Roland Kaddoum, Chadi I Yaacoub, George M McKelvey, Hong Wang
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引用次数: 0
Abstract
Study Objective: To study the effects of circuit leak development over time and response during volume and pressure controlled ventilation using low flow in human patient simulator and to examine the minimum fresh gas flow needed to compensate for such a leak.
Design/Setting: Prospective study using a patient Simulation Lab at Wayne State University.
Measurements: A human patient simulator was endotracheally intubated. The endotracheal
tube (ETT) was connected to the Datex-Ohmeda AS/3 Anesthesia machine. The tidal volume was
set to 500ml in the volume controlled trial and the pressure to 6cm H2O in the pressure controlled
trial. A hole was created in each experiment placed 10 cm after the inspiratory valve. Leaks were
simulated from holes using 4 different needle diameters: 25, 21, 18 and 16G. A series of data were
collected using fresh gas flow at 4 different flow rates (0.5, 1, 1.5 and 2 liters.min-1). Data was
measured at different time points (baseline, 1, 3 and 5 minutes) in the series of simulated leaking
breathing circuits.
Results: Leak alarms were only detected with 16G hole at 5 minutes in the volume control
mode versus leaks at 3 minutes with 16G hole and at 5 minutes with 18G hole in the pressure
control mode.
Conclusion: When a very low flow of 0.5 L/min is used, volume control is safer than pressure control modes.
期刊介绍：
The journal is published three times a year (February, June, and October) and has an Editorial Executive Committee from the department and consultant editors from various Arab countries. A volume consists of six issues. Presently, it is in its 42nd year of publication and is currently in its 19th volume. It has a worldwide circulation and effective March 2008, the MEJA has become an electronic journal. The main objective of the journal is to act as a forum for publication, education, and exchange of opinions, and to promote research and publications of the Middle Eastern heritage of medicine and anesthesia.
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