If your son is indeed having cyanosis, this should not particularly be life-threatening. Fatal events from exercise in children and teenagers are most often caused by rhythm disturbances of the heart and it does not appear that is going on with your son. Specific information on prognosis, safety of exercise, and treatment should be obtained from his primary cardiologist, however. Therefore, I suggest that you speak with your son's cardiologist again and ask more specific questions about cyanosis, the possibility of another cardiac disorder other than pulmonic stenosis, and what he thinks is causing the episodes you describe. I hope you find this information useful.
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