Average volume-assured pressure support in obesity hypoventilation: A randomized crossover trial

Area of Science:

• Pulmonary Medicine
• Sleep Medicine
• Critical Care

Background:

• Obesity hypoventilation syndrome (OHS) presents challenges for effective ventilatory management.
• Bilevel pressure ventilation (BPV) with spontaneous/timed (S/T) mode is used, but its optimal application requires further study.
• Average volume-assured pressure support (AVAPS) is a newer BPV mode with potential benefits for OHS patients.

Purpose of the Study:

• To investigate the effects of BPV with S/T mode, with and without AVAPS, on OHS patients.
• To assess impacts on ventilation patterns, gas exchange, sleep quality, and health-related quality of life (HRQL).
• To determine the most efficient ventilatory strategy for OHS.

Main Methods:

• A randomized crossover trial was conducted in OHS patients unresponsive to continuous positive airway pressure.
• Patients received BPV in S/T mode, with and without AVAPS, for 6 weeks each.
• Outcomes included ventilation parameters, gas exchange (PtcCO2), sleep quality, and HRQL (using the Severe Respiratory Insufficiency Questionnaire - SRI).

Main Results:

• AVAPS significantly decreased transcutaneous P(CO2) (PtcCO2) by -12.6 mmHg compared to baseline.
• BPV-S/T and BPV-S/T-AVAPS both improved oxygenation, sleep quality, and SRI scores.
• AVAPS demonstrated higher tidal volumes and a trend for lower leak volumes, indicating improved ventilation quality.

Conclusions:

• Bilevel pressure ventilation in S/T mode significantly improves oxygenation, sleep quality, and HRQL in OHS patients.
• AVAPS offers additional benefits in ventilation quality, leading to a more effective reduction in PtcCO2.
• Despite enhanced ventilation, AVAPS did not provide further improvements in sleep quality or HRQL beyond standard BPV-S/T.