病人因低血鉀入院，護理師應優先評估下列何項發現以預防致命併發症？
A client is admitted with hypokalemia. Which assessment finding should the nurse prioritize to prevent life-threatening complications?
- ADecreased bowel sounds腸鳴音減弱
- BPresence of muscle cramps in the legs腿部出現肌肉痙攣
- CGeneralized muscle weakness全身性肌肉無力
- DIrregular heart rhythm on the monitor✓ 正解監測器顯示心律不整
低血鉀（Hypokalemia）會影響心肌細胞的電生理活動，延長再極化過程，導致心律不整（Arrhythmias），這是最直接威脅生命的併發症。護理臨床邏輯首重 ABC（Airway, Breathing, Circulation），心臟功能屬於循環系統的核心，優先順序高於肌肉骨骼或腸胃道症狀。當病人出現低血鉀，護理師需優先監測 ECG 變化，並準備補鉀治療。
Hypokalemia affects the electrophysiological activity of myocardial cells, prolonging repolarization and leading to arrhythmias, which are the most directly life-threatening complications. Nursing clinical reasoning is anchored by ABC (Airway, Breathing, Circulation), and cardiac function is the core of the circulation system, which has a higher priority than musculoskeletal or gastrointestinal symptoms. When the patient presents with hypokalemia, the nurse should prioritize monitoring of ECG changes and prepare for potassium replacement therapy.