CCMA EKG Administration 5

Question 1

Which lead is considered the 'Gold Standard' for detecting ST-segment changes associated with myocardial infarction of the inferior wall?

Accepted Answer

Leads II, III, and aVF

Answer

Inferior wall MI changes are best seen in the inferior leads: II, III, and aVF, which look at the bottom of the heart.

Question 2

A patient's EKG shows no P waves and an irregularly irregular rhythm. This pattern is MOST consistent with:

Accepted Answer

Atrial fibrillation

Answer

The absence of distinct P waves combined with an irregularly irregular ventricular rhythm is the hallmark of atrial fibrillation.

Question 3

Before applying EKG electrodes, the medical assistant should prepare the patient's skin by:

Accepted Answer

Cleaning with alcohol and allowing it to dry completely

Answer

Cleaning the skin with alcohol removes oils and debris, and allowing it to dry prevents interference with electrode adhesion and conductivity.

Question 4

The PR interval on an EKG normally measures:

Accepted Answer

0.12 to 0.20 seconds

Answer

A normal PR interval ranges from 0.12 to 0.20 seconds (3–5 small squares), representing atrial depolarization and AV node conduction delay.

Question 5

Which of the following is the CORRECT placement for lead aVR?

Accepted Answer

Right arm electrode is the positive pole

Answer

In augmented lead aVR, the right arm electrode serves as the positive pole, and it views the heart from the right shoulder perspective.

CCMA - Certified Clinical Medical Assistant Practice Test