The victim was bound upon this wheel, on his knees, with his hands behind his back.
A continuous positive airway pressure (CPAP) machine was initially used mainly by patients for the treatment of sleep apnea at home, but now is in widespread use across intensive care units as a form of ventilation.
The VPAP machines and the CPAP machines have other differences as well. The main illness that CPAP machines treat and manage is obstructive sleep apnea. The VPAP machines are generally prescribed for congestive heart failure, sleep apnea, respiratory illnesses and more.