Evaluating Tidal Volume Delivered by a Self-Inflating Bag Depending on the Compression Method

Woo Jin Cho ； Hyun Jung Kim ； Tae Ki Yang ； Kibum Sim

《Asian Journal of Anesthesiology》 58卷3期 (2020/09) Pp. 94-98

https://doi.org/10.6859/aja.202009_58(3).0002

摘要

Background: A self-inflating bag (SIB) is an essential device for pulmonary resuscitation in emergencies. However, it is difficult for a rescuer to accurately predict a tidal volume (TV) delivered by a SIB to a patient. Objective: The objective of this study was to evaluate TV values delivered by a SIB with various compression methods. Methods: A total of 33 participants were enrolled in this study. Anterior, middle, and posterior points were marked on the surface of the SIB to guide participants to place their fingers. This was connected to a gas-flow analyzer and a test lung to measure the TV. Participants were asked to squeeze the SIB with one-handed and two-handed compression at anterior, middle, and posterior points. Results: The TV was the largest when the bag was squeezed with two-handed compression at the middle points (578 ± 21 mL). It was the smallest when the bag was squeezed with one-handed compression at the anterior point (311 ± 15 mL). Except that the TV with one-handed compression at the middle point and the TV with two-handed compression at the posterior points were similar, all other TV values were significantly different from each other (all P ＜ 0.001). Conclusion: The TV delivered by a SIB could differ greatly depending on the compression points and whether one or two hands are used. Therefore, a rescuer should choose an appropriate compression method considering patient's physical characteristics and medical conditions.

關鍵字

equipment design ； resuscitation ； tidal volume