Abnormal Heart Rhythms (Arrhythmias)
Abnormal Heart Rhythms (Arrhythmias)
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"Arrhythmia" means your heartbeat is irregular. It doesn't necessarily mean your heart is beating too fast or too slow. It just means it's out of its normal rhythm.
It may feel like your heart skipped a beat, added a beat, is "fluttering," or is beating too fast (which doctors call tachycardia) or too slow (called bradycardia). Or, you might not notice anything, since some arrhythmias are "silent."
Heart Tests Your Doctor May Recommend
Preventing a heart attack is a lot easier when you -- and your doctor -- know exactly what's going on in the vessels that carry blood throughout your body. Are they blocked with plaque or free-flowing? To find out, your doctor may recommend a high-tech imaging test that shows a clear image of your arteries. Here's what you need to know about them.
Read the Heart Tests Your Doctor May Recommend article > >
Arrhythmias can be an emergency, or they may be harmless. If you feel something unusual happening with your heartbeat, call 911 so doctors can find out why it's happening and what you need to do about it.
You could have an arrhythmia even if your heart is healthy. Or it could happen because you have:
The many types of arrhythmias include:
Premature atrial contractions. These are early extra beats that start in the heart's upper chambers, called the atria. They are harmless and generally don't need treatment.
Premature ventricular contractions (PVCs). These are among the most common arrhythmias. They're the "skipped heartbeat" we all occasionally feel. They can be related to stress or too much caffeine or nicotine. But sometimes, PVCs can be caused by heart disease or electrolyte imbalance. If you have a lot of PVCs, or symptoms linked to them, see a heart doctor (cardiologist).
Atrial fibrillation. This common irregular heart rhythm causes the upper chambers of the heart to contract abnormally.
Atrial flutter. This is an arrhythmia that's usually more organized and regular than atrial fibrillation. It happens most often in people with heart disease and in the first week after heart surgery. It often changes to atrial fibrillation.
Paroxysmal supraventricular tachycardia (PSVT). A rapid heart rate, usually with a regular rhythm, starting from above the heart's lower chambers, or ventricles. PSVT begins and ends suddenly.
Accessory pathway tachycardias. You can get a rapid heart rate because there is an extra pathway between the heart's upper and lower chambers. It's just like if there was an extra road on your way home as well as your usual route, so cars can move around faster. When that happens in your heart, it can cause a fast heart rhythm, which doctors call tachycardia. The impulses that control your heart rhythm travel around the heart very quickly, making it beat unusually fast.
When Your Heart Rhythm Isn't Normal
In this article
- Causes and Types of of Arrhythmias
- Symptoms of Arrhythmias
- Diagnosis of Arrhythmias
- Treatment of Arrhythmias
- What Is Electrical Cardioversion?
- What Is a Pacemaker?
- What Is an Implantable Cardioverter Defibrillator (ICD)?
- What Is Catheter Ablation?
- Heart Surgery for Arrhythmias
Font Size
A
A
A
"Arrhythmia" means your heartbeat is irregular. It doesn't necessarily mean your heart is beating too fast or too slow. It just means it's out of its normal rhythm.
It may feel like your heart skipped a beat, added a beat, is "fluttering," or is beating too fast (which doctors call tachycardia) or too slow (called bradycardia). Or, you might not notice anything, since some arrhythmias are "silent."
Recommended Related to Heart Disease
Heart Tests Your Doctor May Recommend
Preventing a heart attack is a lot easier when you -- and your doctor -- know exactly what's going on in the vessels that carry blood throughout your body. Are they blocked with plaque or free-flowing? To find out, your doctor may recommend a high-tech imaging test that shows a clear image of your arteries. Here's what you need to know about them.
Read the Heart Tests Your Doctor May Recommend article > >
Arrhythmias can be an emergency, or they may be harmless. If you feel something unusual happening with your heartbeat, call 911 so doctors can find out why it's happening and what you need to do about it.
Causes and Types of of Arrhythmias
You could have an arrhythmia even if your heart is healthy. Or it could happen because you have:
- Heart disease
- The wrong balance of electrolytes (such as sodium or potassium) in your blood
- Changes in your heart muscle
- Injury from a heart attack
- Healing process after heart surgery
The many types of arrhythmias include:
Premature atrial contractions. These are early extra beats that start in the heart's upper chambers, called the atria. They are harmless and generally don't need treatment.
Premature ventricular contractions (PVCs). These are among the most common arrhythmias. They're the "skipped heartbeat" we all occasionally feel. They can be related to stress or too much caffeine or nicotine. But sometimes, PVCs can be caused by heart disease or electrolyte imbalance. If you have a lot of PVCs, or symptoms linked to them, see a heart doctor (cardiologist).
Atrial fibrillation. This common irregular heart rhythm causes the upper chambers of the heart to contract abnormally.
Atrial flutter. This is an arrhythmia that's usually more organized and regular than atrial fibrillation. It happens most often in people with heart disease and in the first week after heart surgery. It often changes to atrial fibrillation.
Paroxysmal supraventricular tachycardia (PSVT). A rapid heart rate, usually with a regular rhythm, starting from above the heart's lower chambers, or ventricles. PSVT begins and ends suddenly.
Accessory pathway tachycardias. You can get a rapid heart rate because there is an extra pathway between the heart's upper and lower chambers. It's just like if there was an extra road on your way home as well as your usual route, so cars can move around faster. When that happens in your heart, it can cause a fast heart rhythm, which doctors call tachycardia. The impulses that control your heart rhythm travel around the heart very quickly, making it beat unusually fast.
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