What is an arrhythmia?
An arrhythmia is an abnormal heart rhythm.
Some arrhythmias can cause problems with contractions of your heart chambers by:
- Not allowing the lower chambers (ventricles) to fill with enough blood, because an
abnormal electrical signal is causing your heart to pump too fast or too slow.
- Not allowing enough blood to be pumped out to your body, because an abnormal electrical
signal is causing your heart to pump too slowly or too irregularly.
- Not allowing the top chambers (atria) to work properly.
An arrhythmia can occur in the sinus node, the atria, or the atrioventricular node.
These are supraventricular arrhythmias. A ventricular arrhythmia is caused by an abnormal
electrical focus within your ventricles. This results in abnormal conduction of electrical
signals within your ventricles. Arrhythmias can also be classified as slow (bradyarrhythmia)
or fast (tachyarrhythmia). "Brady-" means slow, while "tachy-" means fast.
In any of these situations, your body's vital organs may not get enough blood to meet
What causes an arrhythmia?
An arrhythmia occurs when there is a problem with the electrical system that is supposed
to regulate a steady heartbeat. With an impaired electrical system, your heart may
beat too fast, too slow, or irregularly.
What are the risk factors for an arrhythmia?
Many risk factors can affect the electrical system of your heart and, therefore, cause
an arrhythmia. Substances including caffeine, alcohol, tobacco, illegal drugs, diet
drugs, some herbs, and even prescription medicines can trigger an arrhythmia. Health
conditions including coronary heart disease, high blood pressure, and diabetes contribute
to developing arrhythmias. Arrhythmias become more common with age.
What are the symptoms of arrhythmias?
The effects on the body are often the same, however, whether the heartbeat is too
fast, too slow, or too irregular. Some symptoms of arrhythmias include:
- Palpitations (a sensation of fluttering or irregularity of the heartbeat)
- Low blood pressure
- Heart failure
- Collapse and cardiac arrest
- Difficulty feeding (in babies)
The symptoms of arrhythmias may look like other conditions. Always see your healthcare
provider for a diagnosis.
How are arrhythmias diagnosed?
There are several tests that may be used to diagnose arrhythmias. Some of these include:
- Electrocardiogram (ECG). An electrocardiogram is a measurement of the electrical activity of your heart. By
placing electrodes at specific locations on your body (chest, arms, and legs), a graphic
representation, or tracing, of the electrical activity can be made as the electrical
activity is received and interpreted by an ECG machine. An ECG can show the presence
of arrhythmias, damage to your heart caused by ischemia (lack of oxygen to the heart
muscle), or myocardial infarction (MI, or heart attack), a problem with one or more
of the heart valves, or other types of heart conditions.
There are several variations of the ECG test:
- Resting ECG. For this procedure, the clothing on your upper body is removed and small sticky patches
called electrodes are attached to your chest, arms, and legs. These electrodes are
connected to the ECG machine by wires. The ECG machine is then started and records
your heart's electrical activity for a minute or so. You are lying down during this
- Exercise ECG, or stress test. You are attached to the ECG machine as described above. However, rather than lying
down, you exercise by walking on a treadmill or pedaling a stationary bike while the
ECG is recorded. This test is done to assess changes in the ECG during stress, such
- Signal-averaged ECG. This procedure is done in the same manner as a resting ECG, except that your heart's
electrical activity is recorded over a longer period of time, usually 15 to 20 minutes.
Signal-averaged ECGs are done when arrhythmia is suspected, but not seen on a resting
ECG. The signal-averaged ECG has increased sensitivity to abnormal ventricular activity
called "late potentials." Signal-averaged ECG is used in research and seldom used
in clinical practice.
- Electrophysiologic studies (EPS). A nonsurgical but invasive test in which a small, thin tube (catheter) is inserted
into a large blood vessel in your leg or arm and advanced to your heart. This lets
your doctor find the site of the arrhythmia's origin within your heart tissue. Your
doctor is then able to determine how to best treat it. Sometimes, your doctor can
treat the arrhythmia by doing an ablation at the time of the study.
- Holter monitor. A continuous ECG recording done over a period of 24 or more hours. Electrodes are
attached to your chest and connected to a small portable ECG recorder by lead wires.
Holter monitoring may be done when an arrhythmia is suspected, but not seen on a
resting ECG. Arrhythmias may be transient in nature and not seen during the shorter
recording times of the resting ECG. You go about your daily activities, except those
that cause an excessive amount of sweating. This could cause the electrodes to become
loose or fall off during the procedure. These activities include taking a shower or
- Event monitor. This is similar to a Holter monitor, except that you start the ECG recording only
when you feel symptoms. Event monitors are typically worn longer than Holter monitors.
You can remove the monitor to shower or bathe.
- Mobile cardiac monitoring. This is similar to both a Holter and event monitor. The ECG is monitored constantly
to allow for detection of arrhythmias, which are recorded and sent to your doctor
regardless of whether you have symptoms. You can also start recordings yourself when
you have symptoms. These monitors can be worn up to 30 days.
- Implantable loop recorder. This is a miniature heart recording device that is implanted underneath the skin
overlying your heart. It can record the heart rhythm for up to 2 years and it useful
in diagnosing intermittent or rarely occurring arrhythmias.
How is an arrhythmia treated?
Some arrhythmias may cause few, if any, problems. In this case, you may not need treatment.
When the arrhythmia causes symptoms, you have several different choices for treatment.
Your healthcare provider will choose a treatment based on the type of arrhythmia you
have, how severe your symptoms are, and whether you have other conditions such as
diabetes, kidney failure, or heart failure. These can affect the course of the treatment.
Some treatments for arrhythmias include:
- Lifestyle changes. Stress, caffeine, and alcohol can cause arrhythmias. Your healthcare provider may
recommend that you avoid caffeine, alcohol, or any other things that may be causing
the problem. If your provider thinks that stress is a cause, he or she may recommend
meditation, stress-management classes, an exercise program, or psychotherapy to ease
- Medicine. Medicine is available to treat arrhythmias. Your healthcare provider will recommend
a medicine based on to the type of arrhythmia you have, whether you have other health
conditions, or whether you take other medicines.
- Cardioversion. In this procedure, the healthcare provider sends an electrical shock to your heart
through the chest. This will stop certain very fast arrhythmias such as atrial fibrillation,
supraventricular tachycardia, or atrial flutter. You are connected to an ECG monitor,
which is also connected to the defibrillator. The electrical shock is delivered at
the point during the ECG cycle to change the rhythm to a normal one.
- Ablation. This is an invasive but nonsurgical procedure done in the electrophysiology lab.
The healthcare provider puts a thin, flexible tube (catheter) into your heart through
a vessel in your groin or arm. The provider uses a method such as radio frequency
ablation to destroy the site of the arrhythmia. The procedure uses very high frequency
radio waves to heat the tissue until the site is destroyed. Cryoablation is another
procedure that is used. For this an ultra-cold substance is put on the site. This
freezes the tissue and destroys the site.
- Pacemaker. A permanent pacemaker is a small device that is put under the skin, often in the
chest region just under the collarbone. It sends electrical signals to start or regulate
a slow heartbeat. A permanent pacemaker may be used to make the heart beat if the
heart's natural pacemaker (the SA node) is not working as it should, or if the electrical
pathways are blocked. Pacemakers are often used for slow arrhythmias such as sinus
bradycardia, sick sinus syndrome, or heart block.
- Implantable cardioverter defibrillator (ICD). An ICD is a small device similar to a pacemaker. It is put under the skin, often
just under the collarbone. An ICD senses the rate of the heartbeat. When your heart
rate goes higher than the level entered into the device, it sends an electrical shock
to the heart. This corrects the rhythm to a slower, more normal heart rhythm. ICDs
are used with a pacemaker to send an electrical signal to regulate a slow heart rate.
ICDs are used for life-threatening fast arrhythmias such as ventricular tachycardia
or ventricular fibrillation.
- Surgery. Surgery is usually done only when all other treatments have failed. Surgical ablation
is a major surgery that needs general anesthesia. The surgeon opens your chest to
reach your heart. The surgeon destroys or removes the tissue causing the arrhythmia.
What are the complications of an arrhythmia?
Some arrhythmias have no complications. However, arrhythmias that are more serious
can result in heart failure, stroke, or even cardiac arrest.
Living with an arrhythmia
Living with an arrhythmia includes making lifestyle changes (avoiding caffeine, alcohol,
or other triggers) and taking medicines as directed. It may also include having a
pacemaker or implantable cardioverter defibrillator inserted. If you have a pacemaker
or implantable cardioverter defibrillator, make sure that you ask your healthcare
providers about any restrictions or lifestyle changes you may need to make. Working
with your provider can promote your health and well-being.
When should I call my healthcare provider?
Tell your healthcare provider if:
- Your symptoms get worse or you start to have new symptoms
- You have side effects from your medicine
- Need help with managing stress or emotions
Key points about arrhythmias
An arrhythmia is an abnormal heart rhythm.
- An arrhythmia can occur in the sinus node, the atria, or the atrioventricular node,
or the ventricle.
- Some arrhythmias cause few, if any, problems.
- Other arrhythmias can cause serious complications such as heart failure, stroke, or
even cardiac arrest.
- Many treatment options are available to treat arrhythmia, including medicines, devices,
cardiac ablation, and surgery. Many arrhythmias can be cured with procedures.
Tips to help you get the most from a visit to your healthcare provider:
- Know the reason for your visit and what you want to happen.
- Before your visit, write down questions you want answered.
- Bring someone with you to help you ask questions and remember what your provider tells
- At the visit, write down the name of a new diagnosis, and any new medicines, treatments,
or tests. Also write down any new instructions your provider gives you.
- Know why a new medicine or treatment is prescribed, and how it will help you. Also
know what the side effects are.
- Ask if your condition can be treated in other ways.
- Know why a test or procedure is recommended and what the results could mean.
- Know what to expect if you do not take the medicine or have the test or procedure.
- If you have a follow-up appointment, write down the date, time, and purpose for that
- Know how you can contact your provider if you have questions.