一位病人使用胸腔引流瓶（水封瓶），哪項發現代表系統運作正常？
A nurse is caring for a client with a chest tube connected to a water-seal drainage system. Which finding indicates the system is working properly?
- AFluctuation of the fluid in the water-seal tube during inspiration✓ 正解吸氣時水封管內液體的波動
- BContinuous bubbling in the water-seal chamber水封腔內的持續冒泡
- CClamping the tube to prevent air leaks夾住管子以防止漏氣
- DAbsence of any drainage in the collection chamber收集腔內無任何引流液
水封瓶正常運作時，隨呼吸動作，胸腔內壓力變化會導致水柱隨呼吸起伏（Tidaling）。持續氣泡通常代表胸膜腔內仍有漏氣或系統密封不全，而非正常狀態。胸管不可隨意夾閉，以免造成緊張性氣胸。引流量依病況而定，並非無引流即代表正常。
Proper function of a water-seal drainage system is indicated by tidaling, where the fluid in the water-seal tube fluctuates with the client's respiration due to changes in intrathoracic pressure. Continuous bubbling in the water-seal chamber typically suggests an air leak within the system rather than normal operation. Clamping the chest tube is contraindicated as it risks causing a tension pneumothorax, and the presence of drainage depends on the specific clinical condition.
美國護理指引明確禁止夾閉胸管；台灣早期教學有時會提及檢查漏氣時短暫夾閉，但現代實務已趨於一致嚴格禁止。