心阻抗技术在心脏外科监护中应用价值的研究

THE USE OF IMPEDANCE CARDIOGRAPHY FOR PATIENT MONITORING IN CARDIAC SURGERY

心阻抗图是目前正在发展的非侵入性心血管功能监测技术之一。本研究报告58例心脏直视手术病例,术前和术后应用心阻抗图进行了心血管功能监测。结果发现,所监测心脏指数(CI)的结果和变化规律同其他作者用染料法测定者基本一致。射血速度指数(EVI)>1.0Ω/s时,表示心脏功能正常,EVI<0.8Ω/s时,说明心脏功能低下,EVI用于判断心肌功能较为敏感和可靠。胸液指数(TFI)<1.9Ω时常伴有动脉血气异常。研究证明,心阻抗技术对于心脏外科病人术后监护具有较大的参考价值,并且具有连续、非侵入性和实时监测的特点。

Impedance cardiography,being developed recently,is a noninvasive cardiovascular monitoring technique.In this study,fifty-eight patients undergoing open-heart operations were monitored pre-and posto-peratively by impedance cardiography.It was shown that the results were comparable with the results of other authors using indicator-dilution curves.EVI greater than 1.0Ω/s indicated normal cardiac fun-ction while EVI less than 0.8Ω/s indicated markedly subnormal cardiac function.The results indicated that EVI was a sensitive and reliable parameter to estimate myocardial function.TEI less than 1.9Ω was usually associated with abnormal arterial blood gas analysis,so TFI was useful to assess postoper- ative respiration insufficiency.It was concluded that impedance cardiography was helpful and dependable-in early postoperative patient care in cardiac surgery and it had the advantage of continuous,noniuva-sive,real-time monitoring.