病人被開立速尿靈（Furosemide）40 mg 靜脈推注。給藥前護理師應評估什麼？
A client is prescribed furosemide 40 mg IV push. Which assessment should the nurse perform before administration?
- APotassium level✓ 正解鉀離子濃度
- BBlood glucose血糖
- CRespiratory rate呼吸頻率
- DBlood pressure血壓
速尿靈（Furosemide）是一種強效環利尿劑（Loop diuretic），其作用機轉為抑制腎小管對鈉、氯與鉀的再吸收，導致這些電解質隨尿液大量排出。低血鉀（Hypokalemia）是使用此藥最常見且危險的併發症，因為鉀離子過低會嚴重影響心臟電生理，引發心律不整。因此，給藥前確認鉀離子濃度是確保藥物安全的核心行動。
Furosemide is a potent loop diuretic that works by inhibiting reabsorption of sodium, chloride, and potassium in the renal tubules, leading to substantial urinary loss of these electrolytes. Hypokalemia is the most common and dangerous complication of this medication, because low potassium seriously affects cardiac electrophysiology and can precipitate dysrhythmias. Therefore, verifying the serum potassium level before administration is the core action to ensure medication safety.