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1、离子与药物对离体蟾蜍心脏活动的影响[摘要]目的学习灌流蟾蜍离体心脏方法,观察高钾、高钙、低钙、肾上腺素、乙酰胆碱等因素对心脏活动的的影响。方法制备蟾蜍离体心脏标本,分别灌流CaCl2、KCl、肾上腺素+普奈洛尔及乙酰胆碱,用张力换能器与PCLab生物信号采集处理系统描记心搏曲线并记录心搏变化。结果将插管内的任氏液全部更换为无钙任氏液后,心脏的舒张期张力无明显改变,收缩期张力减小,心率增加;滴加30g/LCaCl2溶液1~2滴后,收缩期、舒张期张力增加,心率显著减小(p<0.05);在任氏液中滴加10g/LKCl溶液1~2滴后,心脏的收缩期张力显著减小(p<0.05),舒张期张力增
2、加,心率非常显著减小(p<0.01);在任氏液中滴加0.1g/L肾上腺素溶液1~2滴后,心脏的收缩期张力增加,舒张期张力、心率基本不变;在任氏液中滴加0.1g/L肾上腺素溶液1~2滴后,心脏的舒张期张力基本不变,收缩期张力显著增加,心率轻度增加;待心搏曲线稳定后,向灌流液中加10g/L普奈洛尔溶液1~2滴,可见心脏的舒张期张力基本不变,收缩期张力略有减小,心率基本不变。待心搏曲线稳定后,再向灌流液中加0.1g/L肾上腺素溶液1~2滴,心搏曲线无明显变化;在任氏液中加10-2g/L乙酰胆碱溶液1~2滴后,心脏的舒张期张力增加,收缩期张力显著减小(p<0.05),心率则有非常显著减小
3、(p<0.01)。结论心肌细胞外高Ca2+时心肌收缩性增强;高钾使心肌收缩性减弱;肾上腺素使心输出量增加,心肌收缩性增强,而普奈洛尔可不可逆转性的抑制肾上腺素的作用;乙酰胆碱可使心肌收缩性降低。[关键字]蟾蜍离体心脏灌流肾上腺素乙酰胆碱[Abstract]Objectivestudyfillsflowsthetoadtothebodyheartmethod,observesK,factorandsoonCa,lowcalcium,adrenalin,acetylcholintothecardiacactivityinfluence.Methodspreparationtoadle
4、avesthebodyheartspecimen,FillsseparatelyflowsCaCl2,KCl,theadrenalin+propranololandtheacetylcholin,WrestlesthecurveandtherecordheartwiththetensitytransducerandthePCLabbiologysignalgatheringprocessingsystemdescriptionheartwrestlesthechange.Resultsitwillinsertatubenomatterwhatthefluidreplacescom
5、pletelyafterdoesnothavethecalciumnomatterwhatthefluid,theheartdiastoletimetensitydoesnothavetheobviouschange,thecontractiontimetensityreduces,heartrateincrease;Addsbydrops30g/AfterLtheCaCl2solution1~2drops,thecontractiontime,thediastoletimetensityincreases,theheartrateremarkablyreduces(p<0.05
6、);Innomatterwhatthefluidaddsbydrops10g/AfterLtheKClsolution1~2drops,theheartcontractiontimetensityremarkablyreduces(p<0.05),thediastoletimetensityincreases,theheartrateextremelyremarkablyreduces(p<0.01);Innomatterwhatthefluidaddsbydrops0.1g/AftertheLadrenalinsolution1~2drops,theheartcontracti
7、ontimetensityincreases,thediastoletimetensity,theheartratebasicareinvariable;Innomatterwhatthefluidaddsbydrops0.1g/AftertheLadrenalinsolution1~2drops,theheartdiastoletimetensitybasicisinvariable,contractiontimetensityremarkableincrease,heartr