Improved medical and surgical treatment facilities for children suffering from congenital heart disease have resulted in a growing population of patient reaching adulthood. One million people over the age 20 years suffer from congenital heart disease in USA. Population of adult CHD is growing at rate of 5% per year in USA and the number of patient with congenital heart disease are more in the age group over 20 year than less than 20 years1-2.