Incidence Estimates of Perinatal Arterial Ischemic Stroke in Preterm- and Term-Born Infants: A National Capture-Recapture Calculation Corrected Surveillance Study

<b><i>Introduction:</i></b> Data on valid incidence estimates of perinatal arterial ischemic stroke (PAIS) are scarce. This analysis aims to determine incidence of PAIS in term- and preterm-born infants and to investigate clinical differences related to prematurity. <b><i>Methods:</i></b> This surveillance study (2015–2017) in all German paediatric hospital estimated incidences for MRI-confirmed PAIS in term and preterm infants. To correct for under-reporting, we performed capture-recapture-calculations (CRC) in the most populous federal state and extrapolated nationwide. Differences in clinical presentation in term- and preterm-born infants were assessed. <b><i>Results:</i></b> 126 term- and 19 preterm-born infants with PAIS were reported. CRC corrected incidence of PAIS was 22 (95% confidence interval [CI] 17, 27) per 100,000 live births. Stratified by prematurity, the incidence was 32 (95% CI 15, 49) per 100,000 in preterm-born infants and 21 (95% CI 16, 26) per 100,000 term-born infants (significant difference <i>p</i> = 0.001). In symptomatic cases only (<i>n</i> = 120 term born, <i>n</i> = 12 preterm born), incidences did not differ. Risk factor patterns were similar, but number of risk factors in preterm babies was elevated (mean 3.8 vs. 2.9; <i>p</i> = 0.01) and median age at diagnosis was increased (5 vs. 3 days; <i>p</i> = 0.04). Clinical seizures were observed in 88% (106/120) of symptomatic term infants compared to 33% (4/12) in preterm-born infants (<i>p</i> &#x3c; 0.0001). <b><i>Conclusion:</i></b> PAIS incidence rates in Germany, extrapolated from estimates for completeness of reporting in the largest federal state, were within the range of other population-based studies. As a novel finding, we detected symptomatic PAIS in preterm-born infants to be as common as in term-born infants although their symptoms were often unspecific.

Patterns of Brain Injury in Perinatal Arterial Ischemic Stroke and the Development of Infantile Spasms

Introduction: Perinatal arterial ischemic stroke (PAIS) underlies approximately 10% of infantile spasms (IS). We aim to identify patterns of brain injury in ischemic stroke that may predispose infants to infantile spasms. Methods: Sixty-four perinatal arterial ischemic stroke patients were identified meeting the following inclusion criteria: term birth, magnetic resonance imaging (MRI) showing ischemic stroke or encephalomalacia in an arterial distribution, and follow-up records. Patients who developed infantile spasms (PAIS-IS) were analyzed descriptively for ischemic stroke injury patterns and were compared to a seizure-free control group (PAIS-only). Stroke injury was scored using the modified pediatric ASPECTS (modASPECTS). Results: The PAIS-IS (n = 9) group had significantly higher modASPECTS than the PAIS-only (n = 16) group ( P = .002, Mann-Whitney). A greater proportion of PAIS-IS patients had injury to deep cerebral structures (67%) than PAIS-only (25%). Conclusion: Infarct size was significantly associated with infantile spasms development. Results support theories implicating deep cerebral structures in infantile spasms pathogenesis. This may help identify perinatal arterial ischemic stroke patients at risk of infantile spasms, facilitating more timely diagnosis.