The patient should have spontaneous breathing, but the breathing frequency should be adjustable by the device. The BPAP ST should be tried in cases where BPAP does not enter the respiratory tract, treatment is required at higher pressure, and especially in the presence of central apneas. In patients with obstructive sleep apnea syndrome as well as pathologies leading to alveolar hypoventilation such as restrictive pulmonary disease, COPD, obesity-hypoventilation syndrome, sleep-related hypoventilation / hypoxemic syndrome, it may be advisable to use spontaneous respiration and determination that the triggering power is insufficient.

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