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Greetings,Thank you for your question. I am Dr. Su S. and I will try my best to help you.
I am sorry for his symptoms.
Pulmonary stenosis is a common complication of arterial switch operation.
It can develop any time after surgery.
It is seen 7-40% of cases who underwent surgery.
This is a common cause for re intervention.
Sometimes repeated catheterization can be needed to open up the stenosis.
He will need regular followup with echocardiogram to diagnose any further stenosis in the early stage.
I hope this information will be helpful.If you have any query, please feel free to ask.Wish his healthy life.Regards.