The relationship of recurrence rate and the age and body temperature of first febrile seizures in children

Objective To explore the relationship of recurrence rate and the age and body temperature of fitrst febrile seizures (FS) in children.Methods One hundred and ninety-two cases of FS admitted to our hospital from Jan 2004 to Jun 2006,were divided into three groups according to the initial onset of body temperature with FS:＞40.0 ℃,～40.0 ℃,≤38.5 ℃ ;three groups according to the duration between fever initiation and seizure attack:≤6 h,～ 12 h,～24 h,＞24 h;four groups according to age:≤6 months,～ 18 months,～ 3 years,＞ 3 years.For each group of children with FS,the recurrence rate and follow-up were compared.Results All cases were followed up to 6 years old,22 cases were lost,and the follow-up rate was 88.5％ (170/192).Follow-up of 170 children with FS,the recurrence rate was 32.6％ (15/46),51.1％ (46/90) and 79.4 ％ (27/34) in each group of temperature ＞ 40.0 ℃,～ 40.0 ℃,and ≤ 38.5 ℃.There were statistically significant among three groups (x2 =17.18,P ＜ 0.05).Duration of fever before seizures ≤ 6 h group,～24 h group,＞ 24 h group,the recurrence rate were 70.7 ％ (29/41),51.6％ (49/95) and 29.4％ (10/34) respectively,the recurrence rate was significant difference among the three groups(x2 =12.71,P ＜0.05).The recurrence rate of different age groups in initial attack of FS were 84.6％ (22/26),63.4％ (45/71),39.5％ (15/38),17.I％ (6/35),the differences were statistically significant (x2 =34.17,P ＜ 0.05).Conclusion There was higher recurrence rate of febrile seizure in small children,lower body temperature and shorter duration between fever initiation and seizure attack. Key words: Febrile seizure;  Recurrence rate;  Body temperature;  Age;  Children