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Korean Journal of Anesthesiology 1999;36(3):519-523.
DOI: https://doi.org/10.4097/kjae.1999.36.3.519   
Expiratory Unidirectional Valve Malfunction Detected by Capnographic Waveform Change: A case report.
Woon Seok Roh, Hoon Min Park, Bong Il Kim, Soung Kyung Cho, Sang Hwa Lee
Department of Anesthesiology, School of Medicine, Catholic University of Taegu Hyosung, Taegu, Korea.
Unidirectional valve (UDV) malfunction causes rebreathing of expired gas during anesthesia. However, the resultant hypercarbia without hypoxemia by UDV malfunction is not easily detected. We experienced a case of severe hypercarbia which caused by sticking expiratory valve at 45 minutes after the induction of anesthesia, in spite of checking UDV function preoperatively. In this case, expiratory UDV malfunction was diagnosed with the change of capnographic waveform. And so, we recommend monitoring of capnographic waveform during every anesthesia, in addition to preoperative UDV checking.
Key Words: Complications, equipment failure; Equipment, unidirectional valve


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