(rollover to compare with normal)
|What Are Its Effects?
As a result of the malformation of the pulmonary valve, the pulmonary
artery becomes greatly enlarged and may interfere with breathing
by compressing the bronchial tubes. The large ventricular septal
defect allows the mixing of oxygen-rich and oxygen-poor blood
in the two ventricles. If also associated with some degree of
pulmonary valve stenosis, a significant amount of the poorly oxygenated
blood enters the systemic circulation from across the VSD and
is carried to the body's tissues, resulting in "blueness" or cyanosis.