Reliability of SFEMG in diagnosing myasthenia gravis: Sensitivity and specificity calculated on 100 prospective cases.

Luca Padua, Amelia Evoli, Pietro Caliandro, Costanza Pazzaglia, Francesca Ciaraffa, G. Di Iasi, C. Pazzaglia

Risultato della ricerca: Contributo in rivistaArticolo in rivista

25 Citazioni (Scopus)

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 originaleEnglish
pagine (da-a)N/A-N/A
RivistaClinical Neurophysiology
DOI
Stato di pubblicazionePubblicato - 2013

Keywords

  • Myasthenia gravis
  • Neuromuscular transmission
  • Single-fibre electromyography

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