EKG certification Certification EKG Heart Rate & Rhythm Analysis 1

Question 1

When using the 6-second strip method to calculate heart rate, the number of R waves counted within the strip is multiplied by which number?

Accepted Answer

10

Answer

6

Answer

15

Answer

20

Question 2

A patient's EKG shows exactly 8 large boxes between two consecutive R waves. Using the large-box (300) method, what is the approximate heart rate?

Accepted Answer

38 bpm

Answer

50 bpm

Answer

75 bpm

Answer

150 bpm

Question 3

An EKG rhythm strip shows upright, uniform P waves before every QRS complex, a PR interval of 0.16 seconds, a regular R-R interval, and a rate of 78 bpm. This rhythm is most consistent with which of the following?

Accepted Answer

Normal sinus rhythm

Answer

Sinus bradycardia

Answer

Accelerated junctional rhythm

Answer

First-degree AV block

Question 4

A CNA notices on an EKG rhythm strip that the R-R intervals lengthen slightly during inspiration and shorten during expiration, but the P wave morphology remains normal. This finding is most consistent with which rhythm?

Accepted Answer

Sinus arrhythmia

Answer

Wandering atrial pacemaker

Answer

Atrial flutter

Answer

Second-degree AV block type I

Question 5

An EKG strip shows a rapid, narrow-complex rhythm at 190 bpm with no clearly identifiable P waves preceding the QRS complexes. Which rhythm does this most likely represent?

Accepted Answer

Supraventricular tachycardia (SVT)

Answer

Ventricular tachycardia

Answer

Sinus tachycardia

Answer

Accelerated idioventricular rhythm

Question 6

On a rhythm strip, the R-R interval measures 25 small boxes. Using the small-box method (1500 ÷ number of small boxes), what is the heart rate?

Accepted Answer

60 bpm

Answer

50 bpm

Answer

75 bpm

Answer

100 bpm