Carter Bradley G, Fairbank Bronwyn, Tibballs James, Hochmann Mark, Osborne Anthony
Paediatric Intensive Care Unit, Royal Children's Hospital, Parkville, Victoria, Australia.
Pediatr Crit Care Med. 2005 Mar;6(2):125-8. doi: 10.1097/01.PCC.0000154945.05394.A9.
Oxygen-filled self-inflating resuscitators are used by some as a source of oxygen for spontaneously breathing patients. In this application, the bag is not compressed and oxygen is assumed to flow freely from the patient outlet through a mask positioned loosely over the patient's face. We tested 11 resuscitators to determine the delivery of oxygen from the patient outlet using different inlet flows.
Bench test.
A pediatric intensive care unit.
Patient outlet flow was measured at inlet flows of 5, 10, and 15 L/min at two different orientations of the reservoir valve assembly (upright and inverted).
Patient outlet flow varied between resuscitators but was always less than the inlet flow and, in some cases, was as little as approximately 20% of the inlet flow. As the inlet flow rate was increased, the percentage of outlet flow that a patient received decreased, particularly in the upright position. At inlet flows of 5, 10, and 15 L/min, patient outlet flow ranged from 1.1 to 4.6 L/min, 1.6 to 5.1 L/min, and 2.0 to 6.5 L/min, respectively.
Self-inflating resuscitators deliver a significantly lower flow of oxygen than the provided inlet flow and should not be relied on to deliver a precise amount of flow of oxygen to spontaneously breathing patients.
一些人使用充氧自动充气复苏器为自主呼吸的患者提供氧气来源。在这种应用中，气囊不被压缩，并且假定氧气从患者出口通过松散地放置在患者面部的面罩自由流动。我们测试了11台复苏器，以确定在不同进气流量下从患者出口输出的氧气量。
台架试验。
儿科重症监护病房。
在储液阀组件的两种不同方向（直立和倒置）下，分别在进气流量为5、10和15升/分钟时测量患者出口流量。
不同复苏器的患者出口流量各不相同，但始终低于进气流量，在某些情况下，低至进气流量的约20%。随着进气流量的增加，患者获得的出口流量百分比降低，尤其是在直立位置。在进气流量为5、10和15升/分钟时，患者出口流量分别为1.1至4.6升/分钟、1.6至5.1升/分钟和2.0至6.5升/分钟。
自动充气复苏器输出的氧气流量明显低于提供的进气流量，不应依赖其为自主呼吸的患者精确输送一定量的氧气流量。
