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Korean J Anesthesiol > Volume 57(4); 2009 > Article
Korean Journal of Anesthesiology 2009;57(4):493-498.
DOI: https://doi.org/10.4097/kjae.2009.57.4.493   
Broken inspiratory valve detected by capnographic waveforms during general anesthesia: A case report.
Mi Young Kim, Eun Joo Kim, Ji Hyang Lee, Sang Kon Lee, Jong Suk Ban, Byung Woo Min
Department of Anesthesiology and Pain Medicine, Daegu Fatima Hospital, Daegu, Korea. kej1127@fatima.or.kr
Unidirectional valve malfunction causes re-breathing of expired gas during anesthesia. Capnography is a useful method for monitoring the integrity of anesthetic equipment such as the unidirectional valves in a circular system. We report, here a case in which the capnography did not sound any rebreathing alarm, but the capnogram showed a prolonged plateau, an apparently short inspiratory period and a gradually sloping descending limb that stopped just short of baseline. As a result, capnography helped to identify an inspiratory unidirectional valve malfunction during the course of anesthesia. This study emphasizes the need to analyze the capnogram during every procedure involving anesthesia, in addition to preoperative checking of the Unidirectional valve.
Key Words: Capnogram; Inspiratory valve malfunction; Rebreathing
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