13585 12850 160 200 190/124 16082 175/110 13590 210 Epinephrine before phentolamine 12585 100/35 HR 210 Epinephrine after phentolamine Top: Effects of phentolamine, an areceptor-blocking drug, on blood pressure in an anesthetized dog. Epinephrine reversal is demonstrated by tracings showing the response to epinephrine before (middle)and after(bottom) phentolamine. All drugs given intravenously. (BP, blood pressure HR, heart rate. Epinephrine reversal(肾上腺素作用的翻转)Epinephrine reversal （肾上腺素作用的翻转）