CCI ECG Rhythm Interpretation 5

Question 1

Which ECG pattern is associated with Brugada syndrome?

Accepted Answer

Coved ST elevation in V1–V2 with RBBB morphology

Answer

Brugada syndrome shows a characteristic coved-type ST elevation (≥2 mm) with RBBB morphology in leads V1–V2, linked to risk of sudden cardiac death.

Question 2

What is the corrected QT interval (QTc) formula using Bazett's correction?

Accepted Answer

QT divided by the square root of the RR interval (in seconds)

Answer

Bazett's formula corrects the QT interval for heart rate: QTc = QT / √RR, where RR is measured in seconds.

Question 3

A patient's rhythm strip shows grouped beating with progressively lengthening PR intervals until a P wave fails to conduct. What is the rhythm?

Accepted Answer

Second-degree AV block, Mobitz type I (Wenckebach)

Answer

Wenckebach (Mobitz I) is defined by progressive PR prolongation followed by a non-conducted P wave, then the cycle repeats.

Question 4

In left bundle branch block (LBBB), which leads typically show broad monophasic R waves?

Accepted Answer

I, aVL, V5, V6

Answer

LBBB produces broad, notched, or slurred monophasic R waves in the lateral leads (I, aVL, V5, V6) due to delayed left ventricular depolarization.

Question 5

A post-cardiac surgery patient's ECG shows alternating electrical axis with every other beat. What is this finding called?

Accepted Answer

Electrical alternans

Answer

Electrical alternans is the beat-to-beat alternation in QRS amplitude or axis, classically associated with pericardial effusion and cardiac tamponade.

CCI - Cardiovascular Credentialing International Practice Test

CCI - Cardiovascular Credentialing International Practice Test

CCI ECG Rhythm Interpretation 5