ECG ECG Pharmacology and Cardiac Medications

Question 1

Which ECG change is most commonly associated with digoxin toxicity?

Accepted Answer

Prolonged PR interval and ST scooping

Answer

Short QT interval and tall T waves

Answer

Wide QRS with right bundle branch block pattern

Answer

Peaked P waves and shortened PR interval

Question 2

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

Accepted Answer

Prolonged QT interval

Answer

Shortened QT interval

Answer

Delta waves

Answer

Shortened PR interval

Question 3

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

Accepted Answer

Class I

Answer

Class II

Answer

Class III

Answer

Class IV

Question 4

A patient receiving IV adenosine for SVT would most likely show which transient ECG finding immediately after the dose?

Accepted Answer

Complete heart block or brief asystole

Answer

Ventricular tachycardia

Answer

Atrial fibrillation

Answer

Prolonged QT interval

Question 5

Hyperkalemia caused by potassium-sparing diuretics (e.g., spironolactone) would first appear on the ECG as:

Accepted Answer

Peaked, narrow T waves

Answer

Flat T waves

Answer

Prolonged QT interval

Answer

Short PR interval

Question 6

Which beta-blocker effect on the ECG helps an ECG technician recognize its therapeutic use?

Accepted Answer

Prolonged PR interval and slower heart rate

Answer

Shortened PR interval and faster heart rate

Answer

Widened QRS and peaked T waves

Answer

Delta waves on multiple leads

Question 7

A patient on a calcium channel blocker (e.g., verapamil) is expected to show which ECG change?

Accepted Answer

Prolonged PR interval

Answer

Shortened PR interval

Answer

Widened QRS complex

Answer

Elevated ST segments