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

Progressive PR prolongation followed by a dropped beat characterizes Mobitz type I (Wenckebach).

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

Lying still and relaxed minimizes somatic muscle tremor artifact.

Question 3

The J point on an ECG is located where?

Accepted Answer

Junction between the QRS complex and ST segment

Answer

The J point marks the junction where the QRS complex ends and the ST segment begins.

Question 4

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

Accepted Answer

Sinus bradycardia

Answer

A regular rhythm under 60 bpm with normal P waves is sinus bradycardia.

Question 5

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

Accepted Answer

0.04 seconds

Answer

Each small horizontal box equals 0.04 seconds at standard paper speed.

ECG (Electrocardiogram) Practice Test