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 _2 receptors

B. Decreased
ring rate of

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 _2 receptors

B. Decreased
ring rate of vagal neurons

C. Increased
ring rate of aortic baroreceptors

D. Activation
of cardiac _2 autoreceptors

E. Decreased
ring rate of carotid chem oreceptors

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