一位病人因高血鉀入院，護理師優先應審視哪項檢查？
A client is admitted with hyperkalemia. Which diagnostic test is the priority for the nurse to review?
- AComplete blood count全血球計數
- BChest X-ray胸部X光
- CLiver function tests肝功能檢查
- DElectrocardiogram✓ 正解心電圖
高血鉀（Hyperkalemia）會顯著影響心肌細胞的靜止膜電位，導致去極化異常，進而引發致命性心律不整（如心室顫動或心搏停止）。在 NCLEX 的優先級原則中，評估潛在生命威脅應排在第一位。心電圖（ECG）能即時反映鉀離子對心臟傳導系統的影響，包括 T 波高尖（Peaked T waves）、PR 間期延長、QRS 波變寬等，這些是判斷是否需要立即進行降鉀治療的臨床指標。
Hyperkalemia significantly alters the resting membrane potential of cardiac muscle cells, producing abnormal depolarization that can trigger lethal arrhythmias such as ventricular fibrillation or cardiac arrest. According to NCLEX priority principles, assessment of immediate life-threatening conditions comes first. An electrocardiogram (ECG) provides real-time information about the effects of potassium on cardiac conduction, including peaked T waves, prolonged PR interval, and widened QRS complex, which are key clinical indicators for determining whether immediate potassium-lowering therapy is required.