QT Interval Changes in Children With Febrile Convulsion Compared With Healthy

Febrile seizure is a temperature-related seizure that affects the QT interval. The purpose of this study was to evaluate the changes in the QT interval caused by febrile convulsion (FC) compared with healthy children. 

This case-control study examined 180 children equally distributed between patients and controls. The study was conducted at the Ali Ebne Abi Talib Hospital in Zahedan City, Iran. The disease was diagnosed and confirmed based on standard definitions of FC. QT interval was measured by ECG and interpreted by a pediatric cardiologist, and collected data were analyzed using SPSS software, version 19 with a 0.05 significant level.

Among the ECG parameters, HR, R in aVL, S in V3, LVM, QTd, QTc, and QTcd were significantly different in children with FCs compared to their peers. From those who had abnormal QTd, FC children were more frequent which was not significant (χ2=1.053, P=0.248), while children with FC had significantly more abnormality regarding QTc (χ2=13.032, P<0.001) and QTcd (χ2=21.6, P<0.001). In children with FC, those who were less than 12 months had the highest level of HR which was not significant (χ2=4.59, P=0.101). Similar trends occurred for R in aVL and S in V3 that were higher in the age group >24 months (P>0.05). Children in the age group of >24 months had significantly had the highest LVM (χ2=52.674, P<0.001) and the other QT parameters were the same in FC children with different age groups (P>0.05).

It is concluded that dispersion corrected QT, corrected QT, and dispersion QT changed significantly in children with FC in comparison with the healthy children with constant values in children with FC in different age groups.