TY - JOUR
T1 - Amiodarone-induced neuromyopathy
T2 - Three cases and a review of the literature
AU - Pulipaka, Uma
AU - Lacomis, David
AU - Omalu, Bennet
PY - 2002
Y1 - 2002
N2 - Objectives: To better characterize the clinical, electrodiagnostic, and pathologic aspects of amiodarone-induced neuromyopathy. Methods: We reviewed medical records, performed electrodiagnostic studies, and examined histopathologic specimens of muscle and nerve in three patients with amiodarone-induced neuromuscular toxicity, as well as summarized the relevant literature. Results: Two patients had a slightly asymmetric, mixed, but primarily demyelinating sensorimotor polyneuropathy. One also had a substantial myopathy. The third had an acute neuropathy resembling Guillain-Barré syndrome. Seemingly, creatine kinase levels did not correlate with clinical or electromyographic evidence of myopathy. Histologic evaluations of peripheral nerves revealed demyelination, some axon loss, and a variable number of characteristic lysosomal inclusions. Muscle specimens from two patients showed evidence of a vacuolar myopathy. After discontinuation of amiodarone, two patients improved and one died of cardiac arrhythmia. Conclusions: Although the clinical features and onset times vary, amiodarone neuromuscular toxicity manifests as a mixed polyneuropathy, vacuolar myopathy, or both. Creatine kinase levels may not correlate with the degree of myopathy. Variable numbers of lysosomal inclusions in peripheral nerve, endothelial cells, and muscle are characteristic.
AB - Objectives: To better characterize the clinical, electrodiagnostic, and pathologic aspects of amiodarone-induced neuromyopathy. Methods: We reviewed medical records, performed electrodiagnostic studies, and examined histopathologic specimens of muscle and nerve in three patients with amiodarone-induced neuromuscular toxicity, as well as summarized the relevant literature. Results: Two patients had a slightly asymmetric, mixed, but primarily demyelinating sensorimotor polyneuropathy. One also had a substantial myopathy. The third had an acute neuropathy resembling Guillain-Barré syndrome. Seemingly, creatine kinase levels did not correlate with clinical or electromyographic evidence of myopathy. Histologic evaluations of peripheral nerves revealed demyelination, some axon loss, and a variable number of characteristic lysosomal inclusions. Muscle specimens from two patients showed evidence of a vacuolar myopathy. After discontinuation of amiodarone, two patients improved and one died of cardiac arrhythmia. Conclusions: Although the clinical features and onset times vary, amiodarone neuromuscular toxicity manifests as a mixed polyneuropathy, vacuolar myopathy, or both. Creatine kinase levels may not correlate with the degree of myopathy. Variable numbers of lysosomal inclusions in peripheral nerve, endothelial cells, and muscle are characteristic.
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U2 - 10.1097/00131402-200203000-00001
DO - 10.1097/00131402-200203000-00001
M3 - Article
C2 - 19078662
AN - SCOPUS:0036196584
SN - 1522-0443
VL - 3
SP - 97
EP - 105
JO - Journal of Clinical Neuromuscular Disease
JF - Journal of Clinical Neuromuscular Disease
IS - 3
ER -