EKG certification Certification EKG Arrhythmias & Dysrhythmias 1

Question 1

A rhythm strip shows a regular rhythm at 60 bpm with a PR interval of 0.28 seconds that remains constant throughout. QRS complexes are narrow. What is the most likely interpretation?

Accepted Answer

First-degree AV block

Answer

Second-degree AV block Type I (Wenckebach)

Answer

Third-degree AV block

Answer

Junctional rhythm

Question 2

A patient's EKG shows progressive lengthening of the PR interval over several beats, followed by a non-conducted P wave (dropped QRS), then the cycle repeats. Which dysrhythmia does this describe?

Accepted Answer

Second-degree AV block Type I (Wenckebach)

Answer

First-degree AV block

Answer

Second-degree AV block Type II (Mobitz II)

Answer

Complete heart block

Question 3

On a 12-lead EKG, a patient shows a short PR interval (<0.12 seconds) and a slurred upstroke at the beginning of the QRS complex (delta wave) with a widened QRS. The patient complains of palpitations. What is the most likely diagnosis?

Accepted Answer

Wolff-Parkinson-White (WPW) syndrome

Answer

Right bundle branch block

Answer

Left ventricular hypertrophy

Answer

Accelerated idioventricular rhythm

Question 4

You observe a rhythm strip with no discernible P waves, a regular ventricular rate of 38 bpm, and wide, bizarre QRS complexes. The patient is hemodynamically unstable. What rhythm is this?

Accepted Answer

Idioventricular rhythm

Answer

Accelerated junctional rhythm

Answer

Third-degree AV block with junctional escape

Answer

Atrial flutter with aberrant conduction

Question 5

A patient's rhythm strip shows a regular P-to-P interval and a regular R-to-R interval, but the PR intervals vary with no consistent relationship between P waves and QRS complexes. The ventricular rate is slower than the atrial rate. What is this rhythm?

Accepted Answer

Third-degree (complete) AV block

Answer

Second-degree AV block Type II

Answer

Atrial tachycardia with variable block

Answer

Accelerated idioventricular rhythm

Question 6

A patient presents with a sudden-onset regular tachycardia at 170 bpm. The EKG shows narrow QRS complexes and retrograde P waves buried in or just after the QRS. Vagal maneuvers terminate the rhythm abruptly. What is the most likely diagnosis?

Accepted Answer

Atrioventricular nodal reentrant tachycardia (AVNRT)

Answer

Atrial flutter

Answer

Multifocal atrial tachycardia

Answer

Accelerated junctional rhythm