Diagnosis of zygomaticus muscle paralysis using needle electromyography with ultrasonography

Seung Han Yoo, Hee Kyu Kwon, Sang Heon Lee, Seok Jun Lee, Kang Wook Ha, Hyeong Suk Yun

Research output: Contribution to journalArticle

Abstract

A 22-year-old woman visited our clinic with a history of radiofrequency volumetric reduction for bilateral masseter muscles at a local medical clinic. Six days after the radiofrequency procedure, she noticed a facial asymmetry during smiling. Physical examination revealed immobility of the mouth drawing upward and laterally on the left. Routine nerve conduction studies and needle electromyography (EMG) in facial muscles did not suggest electrodiagnostic abnormalities. We assumed that the cause of facial asymmetry could be due to an injury of zygomaticus muscles, however, since defining the muscles through surface anatomy was difficult and it was not possible to identify the muscles with conventional electromyographic methods. Sono-guided needle EMG for zygomaticus muscle revealed spontaneous activities at rest and small amplitude motor unit potentials with reduced recruitment patterns on volition. Sono-guided needle EMG may be an optimal approach in focal facial nerve branch injury for the specific localization of the injury lesion.

Original languageEnglish
Pages (from-to)433-437
Number of pages5
JournalAnnals of Rehabilitation Medicine
Volume37
Issue number3
DOIs
Publication statusPublished - 2013 Aug 21

Fingerprint

Electromyography
Paralysis
Needles
Ultrasonography
Facial Asymmetry
Muscles
Facial Nerve Injuries
Smiling
Facial Muscles
Masseter Muscle
Neural Conduction
Wounds and Injuries
Physical Examination
Mouth
Anatomy

Keywords

  • Needle electromyography
  • Ultrasonography-guided
  • Zygomaticus

ASJC Scopus subject areas

  • Rehabilitation

Cite this

Diagnosis of zygomaticus muscle paralysis using needle electromyography with ultrasonography. / Yoo, Seung Han; Kwon, Hee Kyu; Lee, Sang Heon; Lee, Seok Jun; Ha, Kang Wook; Yun, Hyeong Suk.

In: Annals of Rehabilitation Medicine, Vol. 37, No. 3, 21.08.2013, p. 433-437.

Research output: Contribution to journalArticle

Yoo, Seung Han ; Kwon, Hee Kyu ; Lee, Sang Heon ; Lee, Seok Jun ; Ha, Kang Wook ; Yun, Hyeong Suk. / Diagnosis of zygomaticus muscle paralysis using needle electromyography with ultrasonography. In: Annals of Rehabilitation Medicine. 2013 ; Vol. 37, No. 3. pp. 433-437.
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