Which of the following is a cyanotic congenital heart disease?

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Multiple Choice

Which of the following is a cyanotic congenital heart disease?

Cyanotic congenital heart disease occurs when deoxygenated blood reaches the systemic circulation, usually from a right-to-left shunt or markedly reduced pulmonary blood flow that prevents proper oxygenation. Tetralogy of Fallot fits this pattern because it combines four problems: a ventricular septal defect and obstruction of the right ventricular outflow tract (pulmonary stenosis), with the aorta positioned over the VSD (overriding aorta) and resulting right ventricular hypertrophy. The RV outflow obstruction creates a pressure difference that channels deoxygenated blood from the right ventricle across the VSD into the left heart and systemic circulation, leading to low oxygen levels and cyanosis. The degree of cyanosis can vary with the severity of the obstruction; during spells, decreased pulmonary blood flow worsens hypoxemia, and patients may squat to increase systemic vascular resistance and reduce the right-to-left shunt. The other conditions are typically acyanotic. Atrial septal defect usually drives a left-to-right shunt with preserved systemic oxygenation (cyanosis only arises late if Eisenmenger syndrome develops). Coarctation of the aorta is an obstructive lesion that does not inherently cause systemic cyanosis in infancy. Pulmonary valve stenosis by itself reduces flow to the lungs but does not inherently create a systemic right-to-left shunt and profound cyanosis unless accompanied by other defects.

Cyanotic congenital heart disease occurs when deoxygenated blood reaches the systemic circulation, usually from a right-to-left shunt or markedly reduced pulmonary blood flow that prevents proper oxygenation.

Tetralogy of Fallot fits this pattern because it combines four problems: a ventricular septal defect and obstruction of the right ventricular outflow tract (pulmonary stenosis), with the aorta positioned over the VSD (overriding aorta) and resulting right ventricular hypertrophy. The RV outflow obstruction creates a pressure difference that channels deoxygenated blood from the right ventricle across the VSD into the left heart and systemic circulation, leading to low oxygen levels and cyanosis. The degree of cyanosis can vary with the severity of the obstruction; during spells, decreased pulmonary blood flow worsens hypoxemia, and patients may squat to increase systemic vascular resistance and reduce the right-to-left shunt.

The other conditions are typically acyanotic. Atrial septal defect usually drives a left-to-right shunt with preserved systemic oxygenation (cyanosis only arises late if Eisenmenger syndrome develops). Coarctation of the aorta is an obstructive lesion that does not inherently cause systemic cyanosis in infancy. Pulmonary valve stenosis by itself reduces flow to the lungs but does not inherently create a systemic right-to-left shunt and profound cyanosis unless accompanied by other defects.

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