Under normal conditions, your heart’s electrical system keeps everything beating in a steady, organized rhythm. The upper chambers (atria) push blood down to the lower chambers (ventricles), which then pump blood out to the rest of your body.

In atrial flutter, this rhythm gets disrupted. The atria start beating much faster than they should, outpacing the ventricles and throwing off the heart’s natural coordination. Because the atria are beating so quickly, they don’t have time to fully contract, which means less blood moves into the ventricles. This can lead to symptoms like shortness of breath, fatigue and a racing heartbeat. Atrial flutter may be intermittent (comes and goes) or persistent.

If atrial flutter isn’t treated, it can put extra strain on your heart over time and lead to more serious heart problems. It can also increase your risk of developing blood clots, which may cause a stroke if a clot travels to your brain.

What Are the Types of Atrial Flutter?

Atrial flutter can occur in different forms depending on where and how the fast electrical signals move through the heart. While all types of atrial flutter cause the upper chambers of the heart to beat too quickly, the patterns of these electrical signals can vary. Understanding the different types of atrial flutter can help you and your care team know what’s happening in your heart and which treatments will work best for you.

Typical Atrial Flutter

This is the most common type of atrial flutter. It happens when an electrical circuit forms in the right atrium, often looping around the tricuspid valve in a counterclockwise direction. Typical atrial flutter often shows up in people with existing heart disease, but it can also occur in those with otherwise healthy hearts. There are two main patterns:

• Counterclockwise flutter – The most common type, where the electrical signal travels upward along the septum and downward along the side of the right atrium.
• Clockwise flutter – A less common variation where the circuit moves in the opposite direction but stays within the right atrium.

Atypical Atrial Flutter

Atypical atrial flutter, sometimes called non-CTI dependent flutter, involves abnormal circuits outside the usual pathways seen in typical flutter. It’s often linked to prior heart surgeries, catheter ablation procedures or structural heart issues. Examples include:

• Left atrial flutter – This type starts in the left atrium and is often seen in people who have had ablation treatments for atrial fibrillation.
• Post-surgical flutter – This can develop after heart surgeries like valve repair or procedures to correct congenital heart defects.

What Are the Causes and Risk Factors of Atrial Flutter?

Atrial flutter happens when the heart’s electrical system gets off track, causing the upper chambers to beat rapidly and out of rhythm. This can occur due to a mix of structural and electrical changes in the heart, along with certain health conditions, such as:

• Heart disease – Conditions like coronary artery disease, valve problems or a history of heart attacks can contribute to atrial flutter.
• Infections – Infections such as endocarditis, which affects the lining of the heart, can play a role in developing atrial flutter.
• Previous heart surgery – Scar tissue from surgeries can disrupt the heart’s normal electrical pathways.
• Atrial fibrillation – This related heart rhythm issue can occur alongside atrial flutter or develop into it over time.
• Hyperthyroidism – An overactive thyroid can overstimulate the heart and lead to rhythm problems.
• Lung conditions – Issues like COPD or a pulmonary embolism can also contribute to atrial flutter.

In addition, certain factors can increase your risk of developing atrial flutter, including:

• Age – The risk goes up significantly after age 60.
• Lifestyle habits – Smoking, drinking too much alcohol, eating an unhealthy diet and lack of exercise can all raise your risk.
• Medical conditions – High blood pressure, diabetes, obesity, sleep apnea and heart failure can make atrial flutter more likely.

What Are the Symptoms and Warning Signs of Atrial Flutter?

Atrial flutter can affect how well your heart pumps blood, with symptoms ranging from mild to severe. Knowing what to watch for can help you catch problems early and prevent serious complications like stroke or heart failure.

Some of the most common symptoms include:

• A rapid or irregular heartbeat (palpitations)
• Shortness of breath
• Feeling tired or weak
• Lightheadedness or dizziness
• Chest discomfort or tightness
• A sense of anxiety or unease

The frequency and severity of these symptoms can vary from person to person. Some people might only feel a brief fluttering in their chest or occasional fatigue, while others may notice a constant racing heartbeat, difficulty breathing or a drop in their usual energy levels. In some cases, atrial flutter doesn’t cause any noticeable symptoms but can still increase the risk of blood clots and stroke.

If you experience ongoing palpitations, unexplained fatigue or shortness of breath, it’s a good idea to check in with your healthcare provider. You should seek emergency medical care right away if you experience:

• Fainting or feeling like you might faint
• Severe chest pain or pressure
• Sudden shortness of breath while at rest
• Confusion, slurred speech or sudden vision changes, which could be signs of a stroke

Diagnosis & Tests for Atrial Flutter

Diagnosing atrial flutter involves evaluating your symptoms, reviewing your medical history and using specific tests to check your heart’s rhythm and overall function. To start, your doctor will ask detailed questions about your symptoms, such as when they began, how often they happen and how severe they are. They’ll want to know if you’ve noticed palpitations, fatigue or shortness of breath.

Your doctor might also ask about other health conditions like high blood pressure, thyroid problems or a history of heart issues. This conversation helps identify possible triggers and guides the next steps in testing.

In addition to a detailed medical history and physical, the primary tool doctors use to diagnose atrial flutter is an electrocardiogram (EKG). This records your heart’s electrical activity and can detect abnormal rhythms.

If your symptoms aren’t captured during a standard EKG, your doctor might recommend additional tests, such as:

• Echocardiogram – An ultrasound of the heart that shows how well your heart is working and checks for valve issues, chamber enlargement or blood flow problems.
• Holter monitor or event recorder – These small, portable devices are worn for 24 hours or longer to catch irregular heart rhythms that don’t show up during a short EKG.
• Blood tests – These can check your thyroid function, look for electrolyte imbalances and detect markers of heart damage or infection.
• Cardiac MRI or CT scan – These imaging tests provide detailed pictures of your heart, helping to identify any structural problems or scar tissue.

These tests help your doctor confirm if you have atrial flutter, understand what’s causing it and check for any related complications. Since atrial flutter can look similar to other heart conditions, your doctor will also want to rule out issues like atrial fibrillation, supraventricular tachycardia (SVT), ventricular tachycardia and even anxiety or panic disorders.

How Do You Treat Atrial Flutter?

Sometimes, episodes of atrial flutter can go away on their own. However, most of the time, treatment is needed to prevent complications and help your heart return to a normal rhythm.

One of the most effective treatments for atrial flutter is catheter ablation. During this procedure, your doctor guides a catheter through a blood vessel to your heart. They then use targeted radiofrequency energy to carefully destroy the small area of heart tissue that’s causing the abnormal electrical signals. Catheter ablation has a high success rate for typical atrial flutter and can often remove the need for long-term medication.

In some cases, or if ablation isn’t the right option, medications can help manage your heart rate or rhythm. Antiarrhythmic drugs can be used to help your heart return to a normal rhythm, while beta-blockers or calcium channel blockers can help keep your heart rate under control. Blood thinners can also be prescribed to lower the risk of blood clots and stroke, especially for patients with other risk factors.

For people who have recurring episodes or more complex cases of atrial flutter, your doctor might also recommend:

• Lifestyle changes, such as eating a heart-healthy diet, staying active, limiting alcohol and caffeine and managing stress. These changes can help reduce how often episodes occur and support your overall heart health.
• Ongoing monitoring and working closely with an electrophysiology specialist who can track your heart health over time and adjust your treatment plan as needed, especially if your symptoms change or return. Note that some smartwatches detect irregular pulses but cannot diagnose atrial flutter nor should they replace proper medical treatment.

What Are the Complications and Long-Term Effects of Atrial Flutter?

If not managed properly, atrial flutter can impact heart function and lead to serious health complications. Some of these include:

• Stroke – When the atria beat rapidly and ineffectively, blood can pool and form clots. If a clot travels to the brain, it can cause a stroke, which could lead to a life-threatening situation or a permanent disability.
• Heart failure – The constant rapid rhythm can make it harder for your heart to pump blood efficiently, leading to symptoms like shortness of breath, swelling in the legs and fatigue as the heart struggles to keep up with the body’s needs.
• Cardiomyopathy – Over time, prolonged high heart rates can weaken the heart muscle, reducing its ability to pump blood and potentially leading to heart failure.
• Progression to atrial fibrillation – Many people with atrial flutter eventually develop atrial fibrillation, a more complex and often persistent heart rhythm disorder that can be harder to manage and further increase stroke risk.
• Reduced quality of life – Living with untreated atrial flutter can lead to frequent palpitations, dizziness and ongoing fatigue. These can all interfere with daily activities, exercise and sleep, impacting your overall well-being.

How Do You Prevent and Reduce the of Risk Atrial Flutter?

Preventing atrial flutter or reducing your risk of developing it largely comes down to protecting your heart’s overall health. While some cases are related to unavoidable factors like age or genetics, many are tied to lifestyle habits and other manageable medical conditions. To minimize your risk and support long-term heart function, be sure to:

• Maintain a healthy diet – Focus on nutrient-rich foods that support cardiovascular health, such as fruits, vegetables, whole grains and lean proteins.
• Exercise regularly – Aim for moderate physical activity most days of the week to strengthen the heart and improve circulation.
• Avoid excessive alcohol and caffeine – Both can trigger arrhythmias in sensitive individuals.
• Manage stress effectively – Chronic stress can affect heart rhythm, so consider relaxation techniques like meditation, breathing exercises or counseling.
• Quit smoking – Smoking damages blood vessels and increases the risk of heart disease.
• Treat underlying conditions – Control high blood pressure, diabetes, thyroid disorders and sleep apnea, which all increase atrial flutter risk.
• Take medications as prescribed – Blood thinners and rhythm-control medications may be needed for those at higher risk or with a history of arrhythmias.
• Monitor symptoms – Be aware of changes such as fatigue, palpitations or shortness of breath and report them to your doctor.

Routine check-ups with your cardiologist or primary care provider also play a crucial role in early detection and prevention. Regular screenings, such as blood pressure checks, ECGs and heart function tests, can identify early signs of rhythm disturbances or underlying issues before they worsen.

The TGH Difference for Atrial Flutter

Atrial flutter is a heart rhythm condition that can cause complications if it isn’t managed properly. For some people, symptoms can be mild, while others may feel tired, short of breath or notice a fast, racing heartbeat. If left untreated, atrial flutter can lead to more serious issues like stroke or heart failure. The good news is that with an accurate diagnosis and the right care, most people with atrial flutter can manage their condition and continue to live full, active lives.

At Tampa General Hospital’s Heart & Vascular Institute, patients receive personalized, comprehensive care from a nationally recognized team. Our specialists use the latest diagnostic tools and treatments to manage a wide range of heart and vascular conditions, including atrial flutter.

This commitment to exceptional care is reflected in the recognition we’ve received:

• One of the Nation’s Best Hospitals for Heart & Vascular Care by U.S. News & World Report for 2025–26.
• The #1 hospital in Tampa and West Central Florida for Cardiac Care for 2025 by Newsweek.
• A Top 100 Academic Medical Center to Know and Health Systems with Great Heart Programs by Becker’s Hospital Review in 2025.

If you’re experiencing symptoms of atrial flutter or have concerns about your heart health, we’re here to help. Call (813) 844-3900 to schedule an appointment with a cardiologist at TGH’s Heart & Vascular Institute.