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Diagnostic outcome of muscle biopsy
Author(s) -
Shaibani Aziz,
Jabari Duaa,
Jabbour Moussa,
Arif Chia,
Lee Minjae,
Rahbar Mohammad Hossein
Publication year - 2015
Publication title -
muscle and nerve
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.025
H-Index - 145
eISSN - 1097-4598
pISSN - 0148-639X
DOI - 10.1002/mus.24447
Subject(s) - muscle biopsy , myopathy , medicine , biopsy , weakness , electromyography , muscle weakness , receiver operating characteristic , creatine kinase , predictive value of tests , proximal muscle weakness , gold standard (test) , physical medicine and rehabilitation , surgery
: We reviewed the diagnostic yield of muscle biopsy according to the presence or absence of muscle weakness, hyperCKemia, and electromyogaphic (EMG) abnormalities. Methods : In a retrospective study, 698 muscle biopsy reports were analyzed. Logistic regression models for myopathy and specific myopathy were fit, and receiver‐operating characteristic (ROC) curves were generated to assess prediction accuracy. The probability of finding specific myopathy was considered the main indication of a positive muscle biopsy. Results : Isolated hyperCKemia was poorly predictive of either myopathy or specific myopathy. Combined myopathic EMG, proximal weakness, and hyperCKemia were predictive. The predictability increased proportionally to the creatine kinase (CK) level in patients with proximal weakness and myopathic EMG. Cross validation showed accuracy around 70% for a probability threshold of 50%. Conclusions : The presence of hyperCKemia, proximal weakness, and myopathic EMG together were associated with highly positive diagnostic outcome of muscle biopsy. Isolated hyperCKemia had a poor diagnostic yield. Muscle Nerve 51 :662–668, 2015