A 43-year-old wom an was in the em ergency departm ent for the treatm ent of shock due to spinal…

A 43-year-old wom an was in the em ergency departm ent for the treatm ent of shock due to spinal traum a. Despite uid therapy, she was still hypotensive (80/50 m m Hg) and tachycardic (125 bpm ). An intravenous infusion of norepinephrine was started, and a few m inutes later the blood pressure was 120/85 m m Hg, and the heart rate decreased to 85 bpm . W hich of the follow ing actions best explains the druginduced decrease of heart rate in this patient? A. Activation of cardiac ß2 receptors B. Decreased ring rate of vagal neurons C. Increased ring rate of aortic baroreceptors D. Activation of cardiac a2 autoreceptors E. Decreased ring rate of carotid chem oreceptors

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