CPAP delivers one constant pressure, while BiPAP delivers two: IPAP (inhalation) and EPAP (exhalation). CPAP is the first-line treatment for obstructive sleep apnea and works well for most patients. BiPAP is prescribed when: CPAP therapy fails or is uncomfortable, higher pressures are needed, you have central or complex sleep apnea, you have COPD or other respiratory conditions, or you have difficulty exhaling against CPAP pressure. BiPAP machines cost more than CPAP but offer greater flexibility. Your doctor will prescribe the appropriate therapy based on your specific needs.
CPAP uses one pressure; BiPAP uses two for easier breathing, prescribed for complex conditions or CPAP intolerance.