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Health condition · Clinically reviewed

Atrial flutter, an organised circuit with a curative fix.

A fast, regular atrial rhythm with a sawtooth ECG. Rate control and anticoagulation matter, but for typical flutter a short catheter procedure usually ends the problem for good.

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Why trust this guide

  • 01

    Clinically reviewed

    Written by our editorial team and reviewed by a registered UK clinician before publication.

  • 02

    Sourced from guidance

    Checked against NICE, ESC and peer-reviewed sources you can see at the end.

  • 03

    Current for 2026

    Reflects modern UK and ESC guidance including CTI ablation as first-line for symptomatic typical flutter.

Key facts

Atrial flutter at a glance.

The essentials, in plain English - what it is, how it differs from AF, and why CTI ablation matters.

  • What it is

    An organised atrial re-entrant tachyarrhythmia. Typical flutter loops around the cavotricuspid isthmus in the right atrium at 250 to 350 bpm.

  • Typical vs atypical

    Typical (isthmus-dependent) accounts for about 90 percent of cases. Atypical flutter often follows cardiac surgery or AF ablation and usually involves the left atrium.

  • Not the same as AF

    Flutter is organised with sawtooth F waves. Atrial fibrillation is chaotic and irregular. The two can coexist and switch back and forth.

  • Stroke risk

    Similar to atrial fibrillation. Anticoagulation is guided by the CHA2DS2-VASc score, not by the rhythm label.

  • First-line rhythm fix

    Cavotricuspid isthmus (CTI) catheter ablation is highly effective for typical flutter, with over 95 percent acute success and low recurrence.

  • 1:1 conduction

    A dangerous scenario where every atrial beat conducts, producing ventricular rates above 250 bpm. Adrenaline, exercise and flecainide alone can trigger it.

Why this guide matters

Three things to get right, early.

Flutter is common, treatable and, for the typical form, curable. The three points below shape everything else on this page.

  • Anticoagulate on CHA2DS2-VASc

    Stroke risk in flutter is the same as in AF. Anticoagulation is decided by the score, not by the rhythm label.

  • Never give flecainide alone

    Flecainide monotherapy can allow 1:1 conduction and cardiovascular collapse. Always co-prescribe a beta-blocker or non-DHP CCB.

  • Consider CTI ablation early

    For symptomatic typical flutter, ESC recommends catheter ablation as first-line therapy - preferred to long-term antiarrhythmic drugs.

How the diagnosis is made

From first palpitation to a clear plan.

The steps a UK GP or cardiologist will normally follow, in order - so you know what to expect and why.

  1. 01

    Assessing

    12-lead ECG

    The diagnostic test. Sawtooth F waves in inferior leads II, III and aVF at 250 to 350 bpm with variable AV block (2:1, 3:1, 4:1).

  2. 02

    Assessing

    Symptom and history review

    Palpitations, breathlessness, fatigue, chest discomfort or syncope. Paroxysmal or persistent pattern and any adrenergic triggers.

  3. 03

    Assessing

    Ambulatory monitoring

    24 to 72 hour Holter or an event recorder captures paroxysmal episodes when the resting ECG is normal.

  4. 04

    Confirming

    Echocardiogram

    Assesses left atrial size, left ventricular function and any valve or structural disease driving the arrhythmia.

  5. 05

    Confirming

    Bloods

    Thyroid function, electrolytes (potassium and magnesium), full blood count and renal function to look for reversible drivers.

  6. 06

    Confirming

    CHA2DS2-VASc score

    Formally scores stroke risk so anticoagulation can be started on the same basis as atrial fibrillation.

  7. 07

    Preparing

    Electrophysiology referral

    For symptomatic patients, early referral for CTI ablation is preferred over long-term antiarrhythmic drugs.

Typical timeline: from ECG to a settled plan in a matter of weeks.

Symptoms

What atrial flutter feels like.

The classic mix of palpitations, breathlessness and fatigue - plus the features that mean it is time to escalate.

  • Palpitations

    A fast, regular fluttering in the chest. Often the first symptom, and may be sustained or paroxysmal.

  • Breathlessness

    Especially on exertion, from rapid ventricular rates and loss of the atrial contribution to filling.

  • Fatigue and reduced exercise tolerance

    Common and often under-recognised. Can be the dominant complaint in persistent flutter.

  • Chest discomfort

    A tight or heavy sensation, sometimes with rate-related ischaemia in those with coronary disease.

  • Dizziness or syncope

    Suggests very rapid ventricular rates, pauses on conversion, or 1:1 conduction. Needs urgent review.

  • Worsening heart failure

    Fluid retention, orthopnoea or decompensation in patients with reduced LV function.

  • Paroxysmal or persistent pattern

    Episodes may self-terminate or persist for days. Persistent flutter more often needs cardioversion.

  • Red flag - 1:1 conduction

    Rapid ventricular rates above 250 bpm with adrenaline or exercise, or after flecainide monotherapy. A cardiology emergency.

Treatment

How atrial flutter is treated in the UK.

Rate control, anticoagulation and, for symptomatic typical flutter, CTI catheter ablation as the definitive fix.

  • Rate control - beta-blocker

    Bisoprolol or metoprolol first-line for controlling ventricular rate during flutter. Often combined with a rhythm strategy.

  • Rate control - non-DHP CCB

    Diltiazem or verapamil where beta-blockers are not tolerated. Avoid in reduced ejection fraction heart failure.

  • Digoxin adjunct

    A useful add-on for rate control, particularly in less active patients or when beta-blocker and CCB doses are limited.

  • Cardioversion

    Synchronised DC cardioversion is highly effective for persistent, symptomatic flutter. Chemical options include amiodarone and flecainide.

  • Anticoagulation

    Apixaban, rivaroxaban, edoxaban or dabigatran per CHA2DS2-VASc, or warfarin where DOACs are unsuitable. Same principles as atrial fibrillation.

  • CTI catheter ablation

    First-line for symptomatic typical flutter per ESC guidance. Over 95 percent acute success, under 5 percent recurrence, curative in most cases.

  • Complex atypical ablation

    Atypical or scar-related flutter needs 3D electroanatomic mapping and is technically more demanding. Referral to a specialist EP centre.

  • Treat the drivers

    Address structural heart disease, thyroid dysfunction, electrolytes, obstructive sleep apnoea, alcohol excess and weight - each reduces recurrence.

What this guide is based on

The sources behind every claim on this page.

UK national guidance and specialist society standards, current at the time of last review.

Key references

Guidelines and standards we relied on.

A quiet reminder

This guide is for information, not medical advice.

Your GP or cardiologist knows your heart and history and can tell you which parts apply to you. If in doubt, get seen.

  • ESC 2024. Guidelines for the management of atrial fibrillation and atrial flutter.

  • NICE NG196. Atrial fibrillation: diagnosis and management (informs anticoagulation and rate control).

  • Brugada J et al. 2019 ESC Guidelines for the management of patients with supraventricular tachycardia.

  • MHRA. Direct oral anticoagulant prescribing and monitoring guidance.

Red flags

When atrial flutter needs urgent attention.

Most flutter is manageable in outpatient care. These are the situations that are not - and where a specialist opinion is needed today.

  • 1:1 atrioventricular conduction

    Ventricular rates above 250 bpm, often with syncope or shock. A cardiology emergency requiring immediate rate slowing and cardioversion.

  • Syncope or pre-syncope

    Suggests very rapid rates, long pauses on conversion or coexisting structural disease. Needs same-day review.

  • Acute heart failure

    Pulmonary oedema or decompensation during flutter should prompt rate control, cardioversion and hospital admission.

  • Suspected stroke or TIA

    Any focal neurological symptom in a patient with flutter needs a stroke pathway assessment without delay.

  • Chest pain with flutter

    Consider rate-related ischaemia or acute coronary syndrome. A 12-lead ECG and troponin are essential.

  • Flecainide without AV blocker

    Flecainide monotherapy can slow the atrial rate and allow 1:1 conduction. Always co-prescribe a beta-blocker or non-DHP CCB.

  • Missed anticoagulation

    Interruptions in DOAC or warfarin therapy sharply raise stroke risk. Bridge and restart promptly after any pause.

  • Tachycardia-induced cardiomyopathy

    New LV dysfunction with persistent flutter. Usually reversible with rhythm or rate control, but needs urgent action.

  • Post-ablation atypical flutter

    New flutter after AF ablation or cardiac surgery may be left-atrial and needs specialist EP mapping.

Living with it

A treatable rhythm, with a clear plan.

Four things that make the biggest difference day to day - daily anticoagulation, cutting the drivers, monitoring your rate and pushing for ablation early where appropriate.

A quiet reminder

Consistency beats intensity, every time.

Steady habits kept up for months do more for your heart than a heroic week that does not last.

  1. 01 Adherence

    Take anticoagulation every day

    Missed DOAC doses are the single biggest preventable cause of flutter-related stroke. Set a routine and stick to it.

  2. 02 Triggers

    Cut the drivers

    Alcohol, poor sleep, untreated sleep apnoea and excess weight all raise recurrence. Small changes add up.

  3. 03 Monitor

    Know your resting rate

    A rising resting pulse or new breathlessness can be an early sign of recurrence. Contact your team.

  4. 04 Escalate

    Push for CTI ablation early

    For symptomatic typical flutter, catheter ablation is more effective than long-term drugs and is now first-line.

Frequently asked

Everything we get asked about atrial flutter.

Quick answers on ECG features, anticoagulation, 1:1 conduction and CTI catheter ablation.

  • What is atrial flutter?

    An organised atrial re-entrant tachyarrhythmia. Typical flutter loops around the cavotricuspid isthmus in the right atrium at 250 to 350 bpm and shows sawtooth F waves in leads II, III and aVF on the ECG. AV block usually keeps ventricular rates between 100 and 150 bpm.

  • Is atrial flutter the same as atrial fibrillation?

    No. Flutter is organised and regular, AF is chaotic and irregular. They share stroke risk and are often treated with the same anticoagulation strategy, but flutter is often more amenable to a curative catheter ablation.

  • How dangerous is 1:1 conduction?

    Very. If every atrial beat conducts to the ventricles, rates can exceed 250 bpm and cause syncope, ischaemia or cardiovascular collapse. It can be provoked by exercise, adrenaline or by flecainide given without a beta-blocker or non-DHP calcium channel blocker.

  • Do I need anticoagulation?

    Almost certainly, unless your CHA2DS2-VASc score is 0 in men or 1 in women. Stroke risk in atrial flutter is similar to atrial fibrillation, and NICE and ESC recommend the same anticoagulation approach - usually a DOAC such as apixaban, rivaroxaban, edoxaban or dabigatran.

  • What is CTI ablation and how successful is it?

    Cavotricuspid isthmus ablation is a catheter procedure that draws a line of block across the isthmus, breaking the flutter circuit. Acute success is over 95 percent and long-term recurrence under 5 percent. ESC guidance recommends it as first-line therapy for symptomatic typical flutter, preferred to long-term antiarrhythmic drugs.

  • Will ablation cure my flutter for good?

    For typical isthmus-dependent flutter, usually yes. Recurrence of the same circuit is uncommon. Some patients later develop atrial fibrillation - the two share risk factors - so ongoing follow-up and lifestyle work still matter.

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