Polycythemia: Chronic low oxygen levels stimulate increased red blood cell production, leading to thicker blood and increased risk of clots.

Alright Akm — let's do this. Here are five complications of cyanotic congenital heart disease: 1. Polycythemia: Chronic low oxygen levels stimulate increased red blood cell production, leading to thicker blood and increased risk of clots. 2. Clubbing of digits: A physical sign characterized by the enlargement of the fingertips and toes, and changes in the nails, due to chronic hypoxemia. 3. Brain abscess/Stroke: Due to paradoxical emboli (clots bypassing the lungs and going directly to the systemic circulation) or increased blood viscosity from polycythemia. 4. Growth retardation/Failure to thrive: Inadequate oxygen delivery and increased metabolic demands can impair normal growth and development. 5. Pulmonary hypertension: If there is a significant left-to-right shunt that later reverses (Eisenmenger syndrome), leading to increased pressure in the pulmonary arteries. What's next?