CCBMA Diagnostic Procedures and ECG 2

Question 1

Which of the following is a normal PR interval duration on an ECG?

Accepted Answer

0.12–0.20 seconds

Answer

A normal PR interval is 0.12–0.20 seconds, representing conduction from the SA node through the AV node.

Question 2

What is the standard paper speed used for recording a 12-lead ECG in the United States?

Accepted Answer

25 mm/sec

Answer

The standard ECG paper speed in the US is 25 mm/sec, making each small square equal to 0.04 seconds.

Question 3

During a Holter monitor patient education session, the MA should instruct the patient to:

Accepted Answer

Keep a diary of activities and symptoms during the recording period

Answer

A symptom and activity diary allows the physician to correlate ECG findings with the patient's reported events.

Question 4

Which finding on a rhythm strip would prompt the MA to immediately notify the physician?

Accepted Answer

Absence of P waves with irregular QRS complexes

Answer

Absence of P waves with irregular QRS may indicate atrial fibrillation or another serious dysrhythmia requiring physician evaluation.

Question 5

Which of the following is used to measure blood oxygen saturation non-invasively?

Accepted Answer

Pulse oximeter

Answer

A pulse oximeter measures oxygen saturation (SpO2) non-invasively using light absorption through peripheral tissue.

CCBMA - California Certifying Board for Medical Assistants Practice Test