Atrial flutter is a type of heart rhythm problem, also known as an arrhythmia, where the heart beats faster than normal in a regular but abnormal pattern. It affects the upper chambers of the heart, called the atria, and can lead to symptoms such as palpitations, breathlessness, and fatigue.

Although atrial flutter is less common than atrial fibrillation, the two conditions are closely related and sometimes occur together. This guide explains what atrial flutter is, why it happens, and when it may need treatment.

How the Heart Normally Beats

The heart’s rhythm is controlled by electrical signals that start in the sinus node, the heart’s natural pacemaker. These signals travel through the atria and then pass to the lower chambers, creating a coordinated and steady heartbeat.

In a normal rhythm, this process produces a regular heartbeat at a controlled rate. When the electrical signals become abnormal or loop repeatedly within the atria, atrial flutter can develop.

What Happens in Atrial Flutter?

In atrial flutter, the electrical signal circulates rapidly around the atria instead of following its usual pathway. This creates a fast but organised rhythm in the upper chambers, often around 250 to 300 beats per minute.

Not all of these signals pass to the lower chambers. The AV node filters them, resulting in a slower but still rapid pulse, often around 100 to 150 beats per minute. Unlike atrial fibrillation, which produces a chaotic rhythm, atrial flutter tends to be more regular. However, it still prevents the heart from working as efficiently as it should.

Symptoms of Atrial Flutter

Some people with atrial flutter notice symptoms immediately, while others have very mild or no symptoms at all. Common symptoms include a rapid or pounding heartbeat, breathlessness, fatigue, dizziness, and reduced exercise tolerance. Some people experience chest discomfort or a general feeling of unease. Because the heart is not pumping as efficiently, everyday activities may feel more tiring than usual.

What Causes Atrial Flutter?

Atrial flutter can develop in both healthy individuals and those with underlying heart conditions. Common causes include coronary artery disease, high blood pressure, heart valve disease, heart failure, and previous heart surgery. Lifestyle factors such as excess alcohol intake, stress, and stimulant use can also trigger episodes. In some cases, atrial flutter occurs without a clear cause. Age increases the likelihood of developing atrial flutter, although it can affect younger people as well.

Is Atrial Flutter Dangerous?

Atrial flutter is not always immediately dangerous, but it can lead to complications if left untreated. One of the main concerns is the increased risk of blood clots forming in the atria. These clots can travel to the brain and cause a stroke. Atrial flutter can also weaken the heart over time if the rate remains uncontrolled. This may lead to symptoms of heart failure. For these reasons, proper assessment and management are important.

How Atrial Flutter Is Diagnosed

Diagnosis usually begins with an ECG, which records the heart’s electrical activity. Atrial flutter produces a distinctive pattern on the ECG, often described as a saw tooth appearance. If the rhythm is intermittent, longer term monitoring may be required. This involves wearing a portable device to capture heart rhythm over 24 hours or longer. An echocardiogram may also be performed to assess heart structure and function. Blood tests can help identify contributing factors such as thyroid imbalance. The British Heart Foundation and the NHS provide further information on atrial flutter and heart rhythm conditions.

How Is Atrial Flutter Treated?

Treatment aims to control the heart rate, restore normal rhythm where possible, and reduce the risk of stroke. Medication is often used to slow the heart rate or help restore normal rhythm. Blood thinning medication may be prescribed to reduce the risk of clot formation. Cardioversion, a procedure that resets the heart rhythm, can be highly effective in restoring normal rhythm in atrial flutter. In some cases, a procedure called catheter ablation is recommended. This targets the abnormal electrical pathway and can provide a long term solution for many patients. Our treatment options are tailored to each individual, taking into account symptoms, risk factors, and overall health.

Atrial Flutter vs Atrial Fibrillation

Atrial flutter and atrial fibrillation are often linked and may occur in the same patient. Atrial flutter produces a fast but regular rhythm, while atrial fibrillation causes an irregular and chaotic rhythm. Both conditions increase stroke risk and may require similar treatments, including blood thinning medication. However, atrial flutter is often more amenable to curative treatment with ablation.

Living With Atrial Flutter

Many people continue normal daily activities once atrial flutter is properly managed. Controlling heart rate and rhythm often improves symptoms significantly. Lifestyle changes can also help reduce episodes. Limiting alcohol, managing stress, maintaining a healthy weight, and controlling blood pressure all support heart rhythm stability.

Regular follow up ensures treatment remains effective and allows early detection if the rhythm changes.

When Should You Seek Medical Advice?

You should seek medical advice if you experience persistent palpitations, a rapid heartbeat, dizziness, or unexplained fatigue. Sudden symptoms accompanied by chest pain, severe breathlessness, or collapse require urgent medical attention. You can contact us here to arrange a consultation if you are concerned about symptoms of atrial flutter or other heart rhythm problems.

Conclusion

Atrial flutter is a type of arrhythmia where the heart beats rapidly in a regular but abnormal pattern. While it may cause mild symptoms in some people, it can lead to complications such as stroke if left untreated. With early diagnosis and appropriate treatment, most people manage atrial flutter effectively and maintain a good quality of life.

We provide expert assessment and personalised care for patients with atrial flutter across Kent and East Sussex. If you are experiencing symptoms or would like reassurance about your heart rhythm, you can also call us on 01892 526726 to arrange a specialist consultation.