CCI ECG Rhythm Interpretation 4

Question 1

A Holter monitor report shows frequent PVCs occurring every other beat. What is this pattern called?

Accepted Answer

Ventricular bigeminy

Answer

Ventricular bigeminy is the pattern of alternating normal sinus beats and premature ventricular contractions (PVC every other beat).

Question 2

Which ECG criterion is used in the Sgarbossa criteria to identify STEMI in the presence of left bundle branch block (LBBB)?

Accepted Answer

Concordant ST elevation ≥1 mm in any lead

Answer

Sgarbossa's most specific criterion for STEMI in LBBB is concordant ST elevation ≥1 mm (ST in same direction as QRS deflection).

Question 3

On the ECG, the PR interval is measured from:

Accepted Answer

The onset of the P wave to the onset of the QRS complex

Answer

The PR interval represents atrial depolarization and AV node conduction time, measured from the start of the P wave to the start of the QRS.

Question 4

What does a negative P wave in lead aVR typically indicate?

Accepted Answer

Normal sinus rhythm

Answer

A negative (inverted) P wave in aVR is a normal finding in sinus rhythm because the normal P wave vector points away from aVR.

Question 5

Which rhythm is characterized by three or more consecutive PVCs?

Accepted Answer

Ventricular tachycardia

Answer

Three or more consecutive PVCs at a rate >100 bpm defines ventricular tachycardia, a potentially life-threatening arrhythmia.

CCI - Cardiovascular Credentialing International Practice Test