BiPAP stands for bilevel positive airway pressure. Unlike CPAP that uses a single continuous pressure, BiPAP uses two different pressures, one for inhalation (IPAP), and one for exhalation (EPAP). A BiPAP ventilator also referred to a BPAP ventilator, can be used to sense a significant shift in the patients breathing and compensate for this by adjusting pressures to maintain a steady breathing pattern. Sometimes patients cannot tolerate the continuous pressure delivered in a CPAP. Either the pressure is too high for them to adjust, or they struggle to exhale against the incoming pressure. BiPAP allows for a lighter EPAP pressure to make it easier to exhale.