Contraindications
Positive airway pressure therapy may be contraindicated in some patients with the following pre-existing conditions:
severe bullous lung disease
pneumothorax or pneumomediastinum
pathologically low blood pressure, particularly if associated with intravascular volume depletion
dehydration
cerebrospinal fluid leak, recent cranial surgery, or trauma.
ASV therapy is contraindicated in patients with chronic, symptomatic heart failure (NYHA 2-4) with reduced left ventricular ejection fraction (LVEF ≤ 45%) and moderate to severe predominant central sleep apnea.