護理師準備靜脈注射氯化鉀，為預防組織壞死，下列哪項防護措施至關重要？
A nurse is preparing to administer potassium chloride intravenously. Which precaution is essential to prevent tissue necrosis?
- ADilute the medication in at least 100 mL of normal saline將藥物稀釋於至少 100 mL 的生理鹽水中
- BInfuse the medication through a small-gauge peripheral vein通過小口徑周邊靜脈輸注藥物
- CEnsure the IV site has a patent blood return✓ 正解確保靜脈注射部位有血液回流
- DAdminister the medication as a rapid IV bolus快速靜脈推注藥物
氯化鉀（KCl）具有高度刺激性，若發生滲漏至皮下組織（Extravasation），極易導致組織壞死與永久性損傷。在靜脈給藥前，護理師必須確認管路通暢並有血液回流（Blood return），以確保藥物確實進入靜脈血管中。氯化鉀絕對禁止靜脈推注（IV bolus），且應盡量稀釋，因為高濃度鉀離子會引起靜脈炎與組織損傷。
Potassium chloride (KCl) is highly irritating; extravasation into subcutaneous tissue readily causes tissue necrosis and permanent injury. Before intravenous administration, the nurse must confirm that the line is patent and that blood return is present to ensure that the medication is being delivered into the vein. Potassium chloride must never be given as an IV bolus and should always be adequately diluted, because high-concentration potassium ions cause phlebitis and tissue damage.