ECG ECG Rhythm Interpretation 2

Question 1

A rhythm strip shows no identifiable P waves and a chaotic, irregularly irregular baseline with a ventricular rate of 130 bpm. What rhythm is this?

Accepted Answer

Atrial fibrillation

Answer

Absent P waves with an irregularly irregular ventricular response is the hallmark of atrial fibrillation.

Question 2

A sawtooth baseline pattern with atrial waves at about 300 bpm and a regular 2:1 ventricular response best describes which rhythm?

Accepted Answer

Atrial flutter

Answer

The sawtooth flutter waves near 300 bpm with a fixed conduction ratio are classic for atrial flutter.

Question 3

On a normal ECG, which part of the conduction system creates the brief pause seen in the PR interval?

Accepted Answer

AV node

Answer

The AV node deliberately delays the impulse, producing the PR interval and allowing ventricular filling.

Question 4

A wide-complex regular tachycardia at 180 bpm with no visible P waves is most concerning for which rhythm?

Accepted Answer

Ventricular tachycardia

Answer

A regular wide-QRS tachycardia without P waves should be treated as ventricular tachycardia until proven otherwise.

Question 5

Which finding on a rhythm strip indicates a normal sinus rhythm?

Accepted Answer

Upright P wave before every QRS at 60-100 bpm

Answer

Normal sinus rhythm shows a consistent upright P wave preceding each QRS at a rate of 60-100 bpm.

ECG (Electrocardiogram) Practice Test