What is a characteristic feature of Tetralogy of Fallot?

Tetralogy of Fallot is defined by a specific set of four anatomical abnormalities, which are crucial to understanding the condition. One of the hallmark features is the presence of ventricular septal defect, which is a defect in the wall separating the two ventricles of the heart. This allows for abnormal blood flow between the heart chambers.

Additionally, there is a right ventricular outflow tract obstruction, which is a narrowing that occurs just below or within the pulmonary valve area, making it difficult for blood to pass from the right ventricle into the pulmonary artery. This obstruction can occur due to a muscular valve, a narrowed pulmonary valve, or other structural issues.

Lastly, obstruction of the left outflow tract can also be a feature in some cases, although it is not as common as the other components.

When considering these features together, they encompass the entire spectrum of Tetralogy of Fallot's typical presentation. Therefore, the answer incorporating all of these features reflects the complete nature of the syndrome, which is characterized by the combination of all four defects, validating the understanding that the condition indeed includes obstruction at both outflow tracts and a ventricular septal defect.