CCMA EKG Administration 4

Question 1

A patient's EKG shows a prolonged QT interval. Which condition is this finding most commonly associated with?

Accepted Answer

Hypokalemia

Answer

Hypokalemia (low potassium) prolongs the QT interval and can predispose the patient to life-threatening arrhythmias such as torsades de pointes.

Question 2

When placing a V4 precordial lead, the correct anatomical position is:

Accepted Answer

5th intercostal space, midclavicular line

Answer

V4 is placed at the 5th intercostal space at the midclavicular line on the left side of the chest.

Question 3

Which of the following is the correct sequence of electrical conduction in the heart?

Accepted Answer

SA node → AV node → Bundle of His → Purkinje fibers

Answer

Normal cardiac conduction begins at the SA node, travels to the AV node, then through the Bundle of His and Purkinje fibers to depolarize the ventricles.

Question 4

A medical assistant notices the EKG tracing shows a flat, wandering baseline. The MOST likely cause is:

Accepted Answer

Patient movement or breathing

Answer

A wandering baseline is most commonly caused by patient movement, muscle tremor, or breathing artifact during the recording.

Question 5

On a standard EKG strip, the paper speed in the United States is:

Accepted Answer

25 mm/sec

Answer

Standard US EKG paper speed is 25 mm per second, which means each small square represents 0.04 seconds.

CCMA - Certified Clinical Medical Assistant Practice Test

CCMA - Certified Clinical Medical Assistant Practice Test

CCMA EKG Administration 4