Jonsson L O, Zetterström H
Acta Anaesthesiol Scand. 1987 Feb;31(2):174-8. doi: 10.1111/j.1399-6576.1987.tb02544.x.
In a lung model the rebreathing effects of different respiratory flow patterns (RFP) were studied in the coaxial Mapleson A (Lack) and D (Bain, Coax-II) systems during spontaneous breathing. In the Mapleson A system RFP was not found to have any impact. In the D systems FACO2 was higher with an RFP typical of halothane-anaesthetized patients than with an RFP with an exponentially decreasing expiratory flow and an end-expiratory flow pause (FTEP). The difference in FACO2 was 26% with a VF corresponding to 100 ml X min-1 X kg-1 body weight. The RFP in a non-anaesthetized volunteer was intermediate between these two patterns. Rebreathing decreased in the D systems with prolongation of FTEP and when a decelerating expiratory flow was used.
在一个肺模型中，研究了在自主呼吸期间同轴Mapleson A（Lack）和D（Bain、Coax-II）系统中不同呼吸流型（RFP）的重复呼吸效应。在Mapleson A系统中，未发现RFP有任何影响。在D系统中，与具有指数递减呼气流量和呼气末流量暂停（FTEP）的RFP相比，氟烷麻醉患者典型的RFP导致的终末潮气二氧化碳分数（FACO2）更高。当分钟通气量（VF）相当于100 ml·min⁻¹·kg⁻¹体重时，FACO2的差异为26%。一名未麻醉志愿者的RFP介于这两种模式之间。在D系统中，随着FTEP的延长以及使用减速呼气流量时，重复呼吸减少。
