The Construction and Study of Pressure and Volumeof Srinagarind Hospital Non-Rebreathing Bag and Conventional Non-Rebreathing Bag in Simulator

Abstract

Background and Objective: Nowadays, one of the important resuscitation equipment is non-rebreathing bag orself –inflating bag. ‘One way valve technique’ has been used in all type of the non-rebreathing bag. Thus, the objective of this study was to invent theSrinagarind hospital non-rebreathing bag(SRI bag), by using common materials, to reduce cost and to do it yourself.

Method: TheSRI bag was made of 1.45 litres plastic bottle(PEPSI®), 5 ml, 10 ml, 20 ml disposable syringes, endotracheal tube and disposable medical gloves. After SRI bag was done, weconnect it with lung simulator (LS800 lung simulator Dräger Medical AG & Co. KG, Lübeck, Germany). The test was done by squeezingthe bag 20 times regularly (average 10 time/min) with SRI bag and conventional non-rebreathing bag (1 liter and 2 liters). Pressure and volume were recorded via pressure gauge and spirometer. After that, the pressure was fixed at 10 mmHg and the volume was recorded in allnon-rebreathing bags.

Result: The mean pressure of SRI bag whencomparing with 1 liter and 2 liters conventional non-rebreathing bag are9.35 ± 1.31, 17.1 ± 1.55, 15.73 ± 2.87 mmHg, respectively. The mean volumes are 86 ± 16.98, 213 ± 8.13, 359.15 ± 26.07 millilitres, respectively. Atset pressure of 10 mmHg, the mean volumes are 65.5±7.59, 120.5±10.5, 199.5 ±50.2milliliters, respectively. From this result, the pressure and volume of SRI bag was less than both conventional non-rebreathingbag which can be explained that the SRI bag had less compliance and flexibility than conventional non-rebreathingbag.

Conclusion: Srinagarind hospital non-rebreathing bag can be constructed by yourself with low cost and from common materials. However, the SRI bag had less compliance and flexibility than conventional non-rebreathing bag. For the safety reason, itmay be suitableto use only in an emergency situation.