Atrioventricular canal defect can involve only the two upper chambers of the heart or all four chambers. In both types, extra blood flows into the lungs. Symptoms depend on whether the defect is partial or complete. Complete defect The condition affects all of the heart's chambers. Symptoms of a complete atrioventricular canal defect usually develop in the first weeks of life. Symptoms are generally similar to those of heart failure. They may include:  Blue or gray skin color due to low oxygen levels Difficulty breathing or rapid breathing Excessive sweating Fatigue Irregular or rapid heartbeat Lack of appetite Poor weight gain Swelling in the legs, ankles and feet Wheezing  Partial defect The condition affects only the two upper heart chambers. Symptoms of a partial atrioventricular canal defect may not appear until early adulthood. The symptoms may be due to complications such as heart valve problems, high blood pressure in the lungs or heart failure. Symptoms may include:  Fatigue and weakness Nausea and lack of appetite Persistent cough or wheezing Rapid or irregular heartbeat, also called an arrhythmia Reduced ability to exercise Shortness of breath Swelling in the legs, ankles and feet Chest pressure or pain 
atrioventricular canal defect can involve only upper chambers heart chambers  types  extra blood flows lungs  symptoms depend defect partial complete  complete defect condition affects heart's chambers  symptoms complete atrioventricular canal defect develop first weeks life  symptoms generally similar heart failure  may include:  blue gray skin color due low oxygen levels difficulty breathing rapid breathing excessive sweating fatigue irregular rapid heartbeat lack appetite poor weight gain swelling legs  ankles feet wheezing  partial defect condition affects only upper heart chambers  symptoms partial atrioventricular canal defect may early adulthood  symptoms may due complications heart valve problems  high blood pressure lungs heart failure  symptoms may include:  fatigue weakness nausea lack appetite persistent cough wheezing rapid irregular heartbeat  called arrhythmia reduced ability exercise shortness breath swelling legs  ankles feet chest pressure pain 
atrioventricular canal defect