This is an observational study of recording the respiratory parameters of patients when receiving non-invasive ventilation and analyze the relationship between those parameters and clinical outcomes.

Non-invasive positive pressure ventilation (NPPV) is undoubtedly one of the most important advances in mechanical ventilation technology in the past 30 years. Currently, NPPV has become an essential respiratory support technology in hospitals, and it is used in different fields, including respiratory and critical care, emergency care, anesthesia, and rehabilitation. Applications of NPPV are also gradually expanding from intensive care units (ICUs) and respiratory wards to use in other medical departments and at home.

This is an observational study of recording the respiratory parameters of patients when receiving non-invasive ventilation and analyze the relationship between those parameters and clinical outcomes.

Inclusion Criteria:

1. Age 18-80, males and females
2. Patients with hypercapnic respiratory failure
3. Willing to participate in the study.
4. Being able to provide informed consent.

Exclusion Criteria:

1. Subjects with severe heart failure, severe arrhythmias, unstable angina, and malignant comorbidities.
2. Subjects with significantly impaired cognitive function and are unable to fulfill the study requirement (unable to provide informed consent)
3. Subjects who participated in another trial within 30 days prior to the planned start of the study

Patients with hypercapnic respiratory failure who need to use non-invasive ventilation.