Overview
The heart normally beats in a coordinated rhythm controlled by electrical signals. An arrhythmia happens when these signals start, travel, or recover abnormally, causing the heart to beat too fast, too slow, or irregularly. There are many types, including atrial fibrillation, supraventricular tachycardia, bradycardia, and ventricular arrhythmias. The effects range from no symptoms at all to severe symptoms and medical emergencies.
Key Symptoms
Some people notice a racing, fluttering, pounding, or skipped heartbeat. Other symptoms can include chest discomfort, shortness of breath, weakness, lightheadedness, dizziness, fainting, or near-fainting. In some cases, the first sign is a complication such as stroke or collapse. Symptoms may come and go, which can make arrhythmias harder to detect.
Causes and Risk Factors
Arrhythmias can happen because of coronary artery disease, heart failure, damaged heart muscle, heart valve disease, congenital heart conditions, thyroid problems, sleep apnea, or infections affecting the heart. They may also be linked to low or high levels of minerals such as potassium or magnesium, dehydration, alcohol use, smoking, stimulant drugs, and some medicines. Stress and heavy caffeine intake may trigger symptoms in some people. Risk tends to rise with older age and with conditions such as high blood pressure and diabetes.
Who Is Affected
Arrhythmias can affect people of any age, including children and healthy adults, but some types are more common in older adults and people with heart disease. Atrial fibrillation becomes more common with age. Certain inherited conditions can raise the risk in younger people. People with a family history of rhythm disorders or sudden cardiac death may also have higher risk.
Prevention
Not all arrhythmias can be prevented, but lowering heart disease risk can help. Managing blood pressure, diabetes, thyroid disease, and sleep apnea may reduce the chance of some rhythm problems. Avoiding tobacco, limiting alcohol, and being cautious with stimulant substances and non-prescribed drugs may also help. Regular medical follow-up is important if you have known heart disease or a family history of serious rhythm disorders.
Diagnosis and Tests
A healthcare professional may ask about symptoms, medical history, medicines, and family history, then examine you and check your pulse. Common tests include an electrocardiogram (ECG), blood tests, echocardiogram, exercise testing, and portable monitors such as a Holter or event recorder to capture rhythm changes over time. In some cases, more specialized heart rhythm testing is needed. Diagnosis matters because treatment depends on the exact type and cause of the arrhythmia.
Treatment Categories
Treatment depends on the type of arrhythmia, the symptoms, and whether there is a risk of stroke or sudden cardiac arrest. Options may include monitoring, treating underlying conditions, medicines, electrical cardioversion, catheter ablation, a pacemaker, or an implantable cardioverter-defibrillator. Some people with atrial fibrillation may also need treatment to lower stroke risk. A specialist in heart rhythm disorders may be involved in care.
Living With It
If you have an arrhythmia, keeping track of symptoms, triggers, and episodes can be helpful for medical visits. It is important to take medicines exactly as prescribed and to ask before starting over-the-counter medicines or supplements, because some can affect heart rhythm. Regular follow-up helps check whether treatment is working and whether risks have changed. Emotional stress is common with heart symptoms, so support from family, community, or a clinician may help.
When It May Be an Emergency
Seek emergency help right away if an irregular heartbeat happens with chest pain, severe shortness of breath, fainting, confusion, weakness on one side, trouble speaking, or collapse. Emergency care is also needed for symptoms of possible cardiac arrest, such as unresponsiveness or not breathing normally. Fast treatment can be critical because some arrhythmias can quickly become life-threatening. Do not try to drive yourself if you have severe symptoms.