CCT - Certified Cardiographic Technician Cardiac Medications and ECG Effects Questions and Answers Flashcards
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Read the first 6 CCT - Certified Cardiographic Technician Cardiac Medications and ECG Effects Questions and Answers flashcards as text
Which ECG change is most commonly associated with digoxin toxicity?
Answer: Prolonged PR interval with scooped ST depression
Digoxin toxicity classically produces a prolonged PR interval and the characteristic 'scooped' or 'Salvador Dali mustache' ST depression pattern.
A patient taking amiodarone is most likely to show which ECG finding?
Answer: Prolonged QT interval
Amiodarone prolongs repolarization, resulting in a lengthened QT interval, which increases the risk for torsades de pointes.
Which class of antiarrhythmic drugs works primarily by blocking sodium channels and is known to widen the QRS complex?
Answer: Class I (sodium channel blockers)
Class I antiarrhythmics (e.g., flecainide, quinidine) block fast sodium channels, slowing conduction and widening the QRS complex.
Beta-blockers (Class II antiarrhythmics) produce which primary ECG effect?
Answer: Prolonged PR interval and slowed heart rate
Beta-blockers slow AV nodal conduction, prolonging the PR interval, and decrease the overall heart rate by reducing sympathetic drive.
Hyperkalemia is most associated with which ECG change?
Answer: Peaked, tall T waves
Elevated serum potassium causes tall, peaked, narrow T waves, which are often the earliest ECG sign of hyperkalemia.
A patient receiving IV adenosine during an SVT episode would most likely show which transient ECG finding?
Answer: Complete AV block with a brief asystole pause
Adenosine transiently blocks AV conduction, causing a brief period of complete AV block or asystole that typically terminates SVT.