Cen Z.,Zhejiang UniversityHangzhou Zhejiang |
Huang C.,Hangzhou Center for Disease Control and PreventionHangzhou |
Yin H.,Zhejiang UniversityHangzhou Zhejiang |
Ding X.,Zhejiang UniversityHangzhou Zhejiang |
And 9 more authors.
Movement Disorders | Year: 2016
Objective: Familial cortical myoclonic tremor with epilepsy is a rare epilepsy syndrome. Herein, we report on nine Chinese familial cortical myoclonic tremor with epilepsy pedigrees to delineate its clinical and neurophysiological features. Methods: Detailed clinical and neurophysiological data were obtained. Somatosensory evoked potential amplitudes and clinical profile were analyzed using multilevel statistical models. Age-at-onset anticipation was analyzed using Kaplan-Meier survival analysis. Results: Fifty-five patients were interviewed directly, whose mean age at onset of cortical tremor and generalized tonic-clonic seizures were 31.0±8.3 and 36.0±7.9 years. Giant somatosensory evoked potential was detected in 87.5% (28 of 32) of patients, and long-latency cortical reflex was detected in 93.5% (29 of 31). Cortical tremor severity was significantly higher in patients with longer disease duration of cortical tremor (P=0.0061). Somatosensory evoked potential amplitudes were significant higher in patients with higher level of cortical tremor severity (P=0.0003) and those using antiepileptic drugs (P=0.0150). Age-at-onset anticipation of cortical tremor with paternal transmission was found with statistical significance (P=0.022). Conclusion: We provided the clinical and neurophysiological features of familial cortical myoclonic tremor with epilepsy patients. This study is reported for the presentation of this rare disease in a Chinese population with the largest single report on familial cortical myoclonic tremor with epilepsy worldwide. Age-at-onset anticipation of cortical tremor with paternal transmission was statistically significant, which further confirmed a possibility of unstable expanding repeat in the genetic mechanism of familial cortical myoclonic tremor with epilepsy. © 2016 International Parkinson and Movement Disorder Society.