A preliminary study of the prognostic role of electromyography in laryngeal paralysis

Y B Min; E M Finnegan; H T Hoffman; E S Luschei; T M McCulloch

doi:10.1016/S0194-5998(94)70566-6

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A preliminary study of the prognostic role of electromyography in laryngeal paralysis

Journal article

Peer reviewed

A preliminary study of the prognostic role of electromyography in laryngeal paralysis

Y B Min, E M Finnegan, H T Hoffman, E S Luschei and T M McCulloch

Otolaryngology--head and neck surgery, Vol.111(6), pp.770-775

12/1994

DOI: 10.1016/S0194-5998(94)70566-6

PMID: 7991257

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Abstract

Confidence in the reliability of laryngeal electromyography to predict recovery is critical if this tool is to be used to select the type and timing of surgical intervention. The characteristics of electromyography of 14 patients with unilateral vocal fold paralysis were assessed to determine which factor or combination of factors would be most useful in determining prognosis. We examined the duration, amplitude, waveform morphology, root-mean-square, and time interval from onset to electromyography recording. The results supported the concept that electromyography recordings are valuable in determining prognosis if performed before 6 months and preferably within 6 weeks of onset of laryngeal paralysis. A positive prognosis for laryngeal recovery was indicated when the following electromyography features were present in the immobile vocal fold: (1) normal motor unit waveform morphology, (2) overall electromyography activity characterized by a root-mean-square value greater than 40 microV in any one task, and (3) no electrical silence during voluntary tasks. On the basis of this criteria our overall correct prognostic rate was 89%.

Motor Neurons - physiology

Reproducibility of Results

Prognosis

Follow-Up Studies

Humans

Reaction Time - physiology

Valsalva Maneuver

Forecasting

Muscle Relaxation - physiology

Time Factors

Muscle Contraction - physiology

Vocal Cord Paralysis - surgery

Phonetics

Signal Processing, Computer-Assisted

Laryngeal Muscles - physiopathology

Vocal Cord Paralysis - physiopathology

Electromyography - methods

Details

Title: Subtitle: A preliminary study of the prognostic role of electromyography in laryngeal paralysis
Creators: Y B Min - Department of Otolaryngology-Head and Neck Surgery, University of Iowa Hospitals and Clinics, Iowa City 52242
E M Finnegan
H T Hoffman
E S Luschei
T M McCulloch
Resource Type: Journal article
Publication Details: Otolaryngology--head and neck surgery, Vol.111(6), pp.770-775
Publisher: England
DOI: 10.1016/S0194-5998(94)70566-6
PMID: 7991257
ISSN: 0194-5998
eISSN: 1097-6817
Grant note: P60 DC00976 / NIDCD NIH HHS
Language: English
Date published: 12/1994
Academic Unit: Communication Sciences and Disorders; Radiation Oncology; Otolaryngology
Record Identifier: 9984002437902771

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