一位低血鉀症患者正在接受氯化鉀靜脈輸注。下列哪項護理措施是必要的？

低血鉀（Hypokalemia）是指血液中鉀離子濃度低於正常範圍（約 3.5-5.0 mEq/L）。鉀離子對於維持細胞膜電位穩定，特別是心肌細胞的正常運作至關重要。低血鉀會導致心肌細胞的靜息電位變淺，容易過度興奮，進而引發各種心律不整，嚴重時可能導致心臟驟停。 靜脈注射氯化鉀（Potassium Chloride, KCl）是糾正低血鉀的標準治療方式。然而，KCl 具有強烈的組織刺激性，若給藥速度過快或濃度過高，可能引起靜脈炎（Phlebitis）、血管疼痛，甚至血管痙攣或壞死。更嚴重的是，KCl 快速進入血液可能瞬間提高心臟局部鉀離子濃度，引發致命性的心律不整。因此，KCl 的靜脈輸注必須緩慢且謹慎。 選項 D 是正確的。對於周邊靜脈（Peripheral line）輸注 KCl，為了安全起見，輸注速率通常限制在每小時 10-20 mEq。超過此速率會顯著增加心律不整和血管損傷的風險。此為預防嚴重副作用的必要措施。 選項 B 是錯誤的。絕對禁止將 KCl 以「靜脈推注」（IV push）方式給予，無論是經周邊或中心靜脈。KCl 推注極易導致瞬間高血鉀，引發心臟驟停。 選項 A 是錯誤的。監測血糖（Blood glucose levels）與糾正低血鉀並無直接關聯，除非病人同時患有糖尿病且有血糖異常的狀況，否則不是此情況下的必要監測項目。 選項 C 是錯誤的。使用保暖毯（Warming blanket）主要用於處理體溫過低（Hypothermia）的病人，與低血鉀的治療或氯化鉀輸注沒有直接關聯。

Hypokalemia is defined as a serum potassium concentration below the normal range (approximately 3.5-5.0 mEq/L). Potassium is essential for maintaining the resting membrane potential of cells, particularly the normal function of cardiac muscle cells. Hypokalemia causes the resting potential of myocardial cells to become shallower, making them prone to over-excitation and triggering various dysrhythmias, which may lead to cardiac arrest in severe cases. Intravenous potassium chloride (KCl) is the standard treatment for correcting hypokalemia. However, KCl is highly irritating to tissues; if administered too rapidly or at too high a concentration, it may cause phlebitis, vascular pain, or even vasospasm or necrosis. More critically, rapid entry of KCl into the bloodstream may instantaneously raise local cardiac potassium concentrations, triggering fatal dysrhythmias. Therefore, IV infusion of KCl must be performed slowly and cautiously. Option D is correct. For KCl infusion via a peripheral line, the infusion rate is generally limited to 10-20 mEq per hour for safety. Exceeding this rate significantly increases the risk of dysrhythmias and vascular damage. This is a necessary measure to prevent serious adverse effects. Option B is incorrect. KCl must never be administered by IV push, whether through a peripheral or central line. IV push of KCl can readily cause instantaneous hyperkalemia, leading to cardiac arrest. Option A is incorrect. Monitoring blood glucose levels is not directly related to the correction of hypokalemia. Unless the patient also has diabetes with abnormal glucose readings, it is not a necessary monitoring parameter in this situation. Option C is incorrect. A warming blanket is primarily used to manage hypothermia and is not directly related to the treatment of hypokalemia or the administration of potassium chloride.