Atrial Flutter

Introduction

Atrial flutter is a type of abnormal heart rhythm (arrhythmia) that originates in the atria (upper chambers of the heart). It is characterized by a rapid but organized electrical activity that results in a fast heart rate. Atrial flutter is closely related to atrial fibrillation, another common arrhythmia, but has a distinct pattern.

Causes and Risk Factors

Atrial flutter can occur due to various underlying conditions, including:

  • Heart disease: Coronary artery disease, heart failure, cardiomyopathy.
  • Hypertension: High blood pressure increases the strain on the heart.
  • Valve disorders: Conditions affecting the heart valves, such as mitral stenosis or regurgitation.
  • Previous heart surgery: Especially after procedures like valve replacement or bypass surgery.
  • Lung diseases: Chronic obstructive pulmonary disease (COPD), pulmonary embolism.
  • Hyperthyroidism: Overactive thyroid can trigger arrhythmias.
  • Excessive alcohol or stimulant use: Alcohol binge drinking ("holiday heart syndrome") and stimulants like caffeine or nicotine.

Symptoms

Patients with atrial flutter may experience:

  • Rapid heart rate (palpitations)
  • Fatigue
  • Shortness of breath
  • Dizziness or lightheadedness
  • Chest discomfort

Some patients may have no symptoms, and atrial flutter may be diagnosed incidentally.

Diagnosis

Atrial flutter is diagnosed using:

  • Electrocardiogram (ECG): Shows a “sawtooth” pattern of electrical activity.
  • Holter monitoring: Records heart activity over 24-48 hours to detect intermittent episodes.
  • Echocardiogram: Assesses heart structure and function.
  • Blood tests: To check for thyroid abnormalities or electrolyte imbalances.

Treatment

Treatment of atrial flutter focuses on rate control, rhythm control, and stroke prevention:

1. Rate Control

  • Beta-blockers (e.g., metoprolol, atenolol)
  • Calcium channel blockers (e.g., diltiazem, verapamil)

2. Rhythm Control

  • Electrical cardioversion: A controlled electric shock to restore normal rhythm.
  • Antiarrhythmic medications: Such as amiodarone, sotalol, or flecainide.
  • Catheter ablation: A procedure to destroy the abnormal electrical circuit causing atrial flutter, often providing a long-term cure.

3. Stroke Prevention

  • Anticoagulants: Blood thinners such as warfarin or direct oral anticoagulants (DOACs) like apixaban or rivaroxaban to reduce the risk of stroke.

Conclusion

Atrial flutter is a treatable heart rhythm disorder, but it requires proper medical management to prevent complications such as stroke and heart failure. Early diagnosis and treatment improve outcomes and quality of life.

Source recommendations

1. 2023 AHA/ACC/ACCP/HRS Guideline for the Diagnosis and Management of Atrial Fibrillation

  1. https://www.ahajournals.org/doi/10.1161/CIR.0000000000001193
  2. https://pubmed.ncbi.nlm.nih.gov/38033089/
  3. https://www.hrsonline.org/guidance/clinical-resources/2023-accahaaccphrs-guideline-diagnosis-and-management-patients-atrial-fibrillation
  4. https://www.acc.org/Latest-in-Cardiology/ten-points-to-remember/2023/11/27/19/46/2023-acc-guideline-for-af-gl-af
  5. https://www.sciencedirect.com/science/article/pii/S0735109723078531

2. 2020 ESC Guidelines for the Diagnosis and Management of Atrial Fibrillation

  1. https://academic.oup.com/eurheartj/article/42/5/373/5899003
  2. https://pubmed.ncbi.nlm.nih.gov/32860505/
  3. https://www.escardio.org/static-file/Escardio/Guidelines/Documents/ehaa612.pdf
  4. https://www.ahajournals.org/doi/10.1161/CIR.0000000000001193
  5. https://pmc.ncbi.nlm.nih.gov/articles/PMC8432123/

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