Spastic cerebral palsy: changes in birthweight and gestational age

Area of Science:

• Neurology
• Pediatrics
• Public Health

Background:

• Cerebral palsy (CP) is a significant developmental disorder.
• Understanding risk factors like birthweight and gestational age is crucial for prevention and intervention.
• Trends in CP subtypes may reflect changes in neonatal care and obstetric practices.

Purpose of the Study:

• To analyze birthweight and gestational age distributions for spastic cerebral palsy cases.
• To investigate changes in CP rates among different birthweight categories following neonatal intensive care advancements.
• To identify distinct patterns for spastic diplegia, hemiplegia, and quadriplegia.

Main Methods:

• Utilized data from the Western Australian CP register.
• Compared frequency distributions of birthweight and gestational age for spastic CP cases and controls.
• Analyzed trends between 1961-1965 and 1971-1975.

Main Results:

• Spastic CP rates decreased in heavier infants (>=2500g) but remained steady or increased in low birthweight (LBW: <2500g) infants post-neonatal intensive care introduction.
• Spastic diplegia exhibited bimodal distributions for birthweight (peaks at 1500g and 3000g) and gestational age (peaks at 31 and 39 weeks).
• A decline in heavier, term diplegics was observed, with a proportional increase in preterm LBW diplegics; spastic hemiplegic and quadriplegic cases showed increased rates of small for gestational age (SGA).

Conclusions:

• Advancements in neonatal intensive care have impacted CP rates differently across birthweight categories.
• Spastic diplegia's distinct distributional patterns suggest specific etiological factors.
• Intrauterine factors appear significant for spastic hemiplegic and quadriplegic CP, particularly in SGA infants.