Clinical Study on Yiqi Kaimi Recipe Combined with Biofeedback in the Treatment of Functional Constipation with Rectal Hyposensitivity

INTERVENTION: Polyethylene glycol 4000:Polyethylene glycol 4000;Yiqi Kaimi Recipe:Yiqi Kaimi Recipe;Yiqi Kaimi Recipe + biofeedback:Yiqi Kaimi Recipe combined with biofeedback; CONDITION: functional constipation with rectal hyposensitivity PRIMARY OUTCOME: Cleveland clinic score, CCS; SECONDARY OUTCOME: Patient assessment of constipation quality of life;Patient assessment of constipation symptom, PAC‐SYM; Gastrointestinal electromyography;Rectal sensation;Anorectal manometry; INCLUSION CRITERIA: (1) Diagnostic with functional constipation by Rome ?;and Diagnostic with low rectal sensitivity:Rectal sensation measurement: the minimum sensation threshold is more than 20ml, the initial defecation threshold is more than 60ml or the maximum tolerance threshold is more than 250ml, which meet one or more requirements. (2) syndrome with Qi and yin deficiency in traditional Chinese medicine; (3) Unlimited course of disease; (4) Patients aged from 18 to 80 (regardless of gender); (5) Patients who have signed informed consent. v