.
● Distractor Analysis: In Type II block, conducted P waves maintain a fixed PR interval.
Idioventricular rhythms lack P waves entirely.
● The Mentor's Analysis: This represents total AV dissociation. The atria are firing at their
intrinsic rate, but zero impulses cross the AV node. The ventricles generate a slow escape
rhythm at their intrinsic rate (20-40 bpm) to sustain perfusion.
Q10: A pacemaker is set to VVI mode at 60 bpm. The ECG shows pacemaker spikes
occurring at exactly 60 bpm, but none of the spikes are followed by a QRS complex. The
patient's intrinsic rate is 30 bpm. This represents: A) Failure to Sense B) Failure to Capture
C) Pacemaker Mediated Tachycardia D) Normal Pacemaker Function
● The Answer: B. Failure to Capture.
● Distractor Analysis: Failure to sense means spikes land inappropriately on intrinsic
beats. The pacemaker is delivering the electrical energy (the spike), so it is not failure to
pace.
● The Mentor's Analysis: The device fires appropriately, but the myocardium does not
depolarize. This is an acute emergency. Causes include lead dislodgement, wire fracture,
or increased tissue thresholds due to localized ischemia or hyperkalemia.
