ArticleIndian journal of anaesthesia2025
Feasibility, safety and efficiency of an over-pressure wash-in method using fresh gas flow 0.5 L and sevoflurane 8% during initiation of low-flow anaesthesia: A randomised, descriptional study.
Article in Indian journal of anaesthesia, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Background and Aims: Low-flow anaesthesia (LFA) typically involves a high fresh gas flow (FGF) of 4-6 L/min during the wash-in phase. We aimed to assess the feasibility, safety, and efficiency of an over-pressure wash-in method (FGF = 0.5 L and sevoflurane = 8%) of LFA. The primary objective was the time required to achieve a fraction of alveolar sevoflurane (FAS) =2% (target). Secondary objectives included breathing system stability, ephedrine use, and gas consumption. Methods: After obtaining ethical clearance and consent, 48 patients aged 18-65 years were randomised to two groups: 'conventional' (Group C) and 'over-pressure' (Group OP). During the wash-in phase, FGF was set at 6 L/min with a sevoflurane vaporiser dial (FVS) of 3% in Group C and at 0.5 L/min with an FVS of 8% in Group OP. After achieving a FAS of 2%, FGF was reduced to 0.5 L/min in Group C, and FVS was adjusted to 4% in both groups, which were maintained for 15 min. The unpaired Results: Data from 45 patients (23 in Group C and 22 in Group OP) were analysed. The mean T Conclusion: Our method of over-pressure wash-in during LFA initiation is simple, feasible, safe, efficient, economical, and environmentally friendly.
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