一位慢性腎臟病（CKD）病人血鉀濃度為 6.5 mEq/L。護理師應優先評估哪項發現？
A client with chronic kidney disease (CKD) presents with a potassium level of 6.5 mEq/L. Which assessment finding should the nurse prioritize?
- APresence of generalized muscle weakness出現全身性肌肉無力
- BDecrease in urine output尿量減少
- CReports of abdominal cramping主訴腹部痙攣
- DPresence of peaked T waves on ECG✓ 正解心電圖出現尖峰 T 波
高血鉀（Hyperkalemia）對心臟電生理活動具有立即且致命的威脅。血鉀濃度 6.5 mEq/L 已屬嚴重等級。高鉀會改變心肌細胞膜電位，最先出現的典型心電圖變化為「尖峰 T 波（peaked T waves）」，隨後可能進展為 PR 間期延長、QRS 波變寬，最終導致室性心律不整或心搏停止。因此，評估心電圖是防止死亡的優先護理措施。
Hyperkalemia poses an immediate and lethal threat to the heart's electrical activity. A potassium level of 6.5 mEq/L is in the severe range. High potassium alters the membrane potential of myocardial cells, and the earliest typical ECG change is peaked T waves, which may progress to prolonged PR interval, widened QRS complex, and ultimately ventricular arrhythmia or cardiac arrest. Therefore, ECG assessment is the priority nursing measure to prevent death.