Abstract
Objective
The study aimed to determine the utility of single-fibre electromyography (SFEMG) in the diagnosis of myasthenia gravis (MG) in subjects with a clinical suspicion of the disease.
Methods
We performed a prospective, single-blinded study on 100 consecutive patients. SFEMG was not considered a criterion in making the MG diagnosis. For all cases, a different physician than the one performing SFEMG made the diagnosis of MG. All subjects underwent standard SFEMG of a single muscle, the orbicularis oculi.
Results
SFEMG was abnormal in 67 of 100 patients. A final diagnosis of definite MG was made in 54 patients (30 men/24 women). SFEMG was positive in 53 of 54 patients diagnosed with MG. The sensitivity of SFEMG in diagnosing MG was 98% (95% CI: 0.94–1.02), while the specificity was 70% (95% CI: 0.54–0.86), with a positive predictive value of 79% (95% CI: 0.74–0.79) and a negative predictive value of 97% (95% CI: 0.94–0.99).
Conclusions
In this cohort of patients, normal SFEMG findings were unlikely to occur in patients with MG.
Lingua originale | English |
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pagine (da-a) | N/A-N/A |
Rivista | Clinical Neurophysiology |
DOI | |
Stato di pubblicazione | Pubblicato - 2013 |
Keywords
- Myasthenia gravis
- Neuromuscular transmission
- Single-fibre electromyography