摘要
冠脉内注射降钙素基因相关肽(CGRP)0.3μg/kg,对正常及不同程度冠脉狭窄犬的心功能产生不同影响。结果表明,正常犬冠脉内注射CGRP后,平均动脉压(MAP)下降1.2kPa(P<0.05),同时,心率(HR)、心输出量(CO)、左室收缩压峰值(LVSP)均不同程度增加;左室舒张末压(LVEDP)轻度降低。在中度狭窄30min后冠脉内注射CGRP对HR、MAP无明显影响;而重度狭窄后注射CGRP,MAP由狭窄时降低逐渐增高,HR由增快而变慢。CO、LVSP均显著增高,LVEDP降低,此作用较冠脉狭窄前更为明显。提示CGRP能扩张冠状动脉,增加冠脉血流量和心排血量,增强心肌收缩力。
Diferentefectsofintracoronaryinfusionofcalcitoningene-relatedpeptide(CGRP)oncardiacfunctionofnormalandgradedcoronarystenoticdogswereobserved.Theresultsshowedthatthemeanarterypressure(MAP)andtheleftventricularenddias-tolicpressure(LVEDP)decreased(P<0.05),theheartrate(HR),cardiacoutput(CO)andleftventricularsystolicpressure(LVSP)increasedtovaryingdegrees.ButMAPandHRhadnochangeswhenCGRPwasgivenintracoronaryat30minfolowingmiddlecoronarystenosis.After30minseverecoronarystenosis,MAPelevated,HRslowedgradualyandCO,LVSPincreased,butLVEDPdecreased.TheabovementionedresultssuggestedthatCGRPhasprotectiveefectsonischemicmyocardialfunctionthroughincreaseofcoronarybloodflowandpositiveinotropicefect.
关键词
心肌缺血
降钙素基因
相关肽
心脏功能
coronarystenosis
calcitoningene-relatedpeptide
heartfunction