File:Tetralogy of fallot-the 4 defects.jpg

This picture demonstrates the four defects (numbers 1-4) found in Tetralogy of Fallot all the 4 defects contribute to poor oxygenation of blood.

1. Pulmonary Stenosis: The small pulmonary vessel causes less blood to enter to the lungs.

2. Displacement of the aorta: The displacement allows the aorta to receive both oxygenated and deoxygenated blood.

3. Ventricular Septal Defect: Allows deoxygenated blood to cross from the left side of the heart to the right side, or the opposite way (depending on pressure differences between left and right ventricles).

4. Right Ventricular Hypertrophy: Due to pulmonary stenosis, right ventricle must pump harder to compensare.

This is a drawing inspired by and based upon the article "When 'blue babies' grow up: What you need to know about tetralogy of Fallot" by David Fox, Ganesh P Devendra, Stephen A Hart, Richard A Krasuski published in the Cleveland Clinical Journal of Medicine in 2010, 77(11);821-8

PMID:21048055

Image link: http://www.ccjm.org/content/77/11/821/F1.expansion.html Article link: http://www.ccjm.org/content/77/11/821.long

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--z3291423 12:45, 11 September 2011 (EST)