Diagnostic accuracy of thoracic paraspinal electromyography in amyotrophic lateral sclerosis.
The goal of this study was to estimate the accuracy of thoracic paraspinal (T-PSP) electromyography (EMG), performed at the time of initial evaluation, for the subsequent clinical diagnosis of amyotrophic lateral sclerosis (ALS). Medical records from a consecutive series of patients referred for suspected ALS were abstracted. Those in whom T-PSP EMG was not performed or for whom follow-up was not available were excluded. The study population included 64 patients. T-PSP EMG was abnormal in 28 (44%) study patients, 26 (93%) of whom were subsequently diagnosed with ALS. T-PSP EMG showed neither fibrillation potentials nor positive sharp waves in 36 (56%) patients, 9 (25%) of whom later developed ALS. The sensitivity of T-PSP for the diagnosis of ALS was 0.74 and the specificity was 0.93. The likelihood ratio positive was 10.5 and the likelihood ratio negative was 0.28. These results suggest that T-PSP EMG is very useful for "ruling in" the diagnosis of ALS, but less useful as a screening test for "ruling out" the diagnosis. Because T-PSP EMG is used clinically in an effort to confirm the diagnosis (and not as a screening test), these results suggest that T-PSP EMG is an extremely useful adjunct for the diagnosis of ALS.
Makki
Achraf A
AA
Department of Neurology, Emory University, Atlanta, GA 30322, USA.
Benatar
Michael
M
D000200:Action Potentials; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000690:Amyotrophic Lateral Sclerosis / Q000175:diagnosis* / Q000503:physiopathology*; D015331:Cohort Studies; D004576:Electromyography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D018482:Muscle, Skeletal / Q000503:physiopathology*; D009431:Neural Conduction; D012189:Retrospective Studies; D012680:Sensitivity and Specificity; D013909:Thorax