Objective To investigate the desensitization of acetylcholine (ACh) on the inhibition effects of blood pressure (BP) in anesthe tized canine and build a model for studying desensitization in vivo. Methods Through ...Objective To investigate the desensitization of acetylcholine (ACh) on the inhibition effects of blood pressure (BP) in anesthe tized canine and build a model for studying desensitization in vivo. Methods Through changing the intervals (120, 100, 80, 60, 40, 20 seconds) of twice ACh administration (each was 15μg·kg -1,i.v.), the desensitization on the effect of systemic blood pressure of the first ACh in jection towards the subsequent ACh administration was observed. Results When ACh administration intervals were 40, 60, 80 , 100 seconds, the percentages of desensitization of ACh on systemic blood press ure were significantly increased (P<0.05). However, as the intervals were 20 and 120 seconds, the effects of twice ACh administration had no significant dif ference (P>0.05). Conclusion The results indicated that ACh contents in blo od might influence the action of next ACh administration. To some extent, the hi gher the concentration of ACh in blood, the bigger the ratio of desensitization of exogenous ACh is. In addition, this method of twice drug administration could be used as a model of studying desensitization in vivo.展开更多
文摘Objective To investigate the desensitization of acetylcholine (ACh) on the inhibition effects of blood pressure (BP) in anesthe tized canine and build a model for studying desensitization in vivo. Methods Through changing the intervals (120, 100, 80, 60, 40, 20 seconds) of twice ACh administration (each was 15μg·kg -1,i.v.), the desensitization on the effect of systemic blood pressure of the first ACh in jection towards the subsequent ACh administration was observed. Results When ACh administration intervals were 40, 60, 80 , 100 seconds, the percentages of desensitization of ACh on systemic blood press ure were significantly increased (P<0.05). However, as the intervals were 20 and 120 seconds, the effects of twice ACh administration had no significant dif ference (P>0.05). Conclusion The results indicated that ACh contents in blo od might influence the action of next ACh administration. To some extent, the hi gher the concentration of ACh in blood, the bigger the ratio of desensitization of exogenous ACh is. In addition, this method of twice drug administration could be used as a model of studying desensitization in vivo.
