To describe perineal surface patch electromyography EMG activity during urodynamics UDS and compare activity between filling and voiding phases and to assess for a relationship between preoperative EMG activity and postoperative voiding symptoms. Pressure-flow studies were evaluated for abdominal straining and interrupted flow. Quantitative EMG values were extracted from 10 predetermined time-points and compared between fill and void. Postoperative voiding dysfunction was defined as surgical revision or catheterization more than 6 weeks after surgery. Quantitative and qualitative EMG signals during flow were usually greater than during fill. The prevalence of postoperative voiding dysfunction in subjects with higher preoperative EMG activity during void was not significantly different.
Anal Sphincter Electromyogram for Dysfunction of Lower Urinary Tract and Pelvic Floor
Anorectal manometry also called rectal manometry, ARM, or AM - Anorectal manometry is a test that evaluates bowel function in patients suffering from fecal incontinence or chronic constipation. The technique uses a small balloon in the rectum to distend the rectum and looks at: the strength of the anal sphincter muscles, sensations of stool in the rectum, reflexes that govern the bowel, and movements of the rectal and anal muscles. See Figure 1 showing a balloon. Anorectal manometry is a very important diagnostic tool used in the full and proper assessment of fecal incontinence and chronic constipation. The anal and the rectal area contains specialized muscles that regulate the proper passage of bowel movements. Normally, when stool enters the rectum, the anal sphincter muscle tightens to prevent passage of stool at an undesirable time.
In this study the correlation between the electromyographic examination of the external sphincter muscle and the urodynamic findings in patients with meningomyelocele was evaluated. Urodynamic testing, consisting of cystometry with bladder, urethral and abdominal pressure monitoring was performed with simultaneous electromyography of the external and sphincter muscle in 61 children, 29 boys and 32 girls, divided in groups according to age and to the level of lesion. Normal urodynamic studies were always correlated with normal external sphincter electromyography. The clinical neurological level of the lesion was not correlated with the function of the detrusor-sphincter mechanism. These findings thus show a significant correlation between electromyography of the external sphincter muscle and the urodynamic findings in meningomyelocele patients, and clearly demonstrate the importance of urodynamic testing with simultaneous external sphincter electromyography, in order to improve both diagnostic accuracy and reliability of follow-up and treatment.
Advances in Applied Electromyography. The electromyogram EMG is a diagnostic tool that measures and records the electrical activity produced by skeletal muscles. The anal sphincter and urethral external sphincter are skeletal muscle in nature.