一位病人出現低血容性休克徵兆，護理師應先執行下列哪項措施？
A client presents with signs of hypovolemic shock. Which intervention should the nurse perform first?
- AObtain a urine output measurement測量尿液排出量
- BAdminister an isotonic fluid bolus✓ 正解給予等張液體快速輸注
- CElevate the client's legs抬高病患雙腿
- DAdminister vasopressors給予升壓劑
低血容性休克（Hypovolemic shock）的病理生理核心在於循環血量不足，導致組織灌流下降。根據 ABC（氣道、呼吸、循環）優先級原則，首要任務是恢復循環容量。快速輸注等張晶體溶液（Isotonic fluid bolus）能迅速擴充血管內容量，維持心輸出量。升壓劑在未補足血量前使用效果不佳，且可能加重周邊血管收縮。測量尿量雖重要，但屬於評估灌流成效的後續步驟。護理重點在於立即啟動復甦流程以防止器官衰竭。
The core pathophysiology of hypovolemic shock is insufficient circulating blood volume, which reduces tissue perfusion. Following the ABC (airway, breathing, circulation) priority framework, the first task is to restore circulating volume. A rapid bolus of isotonic crystalloid quickly expands the intravascular volume and maintains cardiac output. Vasopressors are not effective before volume has been replaced and may worsen peripheral vasoconstriction. Although measuring urine output is important, it represents a subsequent step for evaluating the effectiveness of perfusion. The nursing priority is to initiate resuscitation immediately to prevent organ failure.