NCLEX PRACTICE QUESTION:
A patient experiencing ventricular tachycardia is given a medication which acts on the phase of the myocardial action potential indicated by the red “X.” Which class of medication will the healthcare provider administer to the patient?
1. Potassium channel blocker
2. Adrenergic agonist
3. Calcium channel blocker
4. Sympathetic
HINTS:
1. The medication will decrease the heart rate and prolong the action potential and refractory period.
2. The dysrhythmia occurs during phase 3 of the action potential.
3. During phase 3 there is rapid repolarization when potassium leaves the cell, so a potassium channel blocker will be administered
ANSWER: A
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