護理師照護一位氣喘病人，下列哪項評估發現最讓人擔心？

氣喘發作時，呼吸音的變化是評估病情嚴重度的重要指標。當病人出現「沉默胸廓（Silent chest）」現象，即原本的喘鳴音消失且聽不到呼吸音，代表氣道嚴重阻塞，肺部通氣量已降至極低，病人即將進入呼吸衰竭狀態。此時病人可能因極度疲憊而無法維持呼吸功，屬危急情況，需立即採取緊急呼吸道介入措施（如給氧、給予支氣管擴張劑或準備插管）。

During an asthma exacerbation, changes in breath sounds are an important indicator of severity. When the client develops a 'silent chest' — meaning the prior wheezing has disappeared and no breath sounds can be heard — it indicates severe airway obstruction with markedly reduced pulmonary ventilation, and the client is approaching respiratory failure. At this point, the client may be unable to sustain the work of breathing due to extreme fatigue. This is a critical situation that requires immediate airway intervention (e.g., oxygen, bronchodilators, or preparation for intubation).