The objective of this study was to evaluate the QT interval and the effects of intrauterine malnutrition in small for gestational age babies (SGA). In this study, ECGs were recorded on their postnatal day five. Twenty-two SGA infants and 20 appropriate for gestational age babies (AGA) were evaluated. Heart rate, QT interval, QT interval corrected for heart rate (QTc), QT dispersion (QTD) and QTc dispersion (QTcD) were calculated for all infants.
The mean QT and QTc were 265±47 msec, and 379±45 msec in the small for gestational age babies; whereas in the appropriate for gestational age babies the mean QT and QTc were 254±30 msec, and 367±33 msec (p>0.05). QTD was found 37±9 msec and, 30±9 msec in the SGA and AGA babies respectively. QTcD was found as 57±15 msec and, 47±12 msec in the SGA and AGA babies respectively. QTD and QTcD were found to be higher in the small for gestational age babies (p<0.05). Significantly negative correlations were detected between the birth weight and QTD and QTcD (p<0.05; r= –0.380 and –0.360, respectively).
The present findings suggest that QTD and QTcD values are significantly increased in SGA babies and it can be show deterioration of ventricular repolarization. Small for gestational age may be associated with an increased risk for the arrhythmia and sudden infant death.