In total anomalous pulmonary venous return (TAPVR), the pulmonary veins incorrectly send blood to the heart's upper right chamber. That chamber is called the right atrium. As a result, oxygen-rich blood, shown in red, mixes with oxygen-poor blood, as shown in blue. In a typical heart, shown on the left, oxygen-rich blood flows from the pulmonary veins to the heart's upper left chamber, called the left atrium.
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