— 生理適應 · MEDIUM · MCQ —
病人入院時血鉀濃度為 6.8 mEq/L。護理師預期心電圖監測器會出現哪種心律異常？
A client is admitted with a potassium level of 6.8 mEq/L. Which rhythm alteration should the nurse anticipate on the cardiac monitor?
- AU wavesU 波
- BFlattened T wavesT 波平坦
- CTall, peaked T waves✓ 正解高聳尖銳的 T 波
- DProlonged QT intervalQT 間期延長
— Explanation · 中文詳解 —
高血鉀（Hyperkalemia）對心肌具有嚴重毒性。當血鉀濃度高達 6.8 mEq/L 時，心電圖（EKG）會出現典型改變，包括高聳且尖銳的 T 波（Tall, peaked T waves），這是由於心肌細胞再極化過快所致。若未及時處理，隨後會出現 PR 間期延長、QRS 波變寬，最終導致致命性的心室顫動（VF）。
Hyperkalemia is severely toxic to the myocardium. When the serum potassium level reaches 6.8 mEq/L, the ECG shows characteristic changes, including tall, peaked T waves due to accelerated repolarization of cardiac cells. If not treated promptly, this is followed by prolongation of the PR interval and widening of the QRS complex, eventually leading to lethal ventricular fibrillation (VF).