5.9.1 Haemodynamic effects
The effect of pulmonary stenosis is to increase RV pressure and the work perby the RV. This results in concentric hypertrophy. This may lead to RV failure, weakness or collapse, and signs of right-sided CHF. If an intracardiac communication with the left side such as an ASD or a VSD is present, it may result in right to left shunting of blood and cyanosis.