EKG certification Certification EKG Interpretation & Waveforms 3

Question 1

A patient's EKG shows a regular narrow-complex tachycardia at 150 bpm with a sawtooth pattern in leads II, III, and aVF. What is the MOST likely rhythm?

Accepted Answer

Atrial flutter with 2:1 block

Answer

A regular narrow-complex tachycardia at exactly 150 bpm with sawtooth flutter waves is the hallmark of atrial flutter with 2:1 conduction.

Question 2

Which EKG finding differentiates ventricular tachycardia from supraventricular tachycardia with aberrant conduction?

Accepted Answer

Presence of AV dissociation

Answer

AV dissociation, where atrial and ventricular activity are independent, is a strong indicator of ventricular tachycardia rather than SVT with aberrancy.

Question 3

In a second-degree AV block Type II (Mobitz II), what is the expected pattern of PR intervals before a dropped QRS?

Accepted Answer

Constant PR intervals with sudden dropped QRS

Answer

Mobitz Type II block shows constant PR intervals with sudden unexpected failure of conduction, resulting in a dropped QRS without prior PR prolongation.

Question 4

An EKG shows ST elevation in leads V1-V4 with reciprocal ST depression in leads II, III, and aVF. Which coronary artery is MOST likely occluded?

Accepted Answer

Left anterior descending artery

Answer

ST elevation in V1-V4 indicates an anterior wall STEMI, which is caused by occlusion of the left anterior descending artery.

Question 5

What is the significance of pathological Q waves on an EKG?

Accepted Answer

They represent prior myocardial infarction with transmural necrosis

Answer

Pathological Q waves (wider than 0.04 seconds or deeper than one-third the R wave height) indicate prior transmural myocardial infarction with permanent tissue death.

EKG certification Practice Test

EKG certification Practice Test

EKG certification Certification EKG Interpretation & Waveforms 3