According to the National Association of Medical Direction of Respiratory

According to the National Association of Medical Direction of Respiratory Care Consensus Panel prolonged mechanical ventilation has been defined as

A) "the need for ?30 consecutive days of mechanical ventilation for ?8 hours per day"
B) "the need for ?15 consecutive days of mechanical ventilation for ?12 hours per day"
C) "the need for ?21 consecutive days of mechanical ventilation for ?6 hours per day"
D) "the need for ?40 consecutive days of mechanical ventilation for ?4 hours per day"