CCT CCT - Certified Cardiographic Technician Cardiac Medications and ECG Effects Questions and Answers 1

Question 1

Which ECG change is most commonly associated with digoxin toxicity?

Accepted Answer

Prolonged PR interval with scooped ST depression

Answer

Digoxin toxicity classically produces a prolonged PR interval and the characteristic 'scooped' or 'Salvador Dali mustache' ST depression pattern.

Question 2

A patient taking amiodarone is most likely to show which ECG finding?

Accepted Answer

Prolonged QT interval

Answer

Amiodarone prolongs repolarization, resulting in a lengthened QT interval, which increases the risk for torsades de pointes.

Question 3

Which class of antiarrhythmic drugs works primarily by blocking sodium channels and is known to widen the QRS complex?

Accepted Answer

Class I (sodium channel blockers)

Answer

Class I antiarrhythmics (e.g., flecainide, quinidine) block fast sodium channels, slowing conduction and widening the QRS complex.

Question 4

Beta-blockers (Class II antiarrhythmics) produce which primary ECG effect?

Accepted Answer

Prolonged PR interval and slowed heart rate

Answer

Beta-blockers slow AV nodal conduction, prolonging the PR interval, and decrease the overall heart rate by reducing sympathetic drive.

Question 5

Hyperkalemia is most associated with which ECG change?

Accepted Answer

Peaked, tall T waves

Answer

Elevated serum potassium causes tall, peaked, narrow T waves, which are often the earliest ECG sign of hyperkalemia.

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