Document Detail

Humidification during anesthesia.
MedLine Citation:
PMID:  9648187     Owner:  NLM     Status:  MEDLINE    
Humidification during anesthesia is important to prevent adverse changes in the upper airways and possible pulmonary compromise. These changes may take place in less than 1 hour using dry nonhumidified anesthetic gases. Consequently, some method of humidification should be employed for all but the shortest of surgical procedures requiring general anesthesia. Methods of humidification include the anesthesia breathing system itself, passive humidification or conservation of moisture (the use of HMEs), and active humidification. The simplest system providing good levels of humidification and warming of anesthetic gases is the Circle system, which uses a fresh gas flow of less than 2 L/min. Its success can be further enhanced by use of a coaxial circuit. The minimum levels of water output or humidity required in the breathing circuit remain controversial. It may be preferable to have a gas with a lower temperature and higher relative humidity because a warmer gas that is less saturated may result in increased desiccation from the upper airways. Humidification for neonatal and pediatric patients requires special consideration of resistance, work of breathing, and dead space. Further work is necessary with regard to the use of HMEs in this population of patients undergoing general anesthesia.
K D Carson
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Publication Detail:
Type:  Journal Article; Review    
Journal Detail:
Title:  Respiratory care clinics of North America     Volume:  4     ISSN:  1078-5337     ISO Abbreviation:  Respir Care Clin N Am     Publication Date:  1998 Jun 
Date Detail:
Created Date:  1998-09-08     Completed Date:  1998-09-08     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  9612026     Medline TA:  Respir Care Clin N Am     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  281-99     Citation Subset:  IM    
Department of Anesthesia, Mater Misericordiae Hospital, Dublin, Ireland.
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MeSH Terms
Anesthesia, General / methods*
Child, Preschool
Infant, Newborn
Intubation, Intratracheal
Pulmonary Gas Exchange
Respiration, Artificial / instrumentation,  methods*
Respiratory Mechanics*

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