Objective:Assessment about the diagnostic value of Electromyogram(EMG)on puborectalis syndroma.Methods:We divided 55 constipation patients and 15 normal volunteers into the puborectalis normal group

the puborectalis abnormal group and the normoal control group by the clinical symptoms

the rectal touch and the results of defecography.Then we analyzed the EMG results of three groups.Results:①Quantitate Mup analysis of EMG:All the indexes of the normal control group and the puborectalis normal group have not significant difference during resting and defecating phases;The indexes(including Ampl

Area and Freq)of abnormal group are much higher in defecating phase than in resting phase

and the Ampls of abnormal group during resting phase are also evidently higher than which of the control group and the puborectalis normal group;Yet the ratios Ar to Am are much lower than which of the other groups(P<0.05).②Analysis of interfered phase(IP):In abnormal group

the indexes(including Turn

Ampl

T/A

Activity and Envelop)in defecating phases are much higher than which in resting phases

and these indexes in resting phases are significantly higher than those in the normal control and puborectails normal groups(P<0.05).Conclusion:Through the examination of electromyogra of the constipation patients we found that dysfunction of myoelectric activity of puborectal muscle is the cause of puborectalis syndrome.For this reason

electromyogra

especially the analysis of interfered phase

can estimate the functional ststus of pelvis-base muscles of the constipation patients

which can be also used for assisting the diagnoses and theraphy.