The paraPAC is a powerful and compact gas powered ventilator which meets JAMA guidelines for adult, child, and infant ventilation during CPR. The frequency control varies the breathing rate from 8 to 40 per minute and is color coded with the tidal volume control which gives volumes from 1300 ml to 70 ml. The paraPAC is equipped with a two-point blender of 100% O2 or an air mix of 50% O2. It also has adjustable relief pressure of 20 to 80 cmH2O with optional audible alarm. If the patient makes any spontaneous breathing effort, oxygen is automatically taken from the integral demand valve. If this breathing is inadequate for the patient, then the ventilator still delivers minimum ventilation but delays each breath appropriately to synchronize with the patientís breathing effort. If the patient breaths adequately, then the ventilator becomes inhibited and oxygen is supplied by the demand valve only.