Causes and Risk Factors
Atrial flutter becomes more common with age and with conditions that stretch or scar the atria:- Heart and lung disease: High blood pressure, coronary artery disease, valve disease, heart failure, and chronic lung disease all increase risk.
- Prior heart surgery or ablation: Scar tissue in the atria can create the short circuit that sustains flutter.
- Overactive thyroid: Excess thyroid hormone speeds and irritates the heart; see hyperthyroidism.
- Sleep apnea, alcohol, and stimulants: Untreated sleep apnea, heavy drinking, and stimulant use can trigger episodes.
- Diabetes and obesity: Both conditions strain the heart over time and are associated with more frequent atrial rhythm problems.
Symptoms
Some people feel nothing and the rhythm is found on a routine examination. Because the lower chambers often lock in at every second impulse, some people notice their heart rate seems stuck at the same fast number — often near 150 — whenever symptoms strike. When symptoms occur, they may include:- Palpitations: A rapid, often strikingly regular pounding or fluttering in the chest.
- Fatigue and reduced stamina: The heart pumps less efficiently at high rates, so exertion feels harder.
- Shortness of breath or chest discomfort: Especially with activity.
- Lightheadedness: Occasionally with near-fainting if the rate is very fast.
Diagnosis
An electrocardiogram usually makes the diagnosis, showing a characteristic "sawtooth" pattern of atrial activity. Because episodes can come and go, your physician may order a wearable heart monitor, along with an echocardiogram to assess the heart's structure and blood tests to check thyroid function. Blood tests also screen for anemia and electrolyte problems that can aggravate rapid rhythms. Atrial flutter is one of several rapid rhythms arising above the ventricles, a group that also includes supraventricular tachycardia.Treatment
Treatment has three goals — control the rate, restore normal rhythm, and prevent stroke. Your physician weighs how long the rhythm has been present, how fast it is, and your individual risk profile when choosing among these options:- Rate control: Beta-blockers such as metoprolol or calcium channel blockers such as diltiazem slow conduction to the lower chambers; digoxin is occasionally added.
- Stroke prevention: Like atrial fibrillation, flutter allows blood to pool and clot in the atria, so blood thinners such as apixaban or rivaroxaban are prescribed based on individual stroke risk.
- Cardioversion: A brief, controlled electrical shock delivered under sedation can restore normal rhythm.
- Catheter ablation: For typical atrial flutter, ablation interrupts the circuit with a very high success rate and is often recommended as a definitive treatment.
When to Seek Immediate Care
Call 911 for chest pain, fainting, severe shortness of breath, or any signs of stroke such as sudden weakness on one side, facial drooping, or trouble speaking. Because untreated atrial flutter can silently raise stroke risk and tire the heart, timely evaluation matters. The internal-medicine team at Zimmer Medical Group can detect the rhythm, start protective treatment, and coordinate care with an electrophysiologist when ablation is appropriate.Living With Atrial Flutter
Atrial flutter is one of the few heart rhythm problems with a treatment that usually ends it, and one of the few in which stopping the rhythm does not necessarily end the need for the rest of the plan. Understanding why explains most of the decisions made in the months after diagnosis.
Why ablation is often the first choice
Typical flutter runs around a fixed circuit in the right atrium, and burning a short line across it during a same-day catheter procedure stops the rhythm in the great majority of people with a low complication rate. Because medication controls flutter poorly and the procedure is so effective, ablation is offered early rather than as a last resort. A substantial share of people later develop atrial fibrillation, which uses different circuits, so follow-up monitoring continues after a successful ablation.
Anticoagulation decisions do not end with the rhythm
Stroke risk is scored on age, sex, blood pressure, diabetes, heart failure, vascular disease, and prior stroke, and when the score justifies it, apixaban, rivaroxaban, or dabigatran is prescribed, with warfarin reserved for mechanical valves or significant mitral stenosis. Before a cardioversion, anticoagulation runs for at least three weeks or a heart ultrasound excludes a clot, and it continues for at least four weeks afterward. Whether it stops after ablation depends on that risk score and the chance of atrial fibrillation, not on the ablation alone. Our atrial fibrillation article explains the scoring.
Rate control while waiting
Metoprolol or diltiazem slows the ventricular response, though flutter is notoriously hard to slow because the circuit conducts in fixed ratios; a rate that drops from 150 to 100 and sticks there is the circuit conducting every third beat rather than a cure. Diltiazem is avoided when the heart's pumping function is reduced, and digoxin adds little during activity. Medications that try to convert flutter can paradoxically speed the pulse and are given only with a rate-slowing drug on board.
The conditions that keep bringing it back
Untreated sleep apnea, alcohol, hyperthyroidism, uncontrolled blood pressure, obesity, and lung disease such as COPD stretch and irritate the atria, and treating them lowers the chance of both recurrent flutter and later fibrillation. A sleep study is worth arranging in anyone with flutter who snores or is tired during the day.
What it is confused with, and when to call
A regular pulse near 150 that does not change with rest, deep breathing, or a cool room is the signature of flutter; a fast pulse in the Florida heat that settles with fluids and shade is sinus tachycardia, and a rhythm that starts and stops abruptly is more typical of supraventricular tachycardia. A smartwatch recording during symptoms often settles the question, as our palpitations article explains. Chest pain, fainting, breathlessness at rest, or any stroke symptom is a 911 call. Our cardiovascular team coordinates monitoring, anticoagulation, and referral for ablation. NHLBI and MedlinePlus publish patient guidance on atrial flutter and fibrillation.
If you have atrial flutter and have not been offered ablation, or are unsure whether you should still be on a blood thinner, schedule a visit.