Résumé :
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Introduction :Monitoring of non invasive ventilation (NIV) is recommended with nocturnal polygraphy or polysomnography in neuromuscular diseases. Some ventilators have automatic polygraphy available, estimating SpO2, leaks, and obstructiv events. It could be an interesting tool to monitore nocturnal ventilation. Aim of the study : We compared the results between classical polygraphy and automatic polygraphy during NIV Methods : 20 patients with ALS were monitored with a polygraphy (PG) (Embletta, resmed, Australia), and during the same night, they have a automatic polygraphy (AutoPG)(Reslink, Resmed, Australia). A patient was considered badly ventilated if he has more than 5% of the time <90% of SpO2. Results : the same 14 patients/20 were considered as badly ventilated in PG and autoPG. The diagnosis for PG and autoPG were : Leaks for 2 vs 3 patients (NS), obstructive events for 3 vs 9 patients (p<0,01), mixed events (obstructiv and central) in 4 vs O (p<0,0001), asynchronism in 4 vs 0 (p<0,0001) and central hypoventilation in 1 vs 2 (NS). Conclusion : AutoPG gives the right information about good ventilation and leaks, but always answer obstructiv events for real obstructiv events, asynchronism and mixed events. In 60% of badly ventilated patients the diagnosis was wrong with AutoPG.
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