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The first operation, a Blalock-Taussig shunt, creates a pathway for blood to reach the lungs. A connection is made between the first artery that branches off the aorta (called the right subclavian artery) and the right pulmonary artery. Some of the blood traveling through the aorta towards the body will "shunt" through this connection and flow into the pulmonary artery to receive oxygen. However, the child will still have some degree of cyanosis since oxygen-poor (blue) blood from the right atrium and oxygen-rich (red) blood from the left side of the heart mix and flow through the aorta to the body.