title: Prolongation of F-wave minimal latency: a sensitive predictor of polyneuropathy.
abstract: BACKGROUND
  To evaluate the sensitivity of F-wave minimal latencies, we compared F-waves with motor and sensory nerve conduction studies (MNCS and SNCS) in patients with peripheral neuropathy.
  
  
  METHODS
  A retrospective chart review conducted in 484 patients confirmed the clinical evidence of a polyneuropathy, and studies of F-wave minimal latencies as well as MNCS and SNCS in each patient.
  
  
  RESULTS
  Overall rate of abnormality reached 469/484 (96.9%) for F-wave minimal latencies as compared to 374/484 (77%) for nerve conduction studies ( p < 0.0001). Nerve-specific abnormalities of F-waves showed 290/354 (82%), 140/171 (82%), 367/398 (92%) and 357/376 (95%) for median, ulnar, peroneal and tibial nerves, respectively. Corresponding values for MNCS consisted of 108/354 (31%), 29/171 (17%), 258/398 (65%) and 189/376 (50%) (all p < 0.0001). In contrast, SNCS revealed abnormalities in 120/333 (36%), 60/159 (38%) and 266/474 (56%) of median, ulnar and sural nerves.
  
  
  CONCLUSIONS
  F-wave minimal latencies serve as the best predictor of polyneuropathy followed by SNCS and then MNCS.
authors.affiliation: a Department of Neurology , Carver College of Medicine, The University of Iowa , Iowa City , IA , USA.|b Iowa City Veterans Affair Medical Center , Iowa City , IA , USA.
authors.forename: Nivedita Uberoi
authors.initials: NU
authors.lastname: Jerath
authors.affiliation: a Department of Neurology , Carver College of Medicine, The University of Iowa , Iowa City , IA , USA.|b Iowa City Veterans Affair Medical Center , Iowa City , IA , USA.
authors.forename: Edward
authors.initials: E
authors.lastname: Aul
authors.affiliation: c Department of Neurosurgery , The University of Iowa , Iowa City , IA , USA.
authors.forename: Chandan G
authors.initials: CG
authors.lastname: Reddy
authors.affiliation: d Department of Physiotherapy, School of Rehabilitation Sciences , Isfahan University of Medical Sciences , Isfahan , Iran.
authors.forename: Hamid
authors.initials: H
authors.lastname: Azadeh
authors.affiliation: a Department of Neurology , Carver College of Medicine, The University of Iowa , Iowa City , IA , USA.|b Iowa City Veterans Affair Medical Center , Iowa City , IA , USA.
authors.forename: Andrea
authors.initials: A
authors.lastname: Swenson
authors.affiliation: a Department of Neurology , Carver College of Medicine, The University of Iowa , Iowa City , IA , USA.
authors.forename: Jun
authors.initials: J
authors.lastname: Kimura
keywords: F-wave minimal latency; height-latency nomogram; nerve conduction studies; peripheral neuropathy; polyneuropathy