Consequences of Pausing Heated Humidification During Invasive Ventilation.
BACKGROUND: During invasive mechanical ventilation, where medical gases are very dry and the upper airway is bypassed, appropriate gas conditioning and humidification are mandatory at all times. Results of in vitro studies suggest that dry gases may improve lung deposition during nebulization, but t...
| Publicado en: | Respiratory Care Vol. 69; no. 10; pp. 1239 - 1245 |
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| Autores principales: | , |
| Formato: | research tables/charts Journal Article |
| Publicado: |
Mary Ann Liebert, Inc.
Oct2024
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=180048431&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 180048431 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 00201324 4GG jtl: Respiratory Care issn: 00201324 maglogo: N pubinfo: dt: Oct2024 vid: 69 iid: 10 pid: 1365 pub: Mary Ann Liebert, Inc. place: New Rochelle, New York artinfo: ui: 180048431 180048431 180048431 10.4187/respcare.12084 180048431 ppf: 1239 ppct: 6 formats: fmt: @attributes: type: P tig: atl: Consequences of Pausing Heated Humidification During Invasive Ventilation. aug: au: Lellouche, François Bouchard, Pierre-Alexandre affil: Centre de Recherche de l'Institut Universitaire de Cardiologie et de Pneumologie de Québec, Université Laval, Québec, Québec, Canada sug: subj: Respiration, Artificial Methods Heat Nebulizers and Vaporizers Humidity Gases Ventilators, Mechanical Human Male Female Air Conditioning Product Evaluation Equipment Design Funding Source Male Female ab: BACKGROUND: During invasive mechanical ventilation, where medical gases are very dry and the upper airway is bypassed, appropriate gas conditioning and humidification are mandatory at all times. Results of in vitro studies suggest that dry gases may improve lung deposition during nebulization, but this has not been confirmed through in vivo studies. The objective of this study was to measure gas humidity under multiple conditions to better describe gas hygrometry when heated humidifiers are turned off. METHODS: We measured, on a bench, the hygrometry of different gases at steady state: medical gases, at the Y-piece without humidifier, with the humidifier switched off, and with humidifier switched on. We measured gas humidity every 10-60 s during dynamic conditions after switching off the heated humidifier and after switching on the heated humidifier. Hygrometry was measured by using the psychrometric method with at least 3 measurements for each tested condition. RESULTS: We performed 287 psychrometric measurements in different situations. The mean ± SD gas absolute humidity at steady state during different conditions were the following: 1.6 ± 0.2 mg H2O/L for the medical gases, 4.5 ± 0.9 mg H2O/L at the Y-piece without humidifier, 9.1 ± 0.3 mg H2O/L at the Y-piece with heated humidifier turned off, and 34.2 ± 2.2 mg H2O/L at the Y-piece with the heated humidifier turned on. During the dynamic evaluation, after turning off the humidifier, humidity was < 30 mg H2O/L after a few minutes, attained 15 mg H2O/L after 15 min, and was below 10 mg H2O/L after 1 h but never reached the level of dry medical gases. After turning on the heated humidifier, the gas hygrometry reached 30 mg H2O/L after 5 min. CONCLUSIONS: When heated humidifiers are turned off, gas humidity levels are very low but not as low as medical gases. The clinical impact of repeated shutdowns is unknown. As recommended, heated humidifiers should never be turned off during nebulization. pubtype: Academic Journal doctype: research tables/charts Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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