A patient, who is experiencing some angina associated with atrial tachycardia, has been placed on verapamil (Calan), a calcium channel blocker
Knowing that this medication blocks the slow calcium channels, thereby depressing phase 4 and lengthening phases 1 and 2 action potential, the nurse should assess this patient for which of the following adverse reactions?
A)
Bradycardia
B)
Ventricular tachycardia
C)
Sudden cardiac death
D)
Increased cardiac output
Ans:
A
Feedback:
Calcium channel blockers (CCB) are used to slow the SA node pacemaker and inhibit conduction in the AV node, slowing the ventricular response in atrial tachycardias. Therefore, the nurse should be aware that it may cause bradycardia. CCB are not known to cause VT or sudden death. These medications reduce the force of myocardial contractility, thereby decreasing myocardial O2 demand. They do not increase cardiac output.
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