May I add that genetic testing can be considered? If the mutated gene responsible for your HCM can be found, your relatives can then be tested to find out if they have the same mutated gene as well. Those who do can be proactive in caring for themselves. Sometimes, as in my case, no mutated gene was found - yet - 123 genes at that time were known to cause the HCM mutation - more can be discovered. In that case, relatives can choose to have echocardiogram screenings periodically as recommended by their cardiologists.