Korean J Anesthesiol.  2013 Oct;65(4):337-340. 10.4097/kjae.2013.65.4.337.

Unidirectional valve malfunction by the breakage or malposition of disc: two cases report

Affiliations
  • 1Department of Anesthesiology and Pain Medicine, Wonkwang University College of Medicine, Iksan, Korea.
  • 2Department of Anesthesiology and Pain Medicine, Konkuk University School of Medicine, Chungju, Korea. gooddr21@naver.com
  • 3Department of Anesthesiology and Pain Medicine, Presbyterian Medical Center, Jeonju, Korea.

Abstract

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.

Keyword

Capnography; Hypercapnia; Unidirectional valve

MeSH Terms

Barotrauma
Capnography
Hypercapnia
Respiration
Ventilation
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