Can breakthrough apneas persist during BiPAP when pressure, leak, or nightly use are inadequate?

Breakthrough apneas on BiPAP commonly reflect incomplete control of sleep-disordered breathing rather than treatment failure per se. The claim is supported by bilevel-specific titration guidance and complementary PAP observational evidence.

Clinical evidence

• AASM bilevel titration guidance recommends increasing IPAP and/or EPAP according to event type until obstructive apneas, hypopneas, respiratory-effort–related arousals, and snoring are eliminated. Persistent events despite treatment therefore warrant review of whether effective pressures were achieved; a repeat titration is recommended when an optimal or good result was not obtained.
• Inadequate nightly use leaves sleep periods untreated. In a prospective PAP cohort, use of <6 hours was associated with residual obstructive sleep apnea during off-PAP sleep, except among those remaining nonsupine. This finding is principally from CPAP cohorts but is directly relevant to periods when BiPAP is not worn.
• Supine sleep can substantially increase respiratory events in older adults, making untreated time—particularly after mask removal or before application—potentially consequential in this 83-year-old patient.

Mask leak and monitoring

• Significant unintentional leak can compromise effective pressure delivery; titration guidance calls for mask refitting or readjustment, with interface measures when mouth leak is present.
• Leak also reduces confidence in device data. In PAP users, device-reported AHI underestimated home-polygraphy AHI, and agreement deteriorated as leak increased. A seemingly acceptable machine AHI therefore does not reliably exclude residual breathing disturbance when leak is substantial.

Mechanistic and clinical implications

• EPAP primarily addresses upper-airway obstruction, while IPAP adjustments are used according to residual event patterns; insufficient effective pressure permits obstructive events to continue.
• Bottom line: Persistent breakthrough apneas during BiPAP are consistent with inadequate therapeutic pressure, clinically important leak, and/or incomplete nightly use. Practical assessment should prioritize objective usage and leak data, event pattern, and confirmation that pressures were titrated to eliminate obstructive events; persistent events require cause-specific evaluation because not all are obstructive or pressure-responsive.