Fig. 2From: Characteristics of in-hospital mortality of congenital heart disease (CHD) after surgical treatment in children from 2005 to 2017: a single-center experienceAnnual operation volume for CHD and the cyanotic CHD proportion in children below 14 years old from 2005 to 2017. Chart a shows the annual cases of surgery for right-to-left shunt CHD, complex mixed defect CHD and total cyanotic CHD from 2005 to 2017. Chart b demonstrates the cyanotic CHD proportion (of total CHD in children below 14 years old) from 2005 to 2017Back to article page