病人因低血鉀入院，護理師應優先評估下列哪項臨床表現？
A patient is admitted with a diagnosis of hypokalemia. Which finding should the nurse prioritize for immediate assessment?
- ABilateral muscle weakness雙側肌肉無力
- BIrregular heart rhythm on telemetry✓ 正解遠端監測顯示心律不整
- CDry mucous membranes黏膜乾燥
- DReports of constipation主訴便秘
低血鉀（hypokalemia）對心肌細胞的電生理影響最為直接且致命。鉀離子參與心肌去極化與再極化過程，缺乏時會導致心電圖改變（如 U 波出現、T 波平坦或倒置），並易引發危險的心律不整（arrhythmias）。相較於肌肉無力、便秘或黏膜乾燥等非致命徵兆，心律不整威脅生命，因此護理師應優先評估心律監測器（telemetry）。
Hypokalemia has the most direct and lethal electrophysiologic impact on cardiac myocytes. Potassium is involved in myocardial depolarization and repolarization; its deficiency causes ECG changes (such as U waves, flattened or inverted T waves) and easily provokes dangerous arrhythmias. Compared with non-lethal signs such as muscle weakness, constipation, or dry mucous membranes, arrhythmias are life-threatening, so the nurse should prioritize assessment of the cardiac telemetry monitor.