NCCT Electrocardiography Technician Fundamentals 2

Question 1

On ECG graph paper, each small box represents how many seconds at standard speed?

Accepted Answer

0.04 seconds

Answer

At standard ECG paper speed of 25 mm/sec, each small (1 mm) box represents 0.04 seconds.

Question 2

Atrial fibrillation is characterized by which ECG finding?

Accepted Answer

Absent P waves with an irregularly irregular rhythm

Answer

Atrial fibrillation shows no identifiable P waves and an irregularly irregular ventricular rhythm due to chaotic atrial activity.

Question 3

Which ECG change is classically associated with acute myocardial infarction?

Accepted Answer

ST segment elevation

Answer

ST segment elevation in contiguous leads is a classic ECG sign of acute ST-elevation myocardial infarction (STEMI).

Question 4

A heart rate of 150 bpm with a narrow QRS and no visible P waves is most consistent with:

Accepted Answer

Supraventricular tachycardia (SVT)

Answer

A narrow-complex tachycardia at 150 bpm without visible P waves is characteristic of supraventricular tachycardia (SVT).

Question 5

Proper skin preparation before applying ECG electrodes includes:

Accepted Answer

Shaving excess hair and cleaning the skin with alcohol

Answer

Shaving excess hair and cleansing the skin with alcohol removes oils and dead skin cells to improve electrode contact.

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