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The day before the examination began a real stimulation treatment, namely, intestinal pacing (① location: positive pole placed on the navel (the line between the raphe and navel) 1 to 2 cm, the negative pole in the raphe and the navel line at the midpoint of the right 4 to 10 cm; ② parameters: the intestinal frequency: 2.4-3.7 cpm, the first time the frequency of use of 3.0 cpm, treatment of the base wave intensity of 0-15 gears, the first time to use the intestinal treatment intensity of 10 gears) , acupoint stimulation (① location: treatment sheet attached to both legs ST36 acupoints, i.e., four transverse fingers below the eye of the outer knee, 4 transverse fingers next to the tibia; ② parameters: the first use of acupoint intensity 30%, to the patient's self-conscious stimulation points have a slight pinprick sensation, lifting sensation, warm sensation is appropriate).

A sham stimulation treatment was started one day before the examination, i.e., intestinal pacing treatment with the electrode pads offset to the lumbar side to stimulate the sham acupoints, and acupoint stimulation with the treatment pads applied to the ST36 acupoints but without turning on the current switch.