page_title: Trilogy of Fallot
section_title: Mechanism
hierarchical_section_title: Trilogy of Fallot / Mechanism
caption_attribution_description: English: дефект межпредсердной перегородки
context_page_description: The Trilogy of Fallot is a rare congenital heart disease consisting of the following defects: pulmonary valve stenosis, right ventricular hypertrophy and atrial septal defect. This disease is 1.6-1.8% of all congenital heart defects.
context_section_description: Trilogy of Fallot is a combination of three congenital heart defects: pulmonary stenosis, right ventricular hypertrophy, and an atrial septal defect. 
  The first two of these are also found in the more common tetralogy of Fallot. However, the tetralogy has a ventricular septal defect instead of an atrial one, and it also involves 
  Right Ventricular Hypertrophy
  an overriding aorta.
caption: Atrial Septal Defect
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