“…15 Moreover, heart rate variability, which is a significant marker of autonomic nervous function and may predict tachyarrhythmia, may be significantly impaired in pregnant women after repair of congenital heart disease. 16 An arrhythmogenic effect could cause significant hemodynamic compromise in both the mother and fetus in women with repaired TOF with subclinical LV intolerance and RV dilation during pregnancy. 17, 18 Therefore, arrhythmia and an enlarged RV should be viewed with particular caution in the pregnancy management of these women.…”