经左心温度稀释法测定心排血量新型导管的应用研究

APPLICATION OF A NEW CATHETER TO BE DETERMINING CARDIAC OUTPUT THROUGH COR SINISTRUM WITH THERMODILUTION

目的:介绍一种新型经左心使用温度稀释法测量心排血量(CO)的导管和方法。方法:健康杂种犬8只,采用自身对照,经右心使用肺动脉气囊漂浮导管,经动脉使用自制的左心测定管,其放置部位分两种情况:前端在左心室内和在主动脉根部。在控制呼吸、停呼吸、控制性降压中、控制性降压后5min四种情况下同时测量心排血量。结果:肺动脉导管与左心导管在两种不同部位情况下测得CO呈正相关,γ分别为0.986和0.989,心脏指数(CI)也呈正相关,γ分别为0.983和0.985;左心导管在两种不同部位情况下所测CO之间与CI之间也显著相关,γ分别为0.992、0.988。结论:制作的左心测定管所测心排血量与肺动脉气囊漂浮导管所测值之间有良好相关性,且设计简单,操作方便。

Aim： To introduce a new device and catheter to be determining cardiac output through cor sinistrum with thermodilution. Methods： Own control was introduced in eight dogs. A pulmonary thermodilution catheter was used through the cor dextrum of the dogs; The new-design catheter was used through artery, and there were two situs to fix： its ahead in left artrium and the ahead near to aortic root. Determine cardiac output （CO） under four circumstances： controlled respiration, apnoea, in controlled hypotension, after controlled hypotension. Results： There was no significant difference among the parameters（CO and cardiac index） of all circumstances. The CO determined by the pulmonary thermodilution catheter and those by the new-design catheter in two situs were positive correlation, and the 7 were 0. 986,0. 989; likewise, the cardiac index （CI） was positive correlation, and the 7 were 0. 983,0. 985. The CO and CI by the new-design catheter between two situs were positive, and the 7 were 0. 992,0. 988. Conclusion： The parameters by the new-design catheter and those by the pulmonary thermodilution catheter were concordant. In comparison with the pulmonary thermodilution catheter, the new-design catheter had simple device and could be easily operated.