Millimeter wave radar will be used to conduct non-contact monitoring continuously for patients' vital signs (eg. respiratory rate, heart rate, and chest/abdominal movement). The monitoring information will be transmitted to the central system through network and displayed in real time. Comparison with polysomnography will be done to examine the consistency between the two devices in diagnosing sleep breathing disorders. The predictive model of acute exacerbations of COPD will be established with the baseline indicators considered.
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Apnea Hypopnea Index in times per hour
Timeframe: At baseline and millimeter wave radar monitoring continues during one month's or one year's follow-up
Oxygen saturation in percent
Timeframe: At baseline and millimeter wave radar monitoring and pulse oximeter continues during one month's or one year's follow-up
Respiratory rate in breaths per minute
Timeframe: At baseline and millimeter wave radar monitoring continues during one month's or one year's follow-up
Heart rate in beats per minute
Timeframe: At baseline and millimeter wave radar monitoring continues during one month's or one year's follow-up
Chest/abdominal movement and others
Timeframe: At baseline and millimeter wave radar monitoring or other devices continues during one month's or one year's follow-up
Diagnosis of COPD according to lung function
Timeframe: At baseline
Diagnosis of sleep apnea hypopnea syndrome according to the times of apnea and hypopnea or AHI (RDI) with certain symptoms
Timeframe: At baseline