Unidirectional valve malfunction by the breakage or malposition of disc - two cases report -.
Malfunction of the unidirectional valve in a breathing circuit system may cause hypercapnia from the rebreathing of expired gas, ventilation failure, and barotrauma. Capnography is a useful method for monitoring the integrity of the unidirectional valve. We experienced two cases of malfunction of a unidirectional valve which caused leakage and reverse flow, diagnosed early as a change of the capnographic waveform. One case was caused by expiratory unidirectional valve breakage. The other was caused by an incorrectly-assembled inspiratory unidirectional valve.
Department of Anesthesiology and Pain Medicine, Wonkwang University College of Medicine, Iksan, Korea.
Chol
C
Lee
Kyu Chang
KC
Lee
Hye Young
HY
Kim
Mi Na
MN
Kim
Eun Kyung
EK
Choi
Ji-Sub
JS
Kim
Won Sang
WS
Lee
Myeong Jong
MJ
Lee
Hyung Tae
HT
Kim
Capnography; Hypercapnia; Unidirectional valve