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Journal of Child Neurology
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Follow-up Study of Muscle Function in Children of Mothers With Myasthenia Gravis During Pregnancy

Gunnar Ahlsten, MD, PhD

Department of Pediatrics, University Hospital, Uppsala

Ann-Kari Lefvert, MD, PhD

Department of Internal Medicine Karolinska Hospital, Stockholm, Sweden

Per-Olof Osterman, MD, PhD

Department of Neurology, University Hospital, Uppsala

Erik Stalberg, MD, PhD

Department of Clinical Neurophysiology, University Hospital, Uppsala

Jan Säfwenberg, MD, PhD

Department of Immunology University Hospital, Uppsala

Most infants whose mothers have myasthenia gravis are healthy at birth, but 10% to 15% have a transient neonatal form of myasthenia gravis. In this study, the muscular function and neuromuscular transmission were examined in 31 children, aged 3 months to 31 years (median, 10 years), of 15 myasthenic mothers. Eleven of these children had had the neonatal form of myasthenia gravis. The children were examined clinically and with neurophysiologic methods. Blood samples were taken for HLA typing, creatine kinase levels, and myoglobin and acetylcholine receptor antibody studies. Twenty-nine of the 31 children had no signs of neuromuscular disease. Two children (who had had neonatal myasthenia gravis) had a moderate stationary myopathy, probably unrelated to the myasthenia gravis of their mother. Creatine kinase levels were normal for all subjects. Acetylcholine receptor antibody levels were similar to those of a control population. The HLA type B8 antigen was not significantly more prevalent in the children who had had neonatal myasthenia gravis than in the healthy children. Neonatal myasthenia gravis in a previous sibling was the only factor in the material that predicted the occurrence of myasthenic symptoms in the neonatal period. (J Child Neurol 1992;7:264-269).

Journal of Child Neurology, Vol. 7, No. 3, 264-269 (1992)
DOI: 10.1177/088307389200700305
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