【摘要】 本文目的在于深入研究降钙素基因相关肽 (CGRP)对豚鼠冠状血流量以及心脏传导系统各部分的作用。采用Langendorff法灌流心脏 ,同步记录心脏表面电图和希氏束电活动。观察应用CGRP前后的冠脉流量、自主心率、在相同心房周期下的房室结 (AH)及希浦系传导时间 (HV)、心脏出现 3∶2文氏传导及 2∶1房室传导阻滞所需的最长起搏周期 (PCL3∶2 ,PCL2∶1)。CGRP (3～ 30nmol/L)可显著增加冠脉流量 ;CGRP (30nmol/L)仅使自主心率轻度增加 ;CGRP (3～ 30nmol/L)对AH和HV未产生明显影响 ,也不影响PCL3∶2和PCL2∶1。结果表明 ,在本实验条件下 ,CGRP对豚鼠心脏的作用点主要位于冠脉血管 ,其次是窦房结 ,而对房室传导系统没有作用。更多还原

【Abstract】 The purpose of this study was to examine the effects of calcitonin gene related peptide (CGRP) on coronary flow and various parts of cardiac conduction system (CCS) in the isolated guinea pig heart by recording the cardiac electrogram and His bundle activity simultaneously. The coronary flow (CF) was measured and the right atrium was paced at incremental frequencies periodically. Perfusing heart with CGRP at the concentrations of 3～30 nmol/L increased CF strikingly and dose dependently. CGRP (30 nmol/L) caused a moderate and significant increase in the spontaneous heart rate, but failed to influence the atrioventricular nodal and His bundle Purkinje fiber conduction time and the longest atrial pacing cycle length inducing 3∶2 Wenckebach and 2∶1 AV nodal conduction. The results indicate that CGRP in the guinea pig heart might act mainly on coronary vessels and then the sinus node, but did not affect the conductivity and refractoriness of the AV conduction system.更多还原