?-Adrenergic blocking agents, such as propranolol, can cause:
a. sinoatrial block. c. sinus bradycardia.
b. sinus tachycardia. d. premature atrial beats.
ANS: C
?-Adrenergic blocking agents block stimulation by the sympathetic nervous system, causing the heart to slow down its rate. This can lead to sinus bradycardia.
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