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 mixes with oxygen-poor blood, as shown in purple. In a typical heart, shown on the left, oxygen-rich blood flows from the pulmonary veins to the upper left chamber, also called the left atrium.
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