Author/Editor | Podnar, Simon; Vodušek, David B; Stalberg, Erik | |
Title | Standardization of anal sphincter electromyography: normative data | |
Type | članek | |
Source | Clin Neurophysiol | |
Vol. and No. | Letnik 111 | |
Publication year | 2000 | |
Volume | str. 2200-7 | |
Language | eng | |
Abstract | Objectives. Electromyography (EMG) of the external anal sphincter (EAS) is important in the evaluation of conus/cauda lesions, the differential diagnosis of parkinsonism and anal incoentinence. The aim of our study was to establish normative data in a sufficiently large group of healthy subjevts, using a rigorously standardized examination technique. Methods. Sixty-four subjects (aged 19-83 years) without pelvic or neurological disorders were included. Motor unit potentials (MUPs/interfernece pattern (IP) samples were obtained from the EAS using multi-MUP and turn/amplitude analyses, respectively. The effect of age, gender. parity, and constipation on MUP/IP parameters was studied. For MUP parameters the lower/upper limits for mean values, and "outlier" limits, and for IP parameters normal "clouds" were calculated. Results. From 112 muscles 15-30 MUPs were sampled. As no effect of evaluated factors on mean values could be demonstrated, common reference values were calculated. Lower/hogher limits for mean values were: amplitude 148/661 microV, duration 3..2/7.8 ms, area 87/625 microV ms, and number of phases 2.3/3.7. "Outliner" limits for individual MUPs were: amplitude 84/1315 microV, duration 1.6/13.8 ms, area 46/1222 mikroV ms, number of phases 2/6. From 95 muscles 2706 IP samples were obtained. Consluions. The presented normative data should allow valid qualtitative EMG of the EAS muscle in patients. | |
Descriptors | ANUS ELECTROMYOGRAPHY REFERENCE VALUES ACTION POTENTIALS CONSTIPATION SEX FACTORS AGE FACTORS PELVIC FLOOR |