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AF-HF001对正常大鼠离体心脏的正性肌力及心电作用

AF-HF001-induced positive inotropic and electrocardiac effect in normal isolated rat hearts

  • 摘要: 采用正常大鼠离体心脏模型,利用Langendorff离体灌流装置考察各浓度AF-HF001对大鼠离体心脏左心室收缩压(LVSP)、左心室舒张末期压(LVEDP)、左心室内压最大上升速率(+dp/dtmax)以及左心室内压最大下降速率(-dp/dtmax)的影响。结果表明:AF-HF001能够剂量依赖性地增强大鼠离体心脏LVSP、LVEDP及左心室最大变化速率,表明AF-HF001可对正常大鼠离体心脏产生正性肌力作用。同时结合分布于心尖、右心室游离壁、主动脉根部的检测电极检测AF-HF001的心电作用,结果显示AF-HF001在各灌流浓度下PR,QRS,QTc及心率等各项心电指标未改变,表明AF-HF001在保证增强心肌收缩力及产生更大心脏搏出量的同时也具备良好的安全性。本研究为AF-HF001的深入开发奠定了良好的基础。

     

    Abstract: In this study, normal isolated rat heart model was adopted to investigate the inotropic and electrocardiac effect of AF-HF001 with Lanfendorff technique on the left ventricular systolic pressure(LVSP), left ventricular end diastolic pressure(LVEDP), peak rate of rise of left ventricular pressure(+dp/dtmax)and peak rate of fall of left ventricular pressure(-dp/dtmax). The results indicated that AF-HF001 could significantly enhance LVSP, LVEDP and ±dp/dtmax in a dose-dependent manner and exerted a positive inotropic effect on normal isolated rat hearts. This study also analyzed the electrocardiac effect of AF-HF001 with the electrodes located on tip of heart, ventricular free wall and aortic root. The results exhibited that AF-HF001 did not change PR, QRS, QT or HR at various concentrations, which means that AF-HF001 could safely increase cardiac contractility. This research lays a good foundation for the further study on AF-HF001 and research on structure-activity relationship of its analogs.

     

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