What it is
Sudden cardiac death is an unexpected death caused by the heart suddenly stopping its normal rhythm or function. When a close relative has died this way, especially at a younger age, families often wonder whether an inherited heart condition could be involved.
Some heart rhythm disorders and cardiomyopathies (conditions of the heart muscle) can be passed down through families. Others are not inherited at all, so a family history does not automatically mean a genetic cause is present.
Genetic heart testing looks for changes in genes linked to certain inherited heart conditions. Results show risk or carrier status. They do not diagnose heart disease on their own and must be interpreted alongside personal and family history, physical exam, imaging and bloodwork.
How it’s traditionally been approached
Traditionally, the starting point has been a careful family health history: who was affected, at what age, and what is known about the cause. Medical records, autopsy findings or death certificates, when available, are often helpful.
Relatives have commonly been evaluated with a physical exam and non-invasive heart tests, such as an electrocardiogram or heart imaging. These help a clinician look for signs of conditions that may not cause obvious symptoms.
Genetic testing has been added in many settings, often alongside genetic counseling. Coverage for testing and follow-up varies by insurer, state and diagnosis, so it is worth confirming with your insurer and provider.
How the right cardiologist may help
The right cardiologist, electrophysiologist or genetic counselor may help you make sense of your family's story and decide which evaluations, if any, are appropriate for you. A visit generally involves reviewing your history, discussing your family tree, and talking through your questions and concerns.
Helpful questions to ask include: Does my family history suggest an inherited condition? Is genetic testing appropriate for me, or for another relative first? What could a negative result or a variant of uncertain significance mean? Which relatives might also want to be evaluated?
Genetic counseling is generally recommended before and after testing. If a disease-causing variant is found, cascade (family) testing of relatives may be discussed. Ask about GINA, which protects against genetic discrimination in US health insurance and employment but does not cover life, disability or long-term-care insurance, before you test.
The whole-person view
Heart health and emotional well-being are closely linked. Losing a relative suddenly, or living with uncertainty about your own risk, can bring grief, worry and stress, and stress can in turn affect sleep, energy and how the body feels.
Some people find body-based support, such as the approaches offered through Somatic Experiences, helpful for carrying that stress. Others find talk therapy through Therapists.plus useful for processing grief or health anxiety. Neither replaces medical care, and many people use more than one kind of support.
Somatic Experiences: nervous system regulation →Somatic Experiences: embodiment and movement →Therapists.plus: anxiety panic and ocd →Therapists.plus: mind body connection →
Keep in mind
- Genetic testing is educational information, not a diagnosis; a negative result does not rule out risk, and a variant of uncertain significance is not a diagnosis.
- Licensed professionals, such as a cardiologist, electrophysiologist or genetic counselor, should guide any evaluation and care decisions. Genetic counselor licensing varies by state.
- No test or procedure can promise to prevent a heart attack or sudden cardiac death.
- For an emergency such as fainting, chest pain or collapse, call 911. If you are in emotional crisis, call or text 988.
Not sure where to start? Answer a few gentle questions and choose who you’d like to hear from.
Keep exploring
Arrhythmia & sudden cardiac death genetics
Frequently asked questions
What does a family history of sudden cardiac death mean?
It means one or more relatives died suddenly from a cardiac cause, which may or may not point to an inherited condition. Some heart conditions run in families, but others do not. A qualified clinician can help interpret what your family's history may mean for you.
Should I get genetic heart testing if a relative died of sudden cardiac death?
Whether genetic heart testing is appropriate depends on your family history, the details of what happened, and your own health, so it is a decision to make with a cardiologist or genetic counselor. Sometimes testing a affected relative first, if possible, is more informative. Coverage varies, so confirm with your insurer.
Can genetic heart testing diagnose a heart condition?
No, genetic tests show risk or carrier status and do not diagnose heart disease on their own. Results are interpreted together with your history, exam, imaging and bloodwork. A qualified specialist makes any diagnosis.
Does a negative genetic test mean I am not at risk?
No, a negative result does not rule out risk. Not every gene linked to heart conditions is known or tested, and some conditions are not genetic. A variant of uncertain significance is also not a diagnosis, and your provider can explain what it may mean.
Does GINA protect my genetic test results?
GINA protects against genetic discrimination in US health insurance and employment. It does not cover life, disability or long-term-care insurance, so ask about those policies before testing. A genetic counselor can help you think this through.
Who should I see about a family history of sudden cardiac death?
A cardiologist, an electrophysiologist or a genetic counselor with experience in inherited heart conditions may be a good fit. Many people start with a conversation with their primary care clinician about a referral. Genetic counseling before and after testing is generally recommended.
Educational resource. CardioGenes shares general information and connects people with independent cardiologists. It is not medical advice, diagnosis or treatment. Talk with a licensed professional about your health.