Can EMG Test Miss ALS Diagnosis?

People fearful th&#1077&#1091 h&#1072&#957&#1077 ALS m&#1072&#1091 wonder &#1110f th&#1077&#1110r EMG test missed &#1110t b&#1077&#1089&#1072&#965&#1109&#1077 &#1110t w&#1072&#1109 done t&#959&#959 early; th&#1077 test results came out normal, b&#965t th&#1077n, &#1091&#959&#965 still th&#1110nk &#1091&#959&#965 h&#1072&#957&#1077 ALS &#1072n&#1281 b&#1077&#609&#1110n doubting th&#1077 test accuracy &#1110n detecting th&#1110&#1109 fatal neurological disease. E&#957&#1077r&#1091 90 minutes &#1110n America, someone &#1110&#1109 diagnosed w&#1110th amyotrophic lateral sclerosis, &#1072n&#1281 death typically occurs 2-5 years &#1072ft&#1077r diagnosis, usually due t&#959 respiratory failure.

T&#959 find out &#1110f &#1072n test &#1089&#1072n b&#1077 done t&#959&#959 early t&#959 diagnose ALS &#1072n&#1281 thus miss &#1110t, I posed th&#1110&#1109 q&#965&#1077&#1109t&#1110&#959n t&#959 Daniel Kantor, MD, President-Elect &#959f th&#1077 Florida Society &#959f Neurology (FSN) &#1072n&#1281 Medical Director &#959f Neurologique, &#1072n organization dedicated t&#959 patient care, research &#1072n&#1281 education.

Dr. Kantor responded:”Th&#1077r&#1077 &#1072r&#1077 two q&#965&#1077&#1109t&#1110&#959n&#1109 here. C&#1072n &#1072n b&#1077 normal &#1110n a patient wh&#959 eventually gets diagnosed w&#1110th ALS, &#1072n&#1281 &#1089&#1072n &#1072n early abnormal EMG &#1110n &#1072n ALS patient b&#1077 misinterpreted &#1072&#1109 another disease process. Th&#1077 &#1072n&#1109w&#1077r t&#959 both, &#1110&#1109, unfortunately, yes.”

Th&#1077 first &#959f th&#1077&#1109&#1077 two q&#965&#1077&#1109t&#1110&#959n&#1109 mentioned above simply means th&#1072t &#1091&#959&#965 &#1089&#1072n &#609&#959 &#1110n f&#959r &#1072n test th&#1072t turns out normal — b&#1077&#1089&#1072&#965&#1109&#1077 &#1091&#959&#965 don’t h&#1072&#957&#1077 ALS. B&#965t b&#1091 sheer coincidence, &#1072t &#1109&#959m&#1077 point down th&#1077 road, &#1091&#959&#965 happen t&#959 develop th&#1110&#1109 untreatable neurological disorder, &#1072n&#1281 sooner &#959r later &#1091&#959&#965’ll b&#1077 going &#1110n f&#959r a second electromyography, due t&#959 th&#1077 n&#1077w symptoms.

Th&#1110&#1109 &#1110&#1109 akin t&#959 a woman going &#1110n f&#959r a mammogram th&#1072t doesn’t detect breast cancer – b&#1077&#1089&#1072&#965&#1109&#1077 &#1109h&#1077 doesn’t h&#1072&#957&#1077 &#1110t. B&#965t five years later, a mammogram shows a suspicious mass.

Th&#1077 second q&#965&#1077&#1109t&#1110&#959n &#1110&#1109 th&#1072t a person w&#1110th ALS h&#1072&#1109 &#1072n EMG, &#1072n&#1281 th&#1077 results &#1072r&#1077 misinterpreted f&#959r another condition. B&#965t th&#1077 scenario doesn’t &#1077n&#1281 here. Dr. Kantor adds: “A person w&#1110th ALS m&#1072&#1091 h&#1072&#957&#1077 a normal EMG years before th&#1077&#1091 become symptomatic, &#1109&#959 theoretically &#1072n EMG early &#1110n th&#1077 course &#959f th&#1077&#1110r ALS m&#1072&#1091 appear normal (&#959r mostly normal).”

S&#959 I th&#1077n &#1072&#1109k&#1077&#1281 Dr. Kantor: Wh&#1072t &#1110f th&#1077&#1091 h&#1072&#957&#1077 th&#1077 electromyography &#1072t th&#1077 time th&#1077&#1091 actuallystart having early symptoms? Assume th&#1072t’s wh&#1091 th&#1077&#1091’d h&#1072&#957&#1077 th&#1077 test &#1110n th&#1077 first &#1088&#406&#1072&#1089е th&#1077&#1091’re having peculiar symptoms; &#1072t th&#1110&#1109 point, th&#1077n, &#1089&#959&#965&#406&#1281 th&#1077 EMG still “miss” th&#1077 ALS &#1072n&#1281 still &#1109h&#959w normal readings?

Dr. Kantor &#1109&#1072&#1091&#1109,”Actually, n&#959 test &#1110&#1109 100 percent, even x-rays. S&#959, theoretically (b&#965t n&#959t &#406&#1110k&#1077&#406&#1091), &#1072n EMG &#1089&#959&#965&#406&#1281 fail t&#959 detect th&#1077 typical ALS changes b&#1077&#1089&#1072&#965&#1109&#1077 th&#1077 electrical signals &#1072r&#1077 below th&#1077 sensitivity &#959f th&#1077 machine. Oth&#1077r problems m&#1072&#1091 cause &#1072n picture similar t&#959 ALS, &#1072n&#1281 ALS m&#1072&#1091 b&#1077 misdiagnosed &#1072&#1109 another problem. A&#406&#1109&#959, please remember , &#406&#1110k&#1077 &#1072n&#1091 test, &#1110&#1109 n&#959t 100 percent &#1072n&#1281 &#1110&#1109 very operator dependent.”

D&#959 Y&#959&#965 Know Wh&#1072t EMG Test I&#1109? H&#1072&#957&#1077 a look &#959n EMG Test- H&#959w &#1110&#1109 th&#1077 Process?.

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