CCT CCT - Certified Cardiographic Technician Cardiac Medications and ECG Effects Questions and Answers 2

Question 1

Hypokalemia is most likely to produce which ECG abnormality?

Accepted Answer

Prominent U waves and flattened T waves

Answer

Peaked T waves and wide QRS

Answer

Short QT interval

Answer

Tall R waves in V1

Question 2

Which ECG finding is characteristic of hypercalcemia?

Accepted Answer

Shortened QT interval

Answer

Prolonged QT interval

Answer

Widened QRS

Answer

Peaked T waves

Question 3

Tricyclic antidepressant (TCA) overdose is most dangerous on the ECG because it causes:

Accepted Answer

QRS widening greater than 100 ms indicating high risk of arrhythmia

Answer

Shortened PR interval only

Answer

Peaked T waves

Answer

Sinus bradycardia

Question 4

Which medication can cause a 'Osborn wave' (J wave) pattern on the ECG, though it is more commonly seen with hypothermia?

Accepted Answer

Hypothermia alone causes it; no medication independently replicates it consistently

Answer

Digoxin

Answer

Amiodarone

Answer

Adenosine

Question 5

A patient on procainamide (Class IA agent) develops a wide-complex tachycardia resembling torsades de pointes. What ECG clue before treatment would have predicted this risk?

Accepted Answer

Prolonged QT interval

Answer

Short PR interval

Answer

Right bundle branch block pattern

Answer

Low-voltage QRS

Question 6

Calcium channel blockers (Class IV antiarrhythmics) such as verapamil primarily affect which interval on the ECG?

Accepted Answer

PR interval (prolongation)

Answer

QT interval (prolongation)

Answer

QRS duration (widening)

Answer

RR interval shortening