Atrial flutter is a fast, very regular heart rhythm caused by an electrical signal circling repeatedly through the heart's upper chambers. It shares many features — and many of the same risks and treatments — with atrial fibrillation, its close relative.
What Is Atrial Flutter?
An abnormal heart rhythm in which the upper chambers (atria) beat very fast — often around 250–350 times per minute — in a fast, regular circuit, while the lower chambers (ventricles) typically respond at a slower, sometimes irregular rate.
What's Happening in Your Heart
Instead of the normal single, organized electrical signal that spreads through the atria with each heartbeat, a single abnormal circuit forms and repeatedly circles a specific pathway (most commonly around a structure in the right atrium), causing extremely fast atrial activity. Because the heart's natural "gatekeeper" (the AV node) can't conduct every one of these fast signals to the ventricles, the ventricular rate is usually somewhat slower and often has a characteristic regular pattern — commonly a fixed ratio like every second or third atrial signal getting through.
Types & Causes
- Typical atrial flutter — follows a specific, well-defined circuit, the most common form and the one most reliably treated with catheter ablation
- Atypical atrial flutter — follows other, more variable circuits, sometimes related to prior heart surgery or ablation scarring
- Risk factors overlap substantially with atrial fibrillation — high blood pressure, structural heart disease, sleep apnea, and age among them
- Frequently occurs together with, or evolves into, atrial fibrillation in the same patient
Common Symptoms
Palpitations (often a notably fast, very regular racing sensation), fatigue, shortness of breath, or reduced exercise tolerance. Some people, particularly older adults, have few or no symptoms despite a fast heart rate.
How It's Diagnosed
An ECG usually shows a distinctive "sawtooth" pattern that's often immediately recognizable to your care team. A Holter monitor or longer-term rhythm monitoring can catch flutter that comes and goes. An echocardiogram assesses for underlying structural heart disease. (See Cardiac Testing & Imaging.)
Main Treatment Options
Rate control (slowing the ventricular response, often with beta-blockers or certain calcium channel blockers) and/or rhythm control (restoring and maintaining normal rhythm) — similar principles to atrial fibrillation management. Catheter ablation is particularly effective for typical atrial flutter, with a high success rate, and is often recommended earlier than it might be for atrial fibrillation given how reliably the specific circuit can be targeted. Anticoagulation to prevent stroke is assessed using the same risk-based approach as atrial fibrillation, since the stroke risk is considered similar. (See Anticoagulants.)
Lifestyle Changes That Help
- Treating underlying contributors — blood pressure control, sleep apnea treatment, and other structural heart disease management
- The same heart-healthy habits that help atrial fibrillation (see Atrial Fibrillation)
Living With It
Many people do very well long-term, particularly after catheter ablation for typical atrial flutter, which has a high success rate. Because flutter and fibrillation are closely related, some people who've had flutter ablated go on to develop atrial fibrillation later, which is why ongoing awareness of symptoms and, in some cases, continued anticoagulation remain relevant even after successful treatment.
When to Call Your Doctor vs. Go to the ER
- New or increasing palpitations
- A racing heart rate that doesn't resolve
- Chest pain, fainting, or severe shortness of breath, along with a fast heart rate
Common Questions
Is this the same as atrial fibrillation?
Related but distinct — flutter is a single, organized fast circuit, while fibrillation is chaotic, disorganized electrical activity; they share many risk factors and treatments, including stroke risk and the need for anticoagulation in many patients.
Will ablation cure this?
For typical atrial flutter, catheter ablation has a high success rate and often provides a lasting cure, though your care team will discuss your individual likelihood of success and recurrence.
Do I need to take a blood thinner?
Often yes — stroke risk with atrial flutter is generally treated the same way as with atrial fibrillation, based on your individual risk factors rather than the rhythm label alone.
Why does my heart rate look so regular if my rhythm is abnormal?
Because the AV node is filtering the very fast atrial signal down to the ventricles in a consistent pattern (like every other beat), which produces a rate that's fast but strikingly regular — a helpful clue on the ECG that often points toward flutter rather than fibrillation.
Why is ablation offered earlier for flutter than it typically is for AFib?
Typical atrial flutter follows one well-defined, reliably targetable circuit, so ablation tends to have a higher success rate than for atrial fibrillation — which is why it's often recommended sooner rather than trying multiple medications first.