title: Can we accurately measure the onset latency to the first dorsal interosseous?
abstract: We present two cases with and without a latency difference of the compound muscle action potential (CMAP) from the abductor digiti minimi (ADM) and the first dorsal interosseous (FDI). In each case, onset latencies of FDI CMAPs using the contralateral small finger as E2 were shorter than those of belly-tendon CMAPs from the ADM and FDI. We conclude that onset of the belly-tendon FDI CMAP does not necessarily indicate initial activation of the FDI.
authors.affiliation: Department of Rehabilitation Medicine, University of Washington School of Medicine, Box 356380, 1959 NE Pacific Street, Seattle, Washington 98195, USA. nobushige-t@umin.ac.jp
authors.forename: Nobushige
authors.initials: N
authors.lastname: Takahashi
authors.forename: Lawrence R
authors.initials: LR
authors.lastname: Robinson
mesh_terms: D000200:Action Potentials / Q000502:physiology*; D000328:Adult; D004576:Electromyography / Q000379:methods*; D006225:Hand / Q000294:innervation / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D018482:Muscle, Skeletal / Q000294:innervation / Q000502:physiology*; D011930:Reaction Time / Q000502:physiology*; D014459:Ulnar Nerve / Q000502:physiology*; D020424:Ulnar Neuropathies / Q000175:diagnosis / Q000503:physiopathology