Effects on pulmonary function of daily exposure to dry or humidified hyperbaric oxygen

A. Shupak, A. Abramovich, Y. Adir, I. Goldenberg, Y. Ramon, P. Halpern, A. Ariel

Research output: Contribution to journalArticlepeer-review


The purpose of this study was to examine the effects of breathing dry or humidified hyperbaric oxygen on pulmonary function. Pulmonary function tests were performed before and after each of 10 hyperbaric oxygen exposures at 2.5 atmospheres absolute (ATA) for 95 min in a group of 13 patients treated daily by hyperbaric oxygen for problem wounds. Patients breathed dry oxygen during five successive sessions and humidified oxygen during the remaining five. No differences were found between forced vital capacities (FVC) and maximal expiratory flows before and after hyperbaric oxygen exposure while breathing dry or humidified oxygen. Significant differences were found for the changes in the percentage of FVC expired in 1 s (EEV(1%)) and mean forced mid- expiratory flow rate during the middle half of the FVC (FEF25 (75%)) on day 1 alone: decrements of 1.42 and 2.96%, respectively, under dry oxygen, vs. increments of 3.93 and 34.4%, respectively, for humidified oxygen. Day-to- day decrements in the percent changes in FEV(1%) and FEF25 (75%) were observed while breathing humidified hyperbaric oxygen. These results demonstrate that repeated daily exposure to humidified hyperbaric oxygen abolishes the initial beneficial effect of humidification on peripheral airways flow characteristics.

Original languageEnglish
Pages (from-to)241-246
Number of pages6
JournalRespiration Physiology
Issue number3
StatePublished - Jun 1997
Externally publishedYes


  • Dry vs. humidified hyperbaric oxygen
  • Function test
  • Humidification
  • Hyperbaric oxygen
  • Lung

ASJC Scopus subject areas

  • Physiology
  • Pulmonary and Respiratory Medicine


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