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Potentially asphyxiating conditions and spastic cerebral palsy in infants of normal birth weight
1Neuroepidemiology Branch, National Institute of Neurological Disorders and Stroke, Bethesda, Maryland, USA.
Insights
Tight nuchal cords were linked to unexplained spastic quadriplegia, a severe form of cerebral palsy. This association was not observed for other types of cerebral palsy, indicating specific risk factors for different subtypes.
Area of Science:
- Obstetrics and Gynecology
- Pediatrics
- Neurology
Background:
- Cerebral palsy (CP) is a group of disorders affecting movement and posture, with various potential causes.
- Understanding the role of intrapartum events in CP pathogenesis is crucial for prevention strategies.
Purpose of the Study:
- To investigate the association between conditions interrupting fetal oxygen supply and cerebral palsy.
- Specifically, to determine if asphyxiating events are linked to unexplained spastic CP.
Main Methods:
- A population-based case-control study was conducted in California.
- Birth records of 46 children with spastic CP and 378 controls were compared.
- Focus was on children without recognized prenatal brain lesions.
Main Results:
- Tight nuchal cord was significantly associated with unexplained spastic quadriplegia (OR 18).
- This association was specific to quadriplegia, not diplegia or hemiplegia.
- Intrapartum indicators of fetal stress did not differentiate affected children from controls.
Conclusions:
- Potentially asphyxiating conditions, particularly tight nuchal cord, contribute to a subset of unexplained spastic quadriplegia.
- The findings highlight the importance of specific intrapartum events in the etiology of certain CP subtypes.
- Intrapartum abnormalities alone were not sufficient to distinguish CP cases.
Objective:
Our purpose was to examine the association of cerebral palsy with conditions that can interrupt oxygen supply to the fetus as a primary pathogenetic event.
Study Design:
A population-based case-control study was performed in four California counties, 1983 through 1985, comparing birth records of 46 children with disabling spastic cerebral palsy without recognized prenatal brain lesions and 378 randomly selected control children weighing > or = 2500 g at birth and surviving to age 3 years.
Results:
Eight of 46 children with otherwise unexplained spastic cerebral palsy, all eight with quadriplegic cerebral palsy, and 15 of 378 controls had births complicated by tight nuchal cord (odds ratio for quadriplegia 18, 95% confidence interval 6.2 to 48). Other potentially asphyxiating conditions were uncommon and none was associated with spastic diplegia or hemiplegia. Level of care, oxytocin for augmentation of labor, and surgical delivery did not alter the association of potentially asphyxiating conditions with spastic quadriplegia. Intrapartum indicators of fetal stress, including meconium in amniotic fluid and fetal monitoring abnormalities, were common and did not distinguish children with quadriplegia who had potentially asphyxiating conditions from controls with such conditions.
Conclusion:
Potentially asphyxiating conditions, chiefly tight nuchal cord, were associated with an appreciable proportion of unexplained spastic quadriplegia but not with diplegia or hemiplegia. Intrapartum abnormalities were common both in children with cerebral palsy and controls and did not distinguish between them.