TEAS in Liver Patients Needing Urgent Endoscopy for Bleeding Veins

Participants receive real Transcutaneous Electrical Acupoint Stimulation (TEAS) delivered via surface electrodes bilaterally at four predefined acupoints (Hegu \[LI4\], Neiguan \[PC6\], Zusanli \[ST36\], Gongsun \[SP4\]). Stimulation (dense-disperse wave, 2/100Hz frequency, intensity 5-15mA based on tolerance) begins 30 minutes before urgent endoscopy and continues throughout the procedure. All participants receive standard medical management and urgent endoscopy.

Participants receive placebo TEAS. Electrodes are placed identically to the Active TEAS Group at the same four acupoints (Hegu \[LI4\], Neiguan \[PC6\], Zusanli \[ST36\], Gongsun \[SP4\]) using the same device, but no electrical current is delivered. The device appears active to maintain blinding. All participants receive standard medical management and urgent endoscopy.

Participants receive standard urgent endoscopy care only, with no TEAS electrodes or device applied. They receive identical standard medical management and urgent endoscopy as the other groups.