The general consensus appears to be that any patient with at least moderate AS should only engage in light physical exercise. The reason for those recommendations is that with AS, there is a fixed obstruction to the ejection of blood from the left ventricle. During rest or light exertion, that obstruction usually doesn't cause a problem but during exercise when the heart rate and cardiac output increase, a fixed obstruction could cause loss of consciousness and more serious problems. Thus, your son should see a cardiologist in Australia before starting scuba diving. I hope you find this information useful.
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