CO2 rebreathing of T-piece system in patients during recovery phase from acute respiratory failure

Journal of Anesthesia
H ToyookaH Takahashi

Abstract

Eight respiratory parameters which might affect the amount of carbon dioxide rebreathing were assessed in seven patients who were breathing spontaneously from large-bore T tube system during the recovery phase from acute respiratory failure. With multivariate regression analysis, the absolute amount of rebreathed CO2 at the connector of endotracheal tube (VINSPCO2) were approximately estimated by using relatively small number of parameters, including minute volume (VEXP), fresh gas inflow to T piece system (VFGI) and preferably by additional parameters concerning CO2 output of the patients.CO2 rebreathing ratio, VINSPCO2 divided by gross outward flux of CO2 at the connector (VEXPCO2), was predicted with simple regression equation by using (VEXP/VFGI) as follows,(VINSPCO2)/(VEXPCO2) = 0.405 + 0.33 x ln (VEXP/VFGI)The maximum (VEXP/VFGI) ratio to prevent rebreathing of CO2 at the connector was 0.30, whereas the ratio to prevent CO2 accumulation due to rebreathing was 0.45.

References

Sep 1, 1973·Canadian Anaesthetists' Society Journal·J A Bain, W E Spoerel
Dec 24, 1970·The New England Journal of Medicine·A KumarH Pontoppidan
Nov 1, 1970·The Australian and New Zealand Journal of Surgery·D Muir
Sep 1, 1954·British Journal of Anaesthesia·W W MAPLESON
Apr 1, 1964·British Journal of Anaesthesia·G A HARRISON

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