Electroacupuncture Analgesia for Colonoscopy

Patients randomized to the experimental group will receive electroacupuncture at acupoints relevant to the treatment of abdominal pain and anxiety, including Zusanli (stomach meridian ST-36), Hegu (large intestine meridian LI-4), and Neiguan (pericardium meridian PC-6). Electric stimulation will be employed to the needles

"Sterile blunt-tip needles will be placed (without skin penetration) 15 mm away from the acupoints. Pseudostimulation will be given by deliberately connecting the needle to the incorrect output socket of the electroacupuncture device, thus there will be no flow of electric current."