Study On The Relationship Between The Stress Urinary Incontinence And Surface Electromyography Of Pelvic Floor Muscles

Background and ObjectiveStress urinary incontinence (SUI) is a common disease that affects seriously the health and the quality of life of women with SUI. 9%～60% women suffer from different degrees of SUI. So far, there has not been any objective and exact standard which could evaluate the pelvic function because doctors always do that by asking patients the SUI symptoms. And there were few precise parameters of the pelvic floor muscles (PFM). The objective of this study is to describe perinea electrophysiological findings and to investigate the clinic meaning of the surface EMG activity of PFM in predicting and diagnosing female SUI.Methods57 women with SUI and 57 controls were measured with a vaginal surface EMG probe in supine position for the surface EMG activity of PFM. And 20 of them were measured both in supine position and standing position.Results(1) The calculated mean peak value of the rapid contractions of the SUI and the controls were 14.56μV and 21.67 μV, respectively. And the difference was significant (P<0.05). Besides, the vigor, the energy and the right rest value of pelvicfloor muscles of the SUI were significantly lower than those of the controls (P<0.05).(2) The vigor, the peak value and the energy of pelvic floor muscles of SUI from degree II, III were significantly lower than those of degree I (P<0.05).(3) The vigor, peak and energy values were significantly dependent on age (P<0.05), parity (P<0.05), mode of delivery (P<0.05) and prolapse of anterior wall of vagina (P<0.05).(4) The vigor and energy values of left pelvic floor muscles were lower than those of right one (P<0.05), there was no difference between the peak valves of both sides of pelvic floor muscles.(5) There were no differences between the surface electromyography signals which were measured both in supine position and standing position.Conclusions(1) The surface electromyography signals of pelvic floor muscles of SUI were significantly lower than those of the controls.(2) To a certain degree, the surface electromyography signals were negatively correlated with the severity of SUI.(3) There were no differences between the surface electromyography signals which were measured in different position; the surface electromyography signals were dependent on age, parity, mode of delivery and prolapse of anterior wall of vagina.