الفهرس 
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Abstract
The aim of this thesis is to explore the variation of autonomic fluxes in different conditions with congenital heart diseases (CHD) and to establish the pattern of HRV in different varieties of CHD.
This would need the establishment of:
1) Normal values of HRV in children.
2) Pattern of HRV in different cardiac congenital anomalies.
3) Study differences in HRV in cyanotic versus acyanotic heart diseases.
By analysis of SAECG results, we conclude that, the normal limits of SAECG parameters, found to be (80.5-100.5) for QRS duration, (158.6-240.0) for RMS, (44.5-126.1) for RMS-40 and LAS between (2.7-10.3). this was nearly similar to what has been published in many literatures except for RMS-40 and LAS as all reported a lower RMS-40 (20-42) & a higher range for LAS (up to 38). All agree for that and called it … (the Gomes Score).
Although non of our patients had a positive result for late potentials according to this Gomes Score or to our reference data, we observed that cyanotic heart patients had significantly wider QRSD & LAS and a significant conclude that cyanotic patients might be more prone to the risk of arrhythmias and its complications.
On a trial to correlate the effect of age on HRV variables, our study revealed that, there is no significant age correlation with HRV in acyanotics, positive correlation of LF/HF in cyanotic and negative correlation as regard both LF& HF in control subjects with resultant no effect on the LF/HF ratio.
The age effect on SAECG results was in the form of age negative correlation with RMS & RMS-40 while age positive correlation with LAS in acyanotics. No correlations were found in both cyanotic and controls.
In contrary to our results, many authors reported that QRS duration increases linearly from about one year of age to adolescence.