What is a birth defect of the heart that leads to oxygen-poor blood circulating to the body without first passing through the lungs?

Cyanotic heart disease is characterized by conditions where there is a defect in the heart structure, leading to the mixing of oxygen-poor blood with oxygen-rich blood. This process results in inadequate oxygenation before the blood is pumped to the rest of the body. In cyanotic heart diseases, the oxygen-poor blood can bypass the lungs, where it would typically receive oxygen, and flow directly into systemic circulation, causing the body's tissues to receive insufficient oxygen.

This condition is often identified by a bluish tint to the skin, lips, and nails, known as cyanosis, which is a direct result of the low oxygen levels in the blood. Conditions within this category include various congenital heart defects, such as Tetralogy of Fallot and transposition of the great vessels.

The other options do not specifically denote a defect that leads to significant oxygen-poor blood circulation bypassing the lungs. Congenital heart defect is a broader term that encompasses all structural heart problems, but it does not solely focus on the oxygenation issue. Pulmonary hypertension refers to high blood pressure in the pulmonary arteries, which is not directly related to the mixing of blood. Valvular heart disease pertains to problems with the heart valves rather than the circulation of oxygen-po