If your heart and its chambers weren't formed correctly before you were born, the blood flow in your heart or vessels near it may be blocked or have abnormal pathways or connections. This may cause oxygen-rich and oxygen-poor blood to mix (cyanosis). This makes it harder for your heart to pump blood around your body and the extra workload can cause heart failure.
For more information on congenital heart defects visit the websites below: Grown Up Congenital Heart Patients Association Congenital Heart Disease Website Congenitalheartdefects.com British Heart Foundation
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