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DIRECT EFFECTS OF FENTANYL ON CANINE CORONARY ARTERY RINGS

机译:芬太尼对犬冠状动脉环的直接作用

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The potent opioid fentanyl, is commonly used as a general anesthetic for coronary artery bypass surgery. Experiments were designed to determine the direct effects of fentanyl on unstimulated coronary artery tissue. Isolated, endothelium denuded canine epicardial rings were suspended in physiologic tissue baths. Changes in tension were measured as the concentration of fentanyl was increased. Fentanyl caused increases in ring tension at concentrations of 10(-6)M-10(-4)M, then caused a decrease in tension at 10(-3)M. Calcium channel blockade by 10(-7)M nifedipine abolished all increases in contractile responses to fentanyl and prevented the relaxation in tension produced by fentanyl. The fentanyl dose-response curve was unchanged by opioid receptor blockade with 10(-6)M naloxone and by alpha and beta adrenoceptor blockade produced by 10(-6)M prazosin and 10(-6)M propranolol. Muscarinic blockade with 10(-6)M atropine and cyclooxygenase inhibition by 10(-6)M indomethacin attenuated the constrictor response to fentanyl. The opioids alfentanil, sufentanil, morphine, and naloxone all produced a dose-response similar to fentanyl that varied only in amplitude. These findings indicate that increasing concentrations of the anesthestic opioid fentanyl can cause biphasic changes in basal canine epicardial coronary artery ring tension. These responses are calcium dependent and may be characteristic of other opioid agonists and antagonists. [References: 27]
机译:强效的阿片类药物芬太尼通常用作冠状动脉搭桥手术的全身麻醉剂。设计实验以确定芬太尼对未刺激的冠状动脉组织的直接作用。将分离的内皮剥除的犬心外膜环悬挂在生理组织浴中。随着芬太尼浓度的增加,测量张力的变化。芬太尼在10(-6)M-10(-4)M浓度下引起环张力增加,然后在10(-3)M引起张力降低。钙通道被10(-7)M硝苯地平阻滞,消除了所有对芬太尼的收缩反应的增加,并阻止了芬太尼产生的张力松弛。通过用10(-6)M纳洛酮阻止阿片类药物受体和通过10(-6)M哌唑嗪和10(-6)M普萘洛尔产生的α和β肾上腺素受体阻断剂,芬太尼剂量反应曲线没有变化。带有10(-6)M阿托品的毒蕈碱阻滞剂和10(-6)M吲哚美辛抑制环氧合酶的作用会减弱对芬太尼的收缩反应。阿片类药物阿芬太尼,舒芬太尼,吗啡和纳洛酮均产生类似于芬太尼的剂量反应,只是幅度有所变化。这些发现表明,麻醉性阿片类药物芬太尼浓度的升高会引起基底犬心外膜冠状动脉环张力的双相变化。这些反应是钙依赖性的,并且可能是其他阿片激动剂和拮抗剂的特征。 [参考:27]

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