Nocturnal Nasal Continuous Positive Airway Pressure in Aspiration Pneumonia

Inclusion Criteria: * Age ≥ 65 years * Diagnosis of pneumonia: the presence of new pulmonary infiltration in dependent areas on chest radiographs at the time of hospitalization with at least one of the following 1. New or increased cough 2. Abnormal temperature (\< 35.6℃ or \> 37.8℃) 3. Abnormal serum leukocyte count (leukocytosis, left shift, or leukopenia) * Aspiration tendency or risk factors for frequent or large volume aspiration with at least one of the following 1. Altered mental status 2. Gastrointestinal disorder 3. Dysphagia or swallowing difficulties 4. Esophageal motility disorders 5. Tracheostomy state 6. Enteral tube feeding * Informed consent Exclusion Criteria: * Severe hypercapnia (PaCO2 \> 70mmHg) * Respiratory arrest requiring tracheal intubation * Cardiac arrest, acute coronary syndrome or life threatening arrhythmias * Failure of more than two organs * Recent trauma or burns of the neck and face * Non- cooperation * Pregnancy * Withdrawal of consent * Refusal of treatment