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ATRIAL FIBRILLATION

General Information

DEFINITION--A completely irregular heartbeat rhythm. Fibrillation means a quivering of heart-muscle fibers.

BODY PARTS INVOLVED--Heart muscles; the atrium (also called auricle), a chamber of the heart that connects to the left ventricle (main chamber); heart's electrical conduction system.

SEX OR AGE MOST AFFECTED--Adults of both sexes.

SIGNS & SYMPTOMS

  • No symptoms (sometimes).
  • Continuously irregular heartbeat, in which no 2 beats are of equal strength or duration.
  • Weakness, dizziness or faintness (sometimes).

CAUSES

  • Rheumatic heart disease caused by rheumatic fever.
  • Atherosclerosis of coronary arteries, with or without a previous heart attack.
  • Hyperthyroidism.
  • Congestive heart failure.

RISK INCREASES WITH

  • Stress.
  • Heart valve disease.
  • Recent heart surgery.
  • Electrolyte disturbances, especially low potassium.
  • Pulmonary embolism.
  • Excessive use of some drugs, such as thyroid hormones, caffeine and others.
  • Smoking.
  • Excess alcohol consumption.
  • Obesity.

HOW TO PREVENT--Avoid risk factors for atherosclerosis and coronary-artery disease (both in Illness section).


What To Expect

DIAGNOSTIC MEASURES--

  • Your own observation of symptoms.
  • Medical history and physical exam by a doctor.
  • ECG (See Glossary).
  • Blood studies to measure levels of drugs used in treatment.

APPROPRIATE HEALTH CARE

  • Self-care after diagnosis.
  • Doctor's treatment.
  • Hospitalization (sometimes).
  • Electric shock (electrocardioversion), which may restore normal rhythm.

POSSIBLE COMPLICATIONS

  • Acute pulmonary edema.
  • Arterial thrombosis or embolus.
  • Congestive heart failure.
  • Other heartbeat irregularities, triggering cardiac arrest.

PROBABLE OUTCOME--A normal heartbeat rhythm can be restored with electrocardioversion in about 50% of patients. In the other 50%, some symptoms can be controlled with medication. Those whose rhythm is restored to normal have a longer life expectancy, greater strength and more energy than those who have continuing atrial fibrillation.


How To Treat

GENERAL MEASURES--

  • Have family members and friends learn cardiopulmonary resuscitation (CPR) in case you have cardiac arrest.
  • Don't smoke, use mind-altering drugs or drink more than 1 or 2 alcoholic drinks--if any--a day.
  • Learn to check your own pulse for rate (beats per minute), rhythm (regular or irregular) and strength. Call your doctor if these change.
  • See How to Cope with Stress in Appendix section.
  • See Resources for Additional Information.

MEDICATION--Your doctor may prescribe:

  • Heart medications, such as digitalis, quinidine, calcium-channel blockers or beta-adrenergic blockers to regulate the heartbeat.
  • Anticoagulants to prevent blood clot.
  • Avoid non-prescription decongestants.

ACTIVITY-- Resume your normal activities as soon as symptoms improve. Consult your doctor before resuming sexual relations.

DIET--

  • Lose weight if you are obese, but don't use appetite suppressants. These may worsen rhythm disturbances. See Weight Loss diet in Appendix section.
  • The underlying heart condition may require a low-salt or low-fat diet (see diets in Appendix section) and potassium supplements.

Call Your Doctor If

  • You have symptoms of atrial fibrillation.
  • The following occurs during treatment: Change in heart rate, rhythm or strength. Chest pain, sweating and weakness. Shortness of breath and swollen feet and ankles. Pain in the calf of the leg while walking.
  • New, unexplained symptoms develop. Drugs in treatment may produce side effects.
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