Ictal and interictal electrographic seizure durations in preterm and term neonates

Epilepsia. Mar-Apr 1993;34(2):284-8. doi: 10.1111/j.1528-1157.1993.tb02412.x.


The effect of gestational age on neonatal ictal and interictal durations has not been investigated. Sixty-eight neonates with 644 electrographic seizures were identified retrospectively. Thirty-five full-term (FT) neonates were compared with 33 preterm (PT) neonates. Eighteen older preterm infants (OPT) [> 31 weeks estimated gestational age (EGA)] were also compared with 15 young preterm infants (YPT) of < or = 31 weeks EGA. Ictal/interictal durations were calculated for the total cohort with and without status epilepticus (SE). Statistical analyses were two-tailed t tests, chi-square calculations, and one-way analysis of variance (ANOVA) with Duncan's multiple-range test. Eleven of 35 (33%) FT had SE as compared with 3 of 33 (9%) PT (chi-square = 7.8, p < 0.05). The mean ictal duration was 14.2 min for FT infants as compared with 3.1 min for PT infants (p < 0.01); only borderline differences were noted after those with SE were excluded. Interictal durations were longer for OPT than YPT (p < 0.05). By ANOVA and Duncan's multiple-range tests, group differences included longer mean ictal durations for FT infants as compared with OPT infants (p = 0.06, ANOVA; p < 0.05, Duncan's), and longer mean interictal durations for FT infants versus OPT and OPT versus YPT (p = 0.02, ANOVA; p < 0.05, Duncan's). More developed neuronal networks result in longer ictal durations in FT than in PT neonates, including FT infants with SE.(ABSTRACT TRUNCATED AT 250 WORDS)

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Analysis of Variance
  • Chi-Square Distribution
  • Electroencephalography* / statistics & numerical data
  • Female
  • Gestational Age
  • Humans
  • Infant, Newborn
  • Infant, Premature, Diseases / diagnosis*
  • Infant, Premature, Diseases / physiopathology
  • Male
  • Retrospective Studies
  • Seizures / diagnosis*
  • Seizures / physiopathology
  • Status Epilepticus / diagnosis
  • Status Epilepticus / physiopathology