title: Muscle action potential scans and ultrasound imaging in neurofibromatosis type 2.
abstract: The neuropathy in patients with neurofibromatosis type 2 (NF2) is difficult to quantify and follow up. In this study we compared 3 methods that may help assess motor axon pathology in NF2 patients.
  
  
  
  Nerve conduction studies in median nerves were supplemented by deriving motor unit number estimates (MUNEs) from compound muscle action potential (CMAP) scans and by high-resolution ultrasound (US) peripheral nerve imaging.
  
  
  
  CMAP amplitudes and nerve conduction velocity were normal in the vast majority of affected individuals, but CMAP scan MUNE revealed denervation and reinnervation in many peripheral nerves. In addition, nerve US imaging enabled monitoring of the size and number of schwannoma-like fascicular enlargements in median nerve trunks.
  
  
  
  In contrast to conventional nerve conduction studies, CMAP scan MUNE in combination with US nerve imaging can quantify the NF2-associated neuropathy and may help to monitor disease progression and drug treatments. Muscle Nerve 55: 350-358, 2017.
authors.affiliation: Department of Neurology, University Medical Centre Hamburg-Eppendorf Hospital, Hamburg, Germany.
authors.forename: Said
authors.initials: S
authors.lastname: Farschtschi
authors.affiliation: Department of Neurology, University Medical Centre Hamburg-Eppendorf Hospital, Hamburg, Germany.
authors.forename: Mathias
authors.initials: M
authors.lastname: Gelderblom
authors.affiliation: Department of Neurology, University Medical Centre Hamburg-Eppendorf Hospital, Hamburg, Germany.
authors.forename: Sabriena
authors.initials: S
authors.lastname: Buschbaum
authors.affiliation: Sobell Department of Motor Neuroscience and Movement Disorders, Institute of Neurology, University College London, London, UK.
authors.forename: Hugh
authors.initials: H
authors.lastname: Bostock
authors.affiliation: Physiological Genomics, Institute of Physiology, Ludwig-Maximilians University Munich, Pettenkoferstrasse 12, 80336, Munich, Germany.
authors.forename: Peter
authors.initials: P
authors.lastname: Grafe
authors.affiliation: Department of Neurology, University Medical Centre Hamburg-Eppendorf Hospital, Hamburg, Germany.
authors.forename: Victor F
authors.initials: VF
authors.lastname: Mautner
mesh_terms: D000200:Action Potentials / Q000502:physiology*; D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D004594:Electrophysiology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009046:Motor Neurons / Q000502:physiology; D018482:Muscle, Skeletal / Q000000981:diagnostic imaging* / Q000503:physiopathology*; D009431:Neural Conduction / Q000502:physiology; D016518:Neurofibromatosis 2 / Q000150:complications / Q000000981:diagnostic imaging* / Q000473:pathology*; D010525:Peripheral Nerves / Q000000981:diagnostic imaging; D014463:Ultrasonography; D055815:Young Adult
keywords: MUNE; denervation; neurofibromatosis type 2; neuropathy; reinnervation; ultrasound nerve imaging