病人被診斷為體液容積不足。下列哪項評估發現最能代表此狀況？
A client is diagnosed with fluid volume deficit. Which assessment finding is most indicative of this condition?
- APeripheral edema周邊水腫
- BIncreased urine output尿液排出量增加
- CTachycardia✓ 正解心跳過速
- DBounding pulse強而有力的脈搏
體液容積不足（Fluid volume deficit）時，循環血量下降導致心輸出量減少。身體為了維持重要器官的灌流，會啟動交感神經系統，引起心跳速率代償性加快（Tachycardia）。這是脫水早期的生理反應。其他選項中，水腫與強脈搏多見於體液過多，而尿量增加則多見於初期脫水後的腎代償或糖尿病，後期脫水尿量會減少。
In fluid volume deficit, circulating blood volume decreases and cardiac output falls. To maintain perfusion to vital organs, the sympathetic nervous system is activated, producing a compensatory increase in heart rate (tachycardia). This is an early physiological response to dehydration. Of the other options, edema and a bounding pulse are seen with fluid overload; increased urine output occurs in early renal compensation or diabetes-related conditions, while urine output decreases later in dehydration.