OBSTRUCTION OF BLOOD FLOW: Blood is obstructed from flowing OUT of the heart, causing back flow of blood into and causing Heart Failure. Defects include: 1. Coarctation of the (COA) 2. Aortic (AS) 3. Stenosis (PS) MIXED BLOOD FLOW (CYANOTIC) : There is a MIXING of and deoxygenated blood resulting in DESATURATED blood being circulated to the body. This causes Pulmonary And DECREASED Cardiac Output. Defects Include: 1. Transposition of the Vessels (TGA) 2. Total pulmonary venous connection (TAPVC) 3. arteriosus (TA) 4. Left Heart (HLH).