A 51-year-old m an was adm itted to the coronary care unit w ith a diagnosis of m yocardial…

A 51-year-old m an was adm itted to the coronary care unit w ith a diagnosis of m yocardial infarction. Two hours later, he developed ventricular brillation and was de brillated im – m ediately, but w ithout success. Cardiopulm onary resuscitation (CPR) was started, and two additional shocks were given at a higher energy, but the patient rem ained unresponsive. At this tim e a bolus of intravenous epinephrine was given, w hile continuing the CPR. Which of the follow ing receptor actions of the drug best describes the rationale for adding epinephrine in this setting? A. a1 receptor-m ediated vasoconstriction B. ß2 receptor-m ediated vasodilation C. ß2 receptor-m ediated increase in cardiac contractility D. ß1 receptor-m ediated increase in renin secretion E. ß2 receptor-m ediated bronchodilation

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