What it is
Inherited arrhythmia conditions are often called channelopathies. They involve the tiny channels in heart cells that move electrical charges, which time each heartbeat. When a gene change affects those channels, the heart's rhythm may become less stable in some situations. The heart's muscle structure can look normal in these conditions.
Well-known examples include long QT syndrome, Brugada syndrome and catecholaminergic polymorphic ventricular tachycardia (CPVT). Each has its own pattern on heart tracings, its own possible triggers and its own family inheritance patterns. Some people with these conditions notice fainting, palpitations or seizure-like episodes. Others have no noticeable signs.
Genetic heart testing looks for changes in genes linked to these conditions. A genetic test shows risk or carrier status. It does not diagnose heart disease on its own. Results need to be read alongside personal and family history, a physical exam, imaging and bloodwork by a qualified cardiologist, electrophysiologist or genetic counselor.
How it’s traditionally been approached
Traditionally, evaluation starts with conversation and observation. A clinician usually asks about fainting, palpitations, and any relatives who had unexplained fainting, seizures, drowning episodes or sudden death at a young age. This is why a family history of sudden cardiac death often prompts a closer look.
Heart rhythm tracings such as an electrocardiogram are a common part of the picture. Clinicians may also use other heart tests, rhythm monitoring or imaging, depending on the situation. Specialists in heart rhythm, called electrophysiologists, are often involved.
Genetic testing has been added to this process over time, often for the person with the condition first and then for relatives. Many families find that understanding the cause helps them talk with their clinicians about next steps. Only a licensed clinician can decide what is appropriate for any person after an evaluation.
How the right cardiologist may help
The right independent cardiologist may help you sort through questions about your heart rhythm and your family history. A first visit is generally a conversation: your symptoms, your relatives' health stories, medications and supplements you take, and what worries you most. Bringing notes about relatives, including ages and what happened, can be useful.
If genetic testing comes up, a cardiologist or genetic counselor may explain what it can and cannot tell you. Questions worth asking include: Is testing suitable for me or for a relative first? What might a positive, negative or uncertain result mean? A negative result does not rule out risk, and a variant of uncertain significance is not a diagnosis.
You may also want to ask about privacy and insurance before testing. In the US, GINA protects against genetic discrimination in health insurance and employment, but it does not cover life, disability or long-term-care insurance. Genetic counseling before and after testing is recommended, and when a disease-causing variant is found, cascade (family) testing may be discussed for relatives. Coverage varies by insurer, state and diagnosis, so confirm with your insurer and provider. Genetic counselor licensing varies by state.
The whole-person view
The body, mind and stress affect each other. Learning that a heart condition may run in your family can bring worry, guilt or fear, and those feelings can show up in the body as tension, poor sleep or a racing heart. Feeling this way is common and does not mean anything is wrong with you.
Some people find body-based support, such as the approaches offered through Somatic Experiences, helpful for feeling more settled. Others prefer talking with a licensed counselor through Therapists.plus. These are complements to medical care, not replacements, and every approach has value for different people.
Somatic Experiences: nervous system regulation →Somatic Experiences: embodiment and movement →Therapists.plus: anxiety panic and ocd →Therapists.plus: mind body connection →
Keep in mind
- Licensed professionals should guide all decisions about testing and care; this page is educational only and is not medical advice.
- Genetic tests show risk or carrier status and do not diagnose heart disease by themselves, and no test or procedure can promise to prevent a heart attack or sudden cardiac death.
- For fainting with chest pain, trouble breathing or a racing heartbeat, or if someone collapses, call 911.
- If you are in emotional crisis or distress, call or text 988 to reach the Suicide & Crisis Lifeline.
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Frequently asked questions
What is long QT syndrome genetic testing?
Long QT syndrome genetic testing is a test that looks for changes in genes linked to the heart's electrical timing. It shows risk or carrier status and does not diagnose the condition alone. A cardiologist, electrophysiologist or genetic counselor interprets it with your history, exam and heart tests.
Who might talk to a doctor about brugada syndrome testing?
People with unexplained fainting, certain heart tracing findings, or a relative with Brugada syndrome or sudden cardiac death may wish to ask a cardiologist about brugada syndrome testing. Whether testing is appropriate is a decision for a licensed clinician after an evaluation. Genetic counseling can help you weigh the options.
Can sudden cardiac death gene testing predict who is at risk?
Sudden cardiac death gene testing may identify a gene change linked to higher risk in some families, but it cannot predict what will happen to any one person. A negative result does not rule out risk, and a variant of uncertain significance is not a diagnosis. A qualified clinician can explain what results mean for you.
What does a family history of sudden cardiac death mean?
A family history of sudden cardiac death means a relative died suddenly from a heart cause, often at a younger age, and it may sometimes point to an inherited condition. It is not a diagnosis for you. Sharing the details with a cardiologist can help them decide whether further evaluation, including genetic counseling, makes sense.
What is catecholaminergic polymorphic ventricular tachycardia?
Catecholaminergic polymorphic ventricular tachycardia (CPVT) is an inherited rhythm condition in which the heart may develop abnormal rhythms during physical exertion or strong emotion. It can run in families and may be linked to certain genes. Evaluation and care should be guided by a licensed cardiologist or electrophysiologist.
Does GINA cover insurance after arrhythmia genetic testing?
GINA protects against genetic discrimination in US health insurance and employment, but it does not cover life, disability or long-term-care insurance. Ask about those policies before arrhythmia genetic testing. Coverage for testing itself varies by insurer, state and diagnosis, so confirm with your insurer and provider.
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.