CPAP Titration Guidelines for Obese Patients with OSA

Initial CPAP Settings

The American Academy of Sleep Medicine recommends starting CPAP at 4 cm H₂O and titrating upward in 1 cm H₂O increments at minimum 5-minute intervals until obstructive events are eliminated 1, 2, 3
The minimum starting CPAP pressure is 4 cm H₂O for all adult patients regardless of obesity status 1, 2, 3
Pressure increments should be at least 1 cm H₂O with at least 5 minutes between adjustments 1
The maximum CPAP pressure is 15 cm H₂O before considering a switch to BiPAP 1, 2

The goal of titration is to eliminate obstructive apneas, hypopneas, respiratory effort-related arousals (RERAs), and snoring 1, 2, 3, 4
If obstructive events persist at CPAP ≥15 cm H₂O, switch to BiPAP 1, 2
BiPAP starting settings include IPAP of 8 cm H₂O, EPAP of 4 cm H₂O, minimum pressure support of 4 cm H₂O, and maximum pressure support of 10 cm H₂O for OSA 1, 2, 4, 5

Screen obese patients with OSA for OHS using serum bicarbonate 4, 6
For stable ambulatory patients with OHS and severe OSA, start with CPAP as first-line therapy rather than BiPAP 7, 4, 6
For OHS patients without severe OSA or with persistent hypoventilation despite CPAP, use BiPAP (noninvasive ventilation) 7, 4, 6

Do not start higher CPAP pressures based on obesity alone, as methodology to determine CPAP a priori based on elevated BMI has insufficient evidence 1
Never use supplemental oxygen alone to treat sleep-related breathing disorders in obese patients, as this may worsen hypercapnia without addressing the underlying ventilatory problem 4
Patient comfort and tolerance are essential for long-term adherence, and pressure should be reduced to a comfortable level if the patient awakens complaining that the pressure is too high 1, 2

All patients should receive adequate PAP education, hands-on demonstration, careful mask fitting, and acclimatization prior to titration 2, 3