COPD is an umbrella term for lung and also breathing conditions that make breathing hard. BiPAP devices have 2 pressure setups-- inhalation positive respiratory tract stress as well as exhalation positive air passage pressure-- that permit reduced pressure degrees throughout exhalation. Relying on the BiPAP maker's setups, the switch in between IPAP and also EPAP might be timed or immediately based upon the user's breathing patterns. BiPAP equipments have a common stress series of 4 to 30 cm H2O. explanation