Effects of the reservoir bag disconnection on inspired gases during general anesthesia: a simulator-based study

BMC Anesthesiology

Table 3 Time constants for inspired concentrations od oxygen, sevoflurane and nitrous oxide, during reservoir bag disconnection at variable rates of fresh gas flows (FGF) and different carrier gases

FGF (L/min)	Time constant (minutes) Oxgen and air as the carrier gas		Time constant (minutes) Oxgen and nitrous oxide as the carrier gas
FGF (L/min)	F_IO₂	F_ISevo	F_IO₂	F_ISevo	F_IN₂O
0.5	2.5 [2.5–2.5]	2.0 [1.8–2.25]	1.0 [1.0–1.0]	3.0 [2.3–3.0]	1.5 [1.5–1.8]
1.0	2.5 [2.5–2.8]	2.0 [1.8–2.0]	1.0 [1.0–1.3]	2.0 [1.8–2.0]	1.5 [1.3–1.5]
2.0	1.5 [1.5–1.5]	1.5 [1.5–1.8]	1.0 [1.0–1.0]	1.0 [1.0–1.5]	1.0 [1.0–1.0]

Values of the time constant are expressed as median [25th–75th percentile]
FGF fresh gas flow, F_IN₂O inspired nitrous oxide concentration, F_IO₂ inspired O₂ concentration, F_ISevo inspired sevoflurane concentration

ISSN: 1471-2253