Motor evoked potentials from the striated urethral sphincter: a comparison of concentric (original) (raw)
Related papers
Motor evoked potentials from the striated urethral sphincter and puborectal muscle: normative values
Aims: The aim of this study is to compare two di¡erent surface electrodes (intravaginal and intraurethral) with the concentric needle as a criterion standard and concomitant testing of the levator ani as a potential contaminator. Methods: Thirty healthy women with a mean age of 52 years. Bland-Altman plots were used to compare recorded latencies from the various electrodes and muscles. Results: There was no signi¢cant di¡erence between the latencies recorded with the various electrodes from either muscle, but the limits of agreement were wide. However, the concentric needle electrodes proved more reliable with a higher rate of reproducible responses. Conclusions: We did not encounter major di⁄culties in using the concentric needle electrode for recordings in the external urethral sphincter, and this electrode was also more reliable than either surface electrode. Therefore, we advocate the use of concentric needle electrodes in future studies.
Clinical Neurophysiology, 2003
Aims: The aim of this study is to compare two di¡erent surface electrodes (intravaginal and intraurethral) with the concentric needle as a criterion standard and concomitant testing of the levator ani as a potential contaminator. Methods: Thirty healthy women with a mean age of 52 years. Bland-Altman plots were used to compare recorded latencies from the various electrodes and muscles. Results: There was no signi¢cant di¡erence between the latencies recorded with the various electrodes from either muscle, but the limits of agreement were wide. However, the concentric needle electrodes proved more reliable with a higher rate of reproducible responses. Conclusions: We did not encounter major di⁄culties in using the concentric needle electrode for recordings in the external urethral sphincter, and this electrode was also more reliable than either surface electrode. Therefore, we advocate the use of concentric needle electrodes in future studies.
Individual motor unit analysis in the diagnosis of disorders of urethral sphincter innervation.
Journal of Neurology, …, 1984
A technique is described for recording the electromyographic activity of striated muscle in the urethral sphincter. Using a concentric needle electrode and an oscilloscope with a delay line and trigger, individual motor units were isolated and measured. To validate the method as a means of detecting pathology, the results are presented of analysis of the motor units of a group of patients with disturbances of micturition, known to have either cauda equina lesions or pelvic nerve injury. These results are compared with those from a group of controls. In the control group 93% of the motor units were less than 6 ms in duration and 2-0 mv in amplitude. Of motor units recorded from patients with cauda equina or pelvic nerve injury 59% exceeded the control ranges for amplitude or duration. It is concluded that quantitative analysis of individual motor units may be a helpful technique in the investigation of patients with disorders of micturition.
American Journal of Obstetrics and Gynecology, 2000
OBJECTIVES: Our aims were to introduce a method of digital quantitative electromyography of the levator ani and external anal sphincter muscles and to establish reference values. STUDY DESIGN: Fifteen nulliparous, symptom-free women underwent concentric needle electromyographic examination of the levator ani and external anal sphincter. We sampled the levator ani transvaginally at 4 sites and the external anal sphincter at 2 sites. The signal was filtered and amplified, and digital recordings were made at 3 levels of voluntary activation at each site. Analyses of motor unit action potentials and interference patterns were performed with the use of these taped signals. Normal ranges were generated and compared with those established for other striated muscles.
Electrourethrogram: Study of the electric activity of the urethra and its clinical significance
International Urology and Nephrology, 2002
Purpose: Apart from the urethral sphincters, the electric activity of the urethra has not been fully addressed in the literature. We investigated the hypothesis that also the non-sphincteric part of the urethra possesses electric activity which may have clinical significance.Materials and methods: Urethral electric activity was studied in 24 healthy volunteers (mean age 40.6 ±: 13.6 years, 14 women). Two
Urethral Electromyography Using a New Ring Electrode
The Journal of Urology, 1978
A new ring electrode to study urethral sphincter electromyographic activity is described. The electrode can be attached to an 18F Foley catheter. Cystometry is a valuable method to study bladder reflex activity in patients with neurological diseases,1•" as well as those with lower urinary tract dysfunction without clinical neurological disease."• ,i The diagnostic value of electromyography from the pelvic floor muscles combined with cystometry is well established.'• 5