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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