No abstract

Increased exposure to oxidant-derived free radicals or inadequate systems for antioxidant defense could alter cellular response at critical points in development. We measured 5 antioxidant enzymes, glutathione peroxidase (GSH-Px), glutathione reductase, glutathione-S-transferase, catalase and superoxide dismutase in erythrocytes and their plasma cofactor trace elements (Se, Zn, Cu) in 37 children with myelomeningocele and in 37 age-matched controls. We placed the patients into 3 groups according to motor level of the lesion at birth. We found significantly lower GSH-Px activities (p = 0.007) in children with myelomeningocele. For paired comparisons among the 3 patient groups and controls, there were significant differences (p < 0.05) between controls and both high (thoracic) and raid (lumbar) level embryologic lesions. The finding of antioxidant enzyme variations in our patients with myelomeningocele may indicate a role for abnormal oxidative metabolism in the development of this defect. The contribution of oxidative stress to human birth defects warrants investigation. We discuss potential relationships between oxidative stress and energy metabolism during primary neurulation.

I believe meningomyelocele is not vanishing, but is a new and diminishing disorder. Prenatal diagnosis will be accepted only by a portion of most communities if abortion is the only alternative to the delivery of an impaired child. I believe participation in neural tube screening programmes can be increased by offering improved pregnancy outcome with concomitant prelabor caesarean section in addition to termination. Regardless, the prevalence at birth of children with myelomeningocele will decrease both in total numbers and in the severity of the expressed lesion. The resultant rarity will require collaboration between centers to evaluate treatment. The developing International Myelodysplasia Study Group using a Patient Data Management System and computer-assisted analysis is a model of successful collaboration that allows better exploration of the multiple variables that contribute to the well-being of children with open neural tube defects of the spine.