對於多重外傷病人，哪項評估發現最能預示早期低血容性休克？

在低血容性休克（hypovolemic shock）早期，身體為了維持重要器官的灌流，會啟動交感神經系統，釋放腎上腺素導致心跳加快（tachycardia）。這是休克代償期（compensated stage）最早出現的生理徵兆。低血壓（B）通常發生在失代償期（decompensated stage），當代償機制衰竭時才會出現。皮膚濕冷（A）是血液重新分配的結果，尿量減少（C）則是腎臟灌流不足的表現，兩者雖為休克徵兆，但在早期階段，心跳數值變化通常較血壓與尿量改變更早被偵測到。

In the early stage of hypovolemic shock, the body activates the sympathetic nervous system to maintain perfusion of vital organs, releasing epinephrine and causing tachycardia. This is the earliest physiologic sign of the compensated stage of shock. Hypotension (B) typically appears in the decompensated stage, when compensatory mechanisms fail. Cool, clammy skin (A) results from blood redistribution, and decreased urine output (C) reflects inadequate renal perfusion; both are signs of shock, but in the early stage, changes in heart rate are usually detected before changes in blood pressure or urine output.