The complication rate is very low, and includes those common for any open-heart operation. This includes bleeding needing blood transfusions and rhythm disturbances - arrhythmia. Sometimes the relief of block may be incomplete due to technical problems. Most types of PS however can be effectively relieved by operation. Also, any additional defects can be treated at the same time.
Most patients operated for pulmonary stenosis go on to lead normal lives.
The risk of late complications is very low. In most children, as growth occurs, the pulmonary valve also becomes larger, and this itself reduces the stenosis to some extent. The potential problems are rhythm disturbances and late pulmonary valve leak due to injury at the time of treatment. Let me know what you think about it. Learn a little more about heart disease and its treatment.