Gravenstein N, Lampotang S, Beneken J E
J Clin Monit. 1985 Jan;1(1):6-10. doi: 10.1007/BF02832683.
The Bain circuit provides continuous fresh gas flow near the airway. The potential mixing of this fresh gas with expired gas may prevent reliable analysis of expired gas. We therefore investigated the interaction of sampling site, fresh gas flow rate, expiratory flow rate, and sampling flow rate on expiratory capnography. Sampling near the fresh gas outlet yielded inaccurate results under several of these conditions. The magnitude of the error was related to the fresh gas and expiratory flow rates. A reliable sampling region near the endotracheal tube was identified.
贝恩回路在气道附近提供持续的新鲜气体流。这种新鲜气体与呼出气体的潜在混合可能会妨碍对呼出气体进行可靠的分析。因此，我们研究了采样部位、新鲜气体流速、呼气流量和采样流速对呼气末二氧化碳监测的相互作用。在其中几种情况下，在新鲜气体出口附近采样会得出不准确的结果。误差的大小与新鲜气体和呼气流量有关。确定了气管导管附近的一个可靠采样区域。
