Avtor/Urednik		Podnar, Simon; Zalewska, Ewa; Hausmanowa-Petrusewicz, Irena
Naslov		Evaluation of the complexity of motor unit potentials in anal sphincter electromyography
Tip		članek
Vir		Clin Neurophysiol
Vol. in št.		Letnik 116
Leto izdaje		2005
Obseg		str. 948-56
Jezik		eng
Abstrakt		Objective: Motor unit potential (MUP) morphology can be quantified using parameters describing electrophysiological size and shape (complexity). Traditionally, MUP complexity has been estimated using porameters number of phases and turns. Recently, "irregularity coeficient" (IR), measuring the Iength of the MUP curve normalized with its amplitude, has been introduced. The aim of this study was to evaluate IR in the extemal anal sphincter muscle. Methods: Sensitivity was examined in 61 patients with chronic cauda equina lesions, and specificity in 75 controls using a standard concentric EMG needle and EMG system with multi-MUP analysis. Results: When evaluated separately the sensitivity of IR was 16% lower, and specilicity 5% higher compared to number of turnes, with both differences decreasing to only 2 and 1%, respectively, when each of these parameters was added m MUP area und duration. Conclusions: Our present results suggest that IR provides a similar diagnostic usefulness, but a more appropriate description of MUP complexity compared to traditional MUP parameters. Significance: IR scems to be suitable to complement one of MUP parameters measuring electrophysiological MUP size in the future quantitative EMG.
Deskriptorji		ANUS MOTOR NEURONS ELECTROMYOGRAPHY POLYRADICULITIS SPINAL CORD COMPRESSION ACTION POTENTIALS SENSITIVITY AND SPECIFICITY