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Digital clubbing and cyanotic nail beds in an adult with tetralogy of Fallot. 

Cyanotic heart disease comprises congenital heart defects present at birth that disrupt normal blood flow, allowing oxygen-poor blood to bypass the lungs and enter systemic circulation. This mixing results in inadequate oxygenation, manifesting as cyanosis—a bluish tint on the skin, lips, and nails—especially noticeable during crying or feeding. Common examples include Tetralogy of Fallot, transposition of the great arteries, tricuspid atresia, and total anomalous pulmonary venous return.

These defects often stem from abnormal heart development in the womb, influenced by genetic or environmental factors, though the exact cause remains unclear in many cases. Infants may exhibit rapid breathing, poor feeding, fatigue, and "tet spells" (sudden cyanotic episodes with hyperpnea).

This image illustrates digital clubbing and cyanotic nail beds, typical in chronic cases like Tetralogy of Fallot, highlighting long-term oxygen deprivation effects.

Diagnosis and Treatment

Diagnosis involves echocardiography, chest X-rays, ECG, and cardiac catheterization to assess defects and oxygen levels. Treatments range from medications (e.g., prostaglandins to maintain ductus arteriosus) and palliative shunts to full surgical corrections, often staged in infancy. Long-term care includes monitoring for arrhythmias, heart failure, and polycythemia. Early intervention significantly improves survival and quality of life.