CRAT - Certified Rhythm Analysis Technician Sinus Rhythm Interpretation Questions and Answers

Question 1

A rhythm strip shows an upright P wave before every QRS complex, a regular R-R interval, a ventricular rate of 72 bpm, a PR interval of 0.16 seconds, and a QRS duration of 0.08 seconds.
How would this rhythm be interpreted?

Accepted Answer

Normal Sinus Rhythm

Answer

Sinus Bradycardia

Answer

Sinus Tachycardia

Answer

Sinus Arrhythmia

Question 2

A Certified Rhythm Analysis Technician is reviewing an ECG strip and notes that the only abnormality is a heart rate of 48 beats per minute. All other parameters (P wave, PR interval, QRS complex, and regularity) are within normal limits. Which rhythm is most likely present?

Accepted Answer

Sinus Bradycardia

Answer

Normal Sinus Rhythm

Answer

Sinus Arrhythmia

Answer

Junctional Rhythm

Question 3

Which of the following is the defining characteristic of Sinus Arrhythmia?

Accepted Answer

An irregular rhythm that varies with respiration

Answer

A heart rate consistently above 100 bpm

Answer

The absence of P waves

Answer

A progressively lengthening PR interval

Question 4

A patient's ECG shows a regular rhythm with a rate of 110 bpm. There is a P wave before each QRS complex, the PR interval is 0.14 seconds, and the QRS duration is 0.06 seconds. This rhythm is identified as:

Accepted Answer

Sinus Tachycardia

Answer

Normal Sinus Rhythm

Answer

Atrial Fibrillation

Answer

Ventricular Tachycardia

Question 5

To be classified as a sinus rhythm, which of the following criteria regarding the PR interval must be met?

Accepted Answer

It must be between 0.12 and 0.20 seconds.

Answer

It must be less than 0.12 seconds.

Answer

It must be greater than 0.20 seconds.

Answer

It must vary with each beat.

Question 6

A CRAT observes a rhythm strip where the P-P intervals and R-R intervals vary. The overall heart rate is 70 bpm, P waves are present and uniform, the PR interval is constant at 0.18 seconds, and the QRS is narrow. This description is most consistent with:

Accepted Answer

Sinus Arrhythmia

Answer

Normal Sinus Rhythm

Answer

Sinus Bradycardia

Answer

Atrial Flutter