[1]Pain Department Taihe Hospital of Shiyan City (Affiliated Hospital of Hubei Medical College) Shiyan 442000 Hubei China;
[2]Anesthesiology Department Taihe Hospital of Shiyan City (Affiliated Hospital of Hubei Medical College) Shiyan 442000 Hubei China;
[3]Center Operating Room Taihe Hospital of Shiyan City (Affiliated Hospital of Hubei Medical College) Shiyan 442000 Hubei China;
Dexmedetomidine; Ultrasound-guided nerve block; Inguinal region surgery; Hemodynamics; Immune function; Cortisol;