NHI Electrocardiography and Cardiac Monitoring 3

Question 1

Atrial fibrillation on an ECG is characterized by:

Accepted Answer

Absent P waves and an irregularly irregular ventricular rhythm

Answer

Atrial fibrillation produces no identifiable P waves and an irregularly irregular ventricular response due to chaotic atrial electrical activity.

Question 2

A heart rate of 150 bpm with a regular rhythm and narrow QRS complexes is most consistent with:

Accepted Answer

Supraventricular tachycardia (SVT)

Answer

SVT typically presents with a rapid, regular rate (often 150–250 bpm) and narrow QRS complexes because ventricular conduction follows the normal pathway.

Question 3

In ventricular fibrillation (VF), the ECG shows:

Accepted Answer

Chaotic, disorganized electrical activity with no recognizable waves

Answer

Ventricular fibrillation produces completely disorganized electrical activity with no identifiable P waves, QRS complexes, or T waves, resulting in no effective cardiac output.

Question 4

First-degree AV block is defined on an ECG by:

Accepted Answer

A consistently prolonged PR interval greater than 0.20 seconds

Answer

First-degree AV block is defined by a PR interval consistently exceeding 0.20 seconds, indicating slowed but uninterrupted conduction through the AV node.

Question 5

If a patient's ECG shows a completely flat line (asystole), the technician should:

Accepted Answer

Check leads and connections first, then notify the physician immediately if confirmed

Answer

Before assuming true asystole, the technician must verify electrode connections and lead placement; if asystole is confirmed, the physician must be notified immediately for emergency response.

(NHI) National Healthcareer Institute Certification Practice Test

(NHI) National Healthcareer Institute Certification Practice Test

NHI Electrocardiography and Cardiac Monitoring 3