A friend of mine was born with pulmonary atresia, is there a risk if goes for steam sauna? he's currently on meds known as wafarin?

Virtual consultation: Virtual consultations are available to review his recent cardiac ECHO and oxygenation. The hemodynamics of his congenital heart disease may be reviewed with his Cardiologist. If he is mildly affected by the condition, breathing room air and able to exercise, then brief exposure to hot steam may be tolerated. Please check with his Cardiologist.