Airway occlusions to measure inspiratory effort, respiratory drive, and lung mechanics during noninvasive ventilation.
Francesco Murgolo, Domenico Luca Grieco, Rossana Soloperto et al.
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In 30 seconds
This multicenter randomized study assessed whether airway occlusion maneuvers can estimate inspiratory effort, respiratory drive, and lung mechanics during noninvasive ventilation (NIV). Sixty hypoxemic patients underwent two randomized one-hour NIV sessions after extubation, using oronasal and full-face masks. Occlusion pressure (Pocc) was measurable in all patients, and Pocc-derived estimates agreed with esophageal-pressure reference measures of inspiratory effort and dynamic transpulmonary driving pressure. Predicted effort identified marked inspiratory effort with areas under the curve of 0.98 and 0.97 for the two mask types. Ventilator-derived P0.1 and plateau pressure were less reliable.
Key findings
- Pocc was measurable in all patients; Pocc-derived estimates of inspiratory effort and dynamic transpulmonary driving pressure showed agreement with esophageal manometry.
- Predicted ΔPes identified observed ΔPes ≤ -10 cm H2O, with areas under the receiver operating characteristic curve of 0.98 (oronasal) and 0.97 (full-face).
- P0.1 values >2.7 cm H2O with the oronasal mask and >3 cm H2O with the full-face mask identified high drive with specificity >90%, but P0.1 did not precisely quantify drive.
- Plateau pressure was unstable in 78% (oronasal) and 90% (full-face) of patients.
Why it matters
Assessing inspiratory effort and lung stress during NIV may help identify patients experiencing excessive respiratory loading, while conventional ventilator measurements may be unreliable. These findings support the potential value of occlusion-derived estimates as bedside physiological measures, although they were evaluated against esophageal manometry in a specific post-extubation population.
What to keep in mind
The study evaluated hypoxemic patients during short NIV sessions after extubation; the abstract does not establish performance in other populations or longer-term clinical benefit.