True about mapleson D circuit is: (A) FGF for spontaneous ventilation is equal to minute ventilation, (B) Expiratory valve is closer to patient, (C) 1.8 times the minute ventilation is required gas flow for controlled ventilation., (D) Preferred circuit for spontaneous ventilation.
Answer is C. Expiratory valve is away from the patient end in mapleson D circuit. 3 times minute ventilation is required for spontaneous ventilation.
Mapleson A is the preferred circuit for spontaneous ventilation.