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Rebreathing during oxygen treatment with face mask
Author(s) -
Jensen A. G.,
Johnson A.,
Sandstedt S.
Publication year - 1991
Publication title -
acta anaesthesiologica scandinavica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.738
H-Index - 107
eISSN - 1399-6576
pISSN - 0001-5172
DOI - 10.1111/j.1399-6576.1991.tb03291.x
Subject(s) - medicine , anesthesia , ventilation (architecture) , respiratory minute volume , oxygen , respiratory rate , tidal volume , oxygen saturation , heart rate , respiratory system , plethysmograph , blood pressure , chemistry , mechanical engineering , organic chemistry , engineering
The influence of different oxygen flow rates on ventilation and arterial blood gases was investigated in ten healthy volunteers during oxygen treatment with the Hudson® mask. Respiratory parameters were calculated using inductive plethysmography calibrated against pneumotachography. The minute ventilation was greater when using the mask with oxygen flow rates less than 5 1/min compared to when no mask was used. With an oxygen flow rate of 3 1/min, minute ventilation was about 140% of minute ventilation without face mask. With 0 1/min, minute ventilation increased to about 160%. The increase in minute ventilation was mainly due to an increase in tidal volume. No change was seen, however, in Paco 2 with different oxygen flow rates. Secondary objective signs following an increase in respiratory work (changes in heart rate, systolic blood pressure and oxygen saturation) were not seen. We recommend 5 1/min as the lowest oxygen flow rate to be used during oxygen therapy with the Hudson mask, in order to avoid rebreathing and excessive respiratory work.