一位慢性阻塞性肺病（COPD）病人被處方氧氣治療。護理師應以何種流速給予氧氣，以維持 SpO2 在 88-92%？
A client with chronic obstructive pulmonary disease (COPD) is prescribed oxygen therapy. The nurse should administer oxygen at which flow rate to maintain SpO2 between 88-92%?
- AOxygen at 2 L/min via nasal cannula✓ 正解經鼻導管以2 L/min給氧
- BHigh-flow oxygen via non-rebreather mask經非再吸入面罩給予高流量氧氣
- COxygen at 10 L/min via nasal cannula經鼻導管以10 L/min給氧
- DIntermittent positive pressure breathing (IPPB)間歇性陽壓呼吸（IPPB）
COPD 病人長期的二氧化碳滯留，使得呼吸中樞對二氧化碳的敏感度下降，轉而依賴「低血氧」作為呼吸的驅動力（Hypoxic drive）。若給予高流量氧氣，會移除此呼吸驅動，導致病人呼吸深度變淺或停止，引發二氧化碳過高（CO2 narcosis）。因此，臨床給予 COPD 病人氧氣時，通常採低流量（如鼻導管 1-2 L/min），以維持 SpO2 在 88-92% 的安全範圍。
Long-standing CO2 retention in COPD patients reduces the central chemoreceptors' sensitivity to carbon dioxide, leaving the patient dependent on hypoxia as the respiratory drive (hypoxic drive). Administering high-flow oxygen removes this drive, causing shallow breathing or apnea and triggering CO2 narcosis. Therefore, oxygen is typically administered to COPD patients at low flow rates (such as 1-2 L/min by nasal cannula) to keep SpO2 within the safe range of 88-92%.