ACSM-EP Electrocardiography 4

Question 1

Which of the following correctly describes first-degree AV block?

Accepted Answer

PR interval >0.20 seconds with all P waves conducted

Answer

First-degree AV block is defined by a PR interval consistently greater than 0.20 seconds (one large square), with every P wave followed by a QRS complex.

Question 2

What ECG pattern is associated with right ventricular strain during exercise?

Accepted Answer

S1Q3T3 pattern with ST changes in right precordial leads

Answer

Right ventricular strain classically produces an S wave in lead I, Q wave in lead III, and T-wave inversion in lead III (S1Q3T3), often with right precordial ST changes.

Question 3

During exercise testing, at what point past the J-point should ST-segment displacement be measured?

Accepted Answer

80 ms (2 small squares)

Answer

The standard for measuring exercise-induced ST depression is 80 ms (2 small squares) after the J-point to allow the ST segment to stabilize after the QRS complex.

Question 4

A patient taking digoxin shows which characteristic ECG finding?

Accepted Answer

Scooped (reversed tick) ST-segment depression

Answer

Digoxin produces a characteristic 'scooped' or reversed-tick ST-segment depression, especially in lateral leads, which is a normal therapeutic finding distinct from ischemia.

Question 5

Which finding on a resting ECG would be an absolute contraindication to initiating an exercise stress test?

Accepted Answer

Uncontrolled ventricular tachycardia

Answer

Uncontrolled ventricular tachycardia is an absolute contraindication to exercise testing because exercise could precipitate ventricular fibrillation.

ACSM Practice Test

ACSM Practice Test

ACSM-EP Electrocardiography 4