Brain, Vol. 123, No. 4, 718-723,
April 2000
© 2000 Oxford University Press
The natural history of hereditary neuralgic amyotrophy in the Dutch population
Two distinct types?
1 Neuromuscular Centre Nijmegen, Institute of Neurology and 2 Department of Human Genetics, University Hospital Nijmegen, The Netherlands
Correspondence to:
B. G. M. van Engelen, MD, Neuromuscular Centre Nijmegen, Institute of Neurology, University Hospital Nijmegen, PO Box 9101, 6500 HB Nijmegen, The Netherlands E-mail: B.vanEngelen{at}czzoneu.azn.nl
On investigation of 101 attacks in 24 patients with hereditary neuralgic amyotrophy (HNA) from nine different families, we found that HNA can run two distinct courses: a `classic' relapsingremitting and a chronic undulating type with exacerbations. Only one type occurred per family, suggesting genetic heterogeneity. This is supported by the finding that only in a family with `classic type' HNA are data of linkage analysis compatible with linkage to the 17q24q25 interval which harbours a locus for the disease. The average number of attacks per patient during a follow-up of 26 years was four in the classic form of HNA and five in the chronic undulating type. All patients suffered from residual symptoms on follow-up, with a median Rankin score of 2 in both groups, showing that long-term prognosis is less favourable than previously reported.
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