Diagnostic Procedures and ECG Flashcards

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

Answer: 0.12–0.20 seconds

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

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

Answer: 25 mm/sec

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

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

Answer: Keep a diary of activities and symptoms during the recording period

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

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

Answer: Absence of P waves with irregular QRS complexes

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

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

Answer: Pulse oximeter

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

During spirometry testing, what instruction should the MA give to the patient before the test?

Answer: Avoid using bronchodilators as directed by the physician prior to testing

Bronchodilators may be withheld before spirometry to obtain baseline measurements unless the physician orders otherwise.