— 生理適應 · HARD · MCQ —
病人入院時血鉀濃度為 6.2 mEq/L，護理師應優先回報哪項心電圖表現？
A client is admitted with a potassium level of 6.2 mEq/L. Which EKG finding should the nurse prioritize reporting?
- AFlattened T wavesT波平坦
- BProlonged PR intervalPR間期延長
- CTall, peaked T waves✓ 正解高大尖銳的T波
- DPresence of U waves出現U波
— Explanation · 中文詳解 —
高血鉀症的早期心電圖特徵為 T 波尖銳高聳（Tall, peaked T waves）。隨著濃度升高，可能出現 PR 間期延長、QRS 波變寬及心律不整。若未即時處置，可能進展為心室纖維顫動或心跳停止。選項 A 與 D 為低血鉀的特徵，故不相關。
Tall, peaked T waves are the classic early electrocardiographic manifestation of hyperkalemia, reflecting the effect of elevated serum potassium on cardiac repolarization. This finding requires immediate reporting and intervention to prevent progression to life-threatening dysrhythmias such as ventricular fibrillation.
✦ 台美臨床差異
美台對於高血鉀處理原則一致，但在美國護理師更常透過遠距監控系統即時發現心律變化。