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NTA Pharmacology and Medications Flashcards

6 cards from real NTA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. Which drug classes are known to prolong the QT interval and increase the risk of Torsades de Pointes?

    Answer: Certain antipsychotics and certain antibiotics

    Drugs such as haloperidol (antipsychotic) and azithromycin (antibiotic) can prolong ventricular repolarization, widening the QT interval and predisposing the patient to Torsades de Pointes.

  2. Hypokalemia resulting from diuretic use typically produces which ECG changes?

    Answer: Flattened T waves and prominent U waves

    Low serum potassium flattens or inverts T waves and unmasks the U wave (a positive deflection after the T wave), and increases the risk of ventricular arrhythmias.

  3. Which electrolyte imbalance, commonly caused by medications like potassium-sparing diuretics, produces tall peaked T waves on ECG?

    Answer: Hyperkalemia

    Hyperkalemia causes tall, narrow, tent-shaped T waves on ECG and can progress to widened QRS, sine-wave pattern, and cardiac arrest if untreated.

  4. Calcium channel blocker overdose characteristically produces which ECG finding?

    Answer: Bradycardia with prolonged PR interval and possible heart block

    Calcium channel blockers slow AV node conduction; in overdose this manifests as bradycardia, prolonged PR interval, and potentially complete heart block.

  5. Hypocalcemia — which can be caused by certain medications — produces which ECG change?

    Answer: Prolonged QT interval

    Hypocalcemia delays ventricular repolarization, lengthening the QT interval on ECG and increasing the risk of ventricular arrhythmias.

  6. A patient receiving IV magnesium sulfate develops bradycardia. What is the most likely explanation?

    Answer: Hypermagnesemia slowing cardiac conduction

    Elevated serum magnesium acts as a natural calcium channel antagonist, slowing cardiac conduction and causing bradycardia or heart block in excess.

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  1. nationaltelemetryassociation.org — Test delivery, eligibility, retake policy, test dates, score validity, passing score, time limit · verified Oct 2026