This study assessed the utility of clinical electromyography (EMG) for detecting lower motor neuron (LMN) or upper motor neuron (UMN) dysfunction affecting the intrinsic muscles of the larynx and pharynx. Twenty-nine subjects were examined; their clinical diagnoses included perioperative nerve injury, cerebral infarction, and lateral medullary infarction. Resting activity, motor unit action potential (MUAP) morphology, and MUAP recruitment were evaluated in every case. Medical records (excluding EMG data) were analyzed for clinical evidence of LMN or UMN dysfunction in the intrinsic muscles of the larynx and pharynx. The diagnosis of LMN dysfunction rested on clinical data consistent with cranial nerve injury, poliomyelitis, Wallenberg syndrome, or unilateral bulbar palsy. Criteria for UMN dysfunction included previous cerebral (not brainstem) infarction or mass lesion or the presence of hemiparesis. Electromyographic abnormalities were significantly associated with LMN dysfunction (p < .05), but they were not significantly associated with UMN dysfunction. Of the parameters tested, MUAP recruitment was the most sensitive (82%) and specific (92%).
|Original language||English (US)|
|Number of pages||5|
|Journal||Archives of physical medicine and rehabilitation|
|State||Published - Mar 1991|
- Nervous system
ASJC Scopus subject areas
- Physical Therapy, Sports Therapy and Rehabilitation