EKG certification Certification EKG Heart Rate & Rhythm Analysis 2

Question 1

A patient's EKG strip shows 18 large boxes between two consecutive R waves. What is the approximate heart rate?

Accepted Answer

83 bpm

Answer

75 bpm

Answer

60 bpm

Answer

100 bpm

Question 2

Which method is most accurate for calculating heart rate on an EKG strip with an irregular rhythm?

Accepted Answer

Count R waves in a 6-second strip and multiply by 10

Answer

Divide 300 by the number of large boxes between R waves

Answer

Divide 1500 by the number of small boxes between R waves

Answer

Use the sequence method starting from an R wave on a dark line

Question 3

An EKG rhythm strip shows a regular rhythm with R-R intervals of exactly 20 small boxes apart. What is the heart rate?

Accepted Answer

75 bpm

Answer

60 bpm

Answer

100 bpm

Answer

150 bpm

Question 4

A rhythm is described as regularly irregular with a repeating pattern of progressively longer R-R intervals followed by a dropped beat. Which rhythm does this most likely represent?

Accepted Answer

Second-degree AV block Type I (Wenckebach)

Answer

Second-degree AV block Type II

Answer

Sinus arrhythmia

Answer

Atrial flutter with variable block

Question 5

On a standard 12-lead EKG, what does a narrow QRS complex (less than 0.12 seconds) indicate about the origin of the rhythm?

Accepted Answer

The impulse originates above the ventricles

Answer

The impulse originates in the ventricles

Answer

The impulse is conducted via an accessory pathway

Answer

The impulse originates in the bundle of His

Question 6

When analyzing an EKG strip, you notice the R-R intervals vary with respiration — shorter during inspiration and longer during expiration. What is the most likely rhythm?

Accepted Answer

Sinus arrhythmia

Answer

Wandering atrial pacemaker

Answer

Multifocal atrial tachycardia

Answer

Premature atrial contractions