EKG certification Certification EKG Heart Rate & Rhythm Analysis 3

Question 1

Using the sequence method (300-150-100-75-60-50), an R wave falls on a heavy black line and the next R wave falls between the fourth and fifth lines of the sequence. What is the estimated heart rate?

Accepted Answer

Between 60 and 75 bpm

Answer

The fourth heavy line corresponds to 75 bpm and the fifth to 60 bpm, so an R wave falling between them indicates a rate between 60 and 75 bpm.

Question 2

An EKG strip recorded at standard speed (25 mm/sec) is 30 cm long. How many seconds of cardiac activity does this strip represent?

Accepted Answer

12 seconds

Answer

At 25 mm/sec, a 300 mm (30 cm) strip represents 300 ÷ 25 = 12 seconds of recording.

Question 3

A patient presents with a wide QRS complex tachycardia at a rate of 180 bpm. Which feature would most strongly suggest a ventricular origin rather than SVT with aberrancy?

Accepted Answer

AV dissociation visible on the strip

Answer

AV dissociation, where atrial and ventricular activity are independent of each other, is a hallmark finding that confirms ventricular tachycardia.

Question 4

You are analyzing a rhythm strip and count 8 R waves within a 6-second interval. What is the calculated heart rate?

Accepted Answer

80 bpm

Answer

With the 6-second method, multiply the number of R-R intervals (which is one fewer than R waves: 8 − 1 = 7… however, the standard method counts complexes and multiplies by 10, giving 8 × 10 = 80 bpm.

Question 5

Which of the following heart rate ranges is classified as bradycardia in an adult patient?

Accepted Answer

Below 60 bpm

Answer

Bradycardia is defined as a heart rate below 60 beats per minute in an adult patient.

EKG certification Practice Test

EKG certification Practice Test

EKG certification Certification EKG Heart Rate & Rhythm Analysis 3