Risk Factors for Term-Born Periventricular White Matter Injury in Children With Cerebral Palsy: A Case-Control Study.

OBJECTIVE

The aim of this study was to identify possible risk factors associated with term-born children with cerebral palsy (CP) and periventricular white matter injury (PVWMI) on imaging.

METHODS

This is a case-controlled study restricted to term-born children with CP with the cases extracted from the Canadian Cerebral Palsy Registry and controls from Alberta Pregnancy Outcomes and Nutrition (APrON) study. A diagnosis of PVWMI was performed based on expert categorization of MRI reports. Risk factor variables were selected a priori; these included pregnancy complications, antenatal toxin exposure, perinatal infection, sex, small for gestational age, and perinatal adversity (i.e., neonatal encephalopathy presumably on the basis of intrapartum hypoxia-ischemia). We used multivariable analyses to calculate odds ratios (ORs) and their 95% CIs.

RESULTS

A total of 160 cases (7.06% of the registry sample) were compared with 1,950 controls. Of the term-born PVWMI participants, 59.4% were male and 13.5% were born to mothers of extreme maternal age. Multivariable analysis of each risk factor controlled for weight showed PVWMI is associated with pregnancy complications (OR = 3.35; 95% CI = 2.23-4.94), antenatal toxin exposure (OR = 2.45; 95% CI = 1.67-3.55), perinatal infection (OR = 3.61; 95% CI = 1.96-6.29), and perinatal adversity (OR = 2.03; 95% CI = 1.42-2.94). Term-born male participants were not more likely to experience PVWMI compared with female participants (OR = 1.37; 95% CI = 0.98-1.93). Multiple regression analyses suggested independent associations between PVWMI and pregnancy complications (OR = 3.75; 95% CI 2.46-5.62), antenatal toxin exposure (OR = 2.80; 95% CI 1.88-4.12), perinatal infection (OR = 4.62; 95% CI 2.46-8.42), and perinatal adversity (OR = 2.49; 95% CI = 1.71-3.69).

DISCUSSION

Risk factors such as pregnancy complications, antenatal toxin exposure, perinatal infection, and perinatal adversity are associated with PVWMI in term-born children, suggesting perhaps variable interactions between antenatal and perinatal factors to yield this under-recognized CP phenotype.