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. There are two kinds of EMG in widespread use in the field of urodynamic investigation: surface patch and intramuscular fine-wire EMG. In our laboratory, the fine-wire electrode is introduced by aid of a needle, we called it needle-guided wire electrode, or simply as wire electrode Xu et al,
Effect of Micturition on the External Anal Sphincter: Identification of the Urethro–Anal Reflex
A study on the response of the external anal sphincter EAS to the passage of urine through the urethra during micturition could not be found in the literature. We investigated the hypothesis that urine passage through the urethra effects EAS contraction to guard against possible flatus or stool leakage during micturition. The study was performed in 23 healthy volunteers age, The test was repeated after individual anesthetization of the EAS and urethra.
Anal Sphincter Electromyogram for Dysfunction of Lower Urinary Tract and Pelvic Floor
Thirty-three women with urinary incontinence — 26 with stress and 7 with urge incontinence — were examined with anal profilometry, a low complaint recording system using a perfusion catheter. No statistical differences were found in anal variables between the two subgroups. Individual urethral and anal pressures were unrelated. Seventeen women reported problems with anal incontinence, of whom all but one belonged to the stress incontinent subgroup. We conclude that women with stress urinary incontinence often have concomitant symptoms of anal incontinence i.
The urethral sphincters are two muscles used to control the exit of urine in the urinary bladder through the urethra. The two muscles are either the male or female external urethral sphincter and the internal urethral sphincter. When either of these muscles contracts, the urethra is sealed shut. The external urethral sphincter originates at the ischiopubic ramus and inserts into the intermeshing muscle fibers from the other side. It is controlled by the deep perineal branch of the pudendal nerve.