一位創傷性腦損傷患者，護理師應識別出下列哪項症狀為顱內壓增高（ICP）的徵象？
A nurse is assessing a client who has sustained a traumatic brain injury. Which clinical manifestation should the nurse recognize as a sign of increased intracranial pressure (ICP)?
- ATachypnea呼吸過速
- BHypotension低血壓
- CBradycardia✓ 正解心搏過緩
- DTachycardia心搏過速
顱內壓（Intracranial Pressure, ICP）增高時，腦組織受壓迫導致腦缺血，身體為了維持腦灌流壓（CPP）會啟動代償機制。庫欣氏三徵象（Cushing's triad）包含收縮壓升高（脈壓變大）、心搏過緩以及不規則呼吸。心搏過緩的機轉是因為血壓升高導致頸動脈竇受刺激，進而觸發迷走神經反射。這是腦疝（Herniation）發生的前兆，屬於危急狀況，必須立即通知醫師並採取降低 ICP 的措施。
When intracranial pressure (ICP) rises, brain tissue is compressed and ischemic, and the body activates compensatory mechanisms to maintain cerebral perfusion pressure (CPP). Cushing's triad consists of elevated systolic blood pressure (widening pulse pressure), bradycardia, and an irregular breathing pattern. The mechanism of bradycardia is that elevated blood pressure stimulates the carotid sinus, triggering a vagal reflex. This is a precursor of brain herniation and is a critical situation; the provider must be notified immediately and measures to reduce ICP initiated.