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Related Experiment Videos

Laryngeal electromyography: technical features.

A N Crespo1, P A T Kimaid, E M A B Quagliato

  • 1Service of Otorhinolaryngology, UNICAMP School of Medicine, UNICAMP, Brazil.

Electromyography and Clinical Neurophysiology
|July 1, 2004
PubMed
Summary
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Laryngeal electromyography (LEMG) aids in diagnosing neurological disorders affecting voice. This study details techniques for inserting electrodes into key laryngeal muscles, noting challenges with specific approaches.

Area of Science:

  • Neurology
  • Otorhinolaryngology
  • Speech and Hearing Sciences

Background:

  • Laryngeal electromyography (LEMG) is crucial for diagnosing neurological conditions impacting laryngeal function.
  • Percutaneous needle electrode insertion, guided by surface anatomy, is the standard LEMG technique.

Purpose of the Study:

  • To describe specific needle electrode insertion techniques for thyroarytenoid (TA), cricothyroid (CT), lateral cricoarytenoid (CAL), and posterior cricoarytenoid (CAP) muscles.
  • To discuss challenges encountered during LEMG procedures and propose solutions.

Main Methods:

  • Detailed description of LEMG electrode insertion techniques for TA, CT, CAL, and CAP muscles.
  • Pre-LEMG assessments included otorhinolaryngological exams, speech-language pathology evaluations, and laryngeal endoscopy.

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Main Results:

  • The posterior cricoarytenoid (CAP) muscle approach was the most challenging, followed by the lateral cricoarytenoid (CAL).
  • Thyroarytenoid (TA) and cricothyroid (CT) muscle approaches were generally straightforward, with minor difficulties in older or obese patients.
  • A rare complication of hematoma occurred during a TA approach, partially obstructing the airway.

Conclusions:

  • LEMG electrode placement techniques for laryngeal muscles are described, highlighting procedural variations and potential difficulties.
  • Understanding and addressing challenges in LEMG, such as difficult muscle access and potential complications, is vital for accurate diagnosis.