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Clinical, electrophysiologic, and imaging features of zoster-associated limb paresis
Lyell K Jones1, Haatem Reda, James C Watson
1Department of Neurology, Mayo Clinic, Rochester, 200 First Street SW, Minnesota, 55905, USA.
Introduction:
Paresis is a long-recognized complication of herpes zoster, but there has been comparatively little study of zoster-associated limb paresis (ZALP).
Methods:
In this study we reviewed 49 Mayo Clinic patients with ZALP.
Results:
The mean age of onset was 71 years, 67% were men, and the lower limb was affected in 55%. The mean weakness score was 2.0 (0 = normal strength, 4 = plegia). Most patients developed postherpetic neuralgia (PHN, 92% at 1 month and 65% at 3 months), and the average minimum duration of weakness was 193 days. ZALP was caused by radiculopathy (37%), plexopathy (41%), mononeuropathy (14%), and radiculoplexus neuropathy (8%). MRI demonstrated nerve enlargement, T2 signal prolongation, or enhancement in a majority (64%) of affected plexi and peripheral nerves.
Conclusions:
ZALP is associated with considerable weakness. It typically lasts at least several months, localizes to plexus or peripheral nerve in 63%, and is associated with high rates of PHN.
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