ECG ECG in Clinical Practice 4

Question 1

A patient's rhythm strip shows progressively lengthening PR intervals until a QRS is dropped. What is this called?

Accepted Answer

Second-degree AV block, Mobitz type I (Wenckebach)

Answer

Second-degree AV block, Mobitz type II

Answer

Third-degree AV block

Answer

First-degree AV block

Question 2

During ECG acquisition, a technician should instruct the patient to do what to minimize muscle artifact?

Accepted Answer

Lie still and relax the muscles

Answer

Take rapid deep breaths

Answer

Clench the fists tightly

Answer

Talk continuously

Question 3

The J point on an ECG is located where?

Accepted Answer

Junction between the QRS complex and ST segment

Answer

Peak of the T wave

Answer

Start of the P wave

Answer

Midpoint of the PR interval

Question 4

A heart rate calculated at 45 bpm with normal P waves before each QRS indicates what rhythm?

Accepted Answer

Sinus bradycardia

Answer

Sinus tachycardia

Answer

Atrial flutter

Answer

Ventricular fibrillation

Question 5

How much does each small square on standard ECG paper represent horizontally in time?

Accepted Answer

0.04 seconds

Answer

0.20 seconds

Answer

0.10 seconds

Answer

0.01 seconds

Question 6

Which precaution is essential when performing an ECG on a patient with a pacemaker?

Accepted Answer

Note pacemaker presence and look for pacing spikes

Answer

Remove the pacemaker before recording

Answer

Turn off the ECG filter completely

Answer

Place all electrodes on one arm

Question 7

A sawtooth (F wave) baseline at about 300 atrial beats per minute suggests which arrhythmia?

Accepted Answer

Atrial flutter

Answer

Atrial fibrillation

Answer

Sinus arrhythmia

Answer

Ventricular tachycardia