Geddes L A, Babbs C F
Crit Care Med. 1980 Mar;8(3):131-3. doi: 10.1097/00003246-198003000-00007.
The authors have developed a method for measurement of cardiac output during CPR with ventricular fibrillation. The method avoids the problems encountered when conventional techniques are used under the conditions of very low cardiac output. The method consists of injecting 5% saline as the indicator into the left ventricular and detecting its appearance in the descending aorta by withdrawing aortic blood through an electrically calibrated conductivity cell. The adequacy of indicator mixing has been verified by obtaining dilutions curves simultaneously from the brachial and femoral arteries. Cardiac output can be determined even when output is as low as 7 ml/min . kg during CPR with ventricular fibrillation. Repeated determinations can be made as often as every min. This method offers promise as a practical research tool which can also be used with dye indicators.
作者们研发出一种在心室颤动时进行心肺复苏过程中心输出量测量的方法。该方法避免了在极低心输出量条件下使用传统技术时所遇到的问题。此方法包括将5%的盐水作为指示剂注入左心室，并通过一个经电校准的传导性细胞抽取主动脉血来检测其在降主动脉中的出现情况。通过同时从肱动脉和股动脉获取稀释曲线，已验证了指示剂混合的充分性。即使在心室颤动的心肺复苏过程中心输出量低至7毫升/分钟·千克时，也能测定心输出量。每隔一分钟就可以重复进行测定。这种方法有望成为一种实用的研究工具，也可与染料指示剂一起使用。
