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Acyanotic heart defect have normal levels of oxyhemoglobin saturation in systemic circulation. This tends to be left to right side heart shunts, whereas cyanotic heart disease is right to left shunts which lowers oxygen saturation level.

Left to right shunting heart defects include ventricular septal defect

Ventricular septal defect

A ventricular septal defect is a defect in the ventricular septum, the wall dividing the left and right ventricles of the heart.The ventricular septum consists of an inferior muscular and superior membranous portion and is extensively innervated with conducting cardiomyocytes.The membranous...

 or VSD (30% of all congenital heart defects), patent ductus arteriosus

Patent ductus arteriosus

Patent ductus arteriosus is a congenital disorder in the heart wherein a neonate's ductus arteriosus fails to close after birth. Early symptoms are uncommon, but in the first year of life include increased work of breathing and poor weight gain...

 or PDA, atrial septal defect

Atrial septal defect

Atrial septal defect is a form of congenital heart defect that enables blood flow between the left and right atria via the interatrial septum. The interatrial septum is the tissue that divides the right and left atria...

 or ASD, and atrioventricular septal defect

Atrioventricular septal defect

Atrioventricular septal defect or atrioventricular canal defect , previously known as "common atrioventricular canal" or "endocardial cushion defect", is characterized by a deficiency of the atrioventricular septum of the heart...

 or AVSD.

Acyanotic heart defects without shunting include pulmonary stenosis, a narrowing of the pulmonary valve

Pulmonary valve

The pulmonary valve is the semilunar valve of the heart that lies between the right ventricle and the pulmonary artery and has three cusps. Similar to the aortic valve, the pulmonary valve opens in ventricular systole, when the pressure in the right ventricle rises above the pressure in the...

, aortic stenosis and coarctation of the aorta.