Brian S Foley1, Eric T Roslonski, Ralph M Buschbacher. 1. Department of Physical Medicine and Rehabilitation, Indiana University School of Medicine, Indianapolis, IN 46202, USA. bsfoley@iupui.edu
Abstract
OBJECTIVE: To derive a normative database for nerve conduction values of the median nerve to the pronator quadratus using a large and varied subject population. DESIGN: Descriptive study. SETTING: Private office or university-based clinic. PARTICIPANTS: Volunteers (N=207), recruited, without risk factors for neuropathy. INTERVENTIONS: Not applicable. MAIN OUTCOME MEASURES: Onset latency, duration, amplitude, and area were recorded for all subjects. Side-to-side variability was calculated and the normative ranges were derived (97th percentile of observed values). RESULTS: Because the latencies increased with longer distances (longer forearms), the data were divided into 3 categories. The mean latency for those subjects whose distance from stimulator to recording electrode was 23 cm or less was 3.8+/-0.4 ms; the comparable values for those subjects with distances of 23.5 to 24.5 cm was 4.0+/-0.4 ms; and for those with distances of 25 cm and more, 4.5+/-0.4 ms. The amplitude and area varied with age. The mean amplitude for those subjects under 60 years of age was 4.4+/-1.8 mV, while those 60 years and over had an amplitude of 3.7+/-1.7 mV. The upper limit of normative side-to-side variability for latency was 0.6 ms, and the upper limit decrease in amplitude from 1 side to the other was 37%. CONCLUSIONS: This study establishes normative values for the median motor nerve conduction to the pronator quadratus.
OBJECTIVE: To derive a normative database for nerve conduction values of the median nerve to the pronator quadratus using a large and varied subject population. DESIGN: Descriptive study. SETTING: Private office or university-based clinic. PARTICIPANTS: Volunteers (N=207), recruited, without risk factors for neuropathy. INTERVENTIONS: Not applicable. MAIN OUTCOME MEASURES: Onset latency, duration, amplitude, and area were recorded for all subjects. Side-to-side variability was calculated and the normative ranges were derived (97th percentile of observed values). RESULTS: Because the latencies increased with longer distances (longer forearms), the data were divided into 3 categories. The mean latency for those subjects whose distance from stimulator to recording electrode was 23 cm or less was 3.8+/-0.4 ms; the comparable values for those subjects with distances of 23.5 to 24.5 cm was 4.0+/-0.4 ms; and for those with distances of 25 cm and more, 4.5+/-0.4 ms. The amplitude and area varied with age. The mean amplitude for those subjects under 60 years of age was 4.4+/-1.8 mV, while those 60 years and over had an amplitude of 3.7+/-1.7 mV. The upper limit of normative side-to-side variability for latency was 0.6 ms, and the upper limit decrease in amplitude from 1 side to the other was 37%. CONCLUSIONS: This study establishes normative values for the median motor nerve conduction to the pronator quadratus.
Authors: Mayisha W Dunham; Sarah E James; Teresa E Lever; Qun Lu; Monica J Carrion-Jones Journal: Am J Phys Med Rehabil Date: 2009-07 Impact factor: 2.159
Authors: Phil Woo Choung; Min Young Kim; Hyung Soon Im; Ki Hoon Kim; Im Joo Rhyu; Byung Kyu Park; Dong Hwee Kim Journal: Ann Rehabil Med Date: 2016-06-29