The following circuit factors need should be used for the four anaesthesia OSCEs:
Mini Lack Circuit: 1
Parallel Lack Circuit: 1 – 1.5
Bain Circuit: 2.5 – 3
T-Piece Circuit: 2.5 – 3
The correct methodology for working out the Fresh Gas Flow is:
Tidal Volume (TV) = mls x kgs
i.e. 15mls x 5kgs = 75mls
Minute Volume (MV) = TV x Respiration Rate
i.e. 75mls x 30 RR = 2,250mls/min
Fresh Gas Flow (FGF) = MV x Circuit Factor (this will depend on the circuit, see above)
The final answer must include both units and time (either litres per min or millimetres per min are acceptable)
i.e. 2,250mls/min or 2.25Litres/Min
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