What Are the Types of Arrhythmias?
An arrhythmia is an irregular heartbeat, and it can be caused by a variety of processes and problems with the heart, for example, heart disease, injury from a heart attack, or healing after heart surgery. Even people with healthy hearts can have irregular heart rhythms. There are a variety of types of arrhythmias (abnormal heart beat), for example:
- Premature ventricular contractions or PVCs
- Atrial fibrillation
- Atrial flutter
- Certain types of tachycardias
- Ventricular fibrillation
- Long QT syndrome
- Heart block
What is atrial flutter, and what is atrial fibrillation (definitions)?
Atrial flutter is a type of atrial tachycardia that results in an arrhythmia
(rhythm disorder or not a normal rhythm) where the atria of the heart beat too
quickly in a fast, usually regular, rhythm.
Atrial fibrillation is
another type of atrial tachycardia that is closely related to atrial flutter.
However, the arrhythmia that occurs in AFib is much more chaotic
and results in a fast and usually very irregular heart rhythm or a atypical and
irregular ventricular rate that can effect heart health.
Are atrial flutter, atrial tachycardia, and atrial fibrillation the same thing?
Atrial flutter, atrial fibrillation (AFib), and atrial tachycardia are not the same
things. However, all three terms have in common a rapid heart rate that can be
felt when a person feels their pulse. Atrial tachycardia is a general term that
indicates a cardiac condition where the rate of contraction of the heart's atria
is fast and not normal, but does not describe the type of heart rhythm other than
fast. Atrial tachycardia's are also termed supraventricular tachycardia's and
are a type of
cardiac arrhythmia that usually result in a fast heartbeat, even
In contrast, atrial flutter and AFib are two of the main types
of atrial tachycardia. They are distinguished by the different patterns of
abnormal electrical impulses generated in the atria; a regular pattern for
atrial flutter and an irregular pattern for AFib. Both are
considered an abnormal heart rhythm and not good for heart health, and both have
the potential to decrease the overall health of the patient.
What are the differences in how atrial flutter and AFib affect the heart (ECG wave strip patterns)?
What does ECG and electrical conduction of a normal heart look like?
Normal Cross Section of the Heart and Its Electrical Conduction ECG strip of Normal Heart Rhythm
Atrial flutter ECG
Atrial flutter is a health condition that causes the atria of the heart to have a conduction or electrical problem that result in a re-entry loop in a regular pattern the causes the atria to beat at a rapid rate of about 240-360 beats per minute (bpm). The atrial flutter waves are regular and on an electrocardiogram (ECG, EKG) are seen as P waves in a regular "saw tooth" pattern (small P waves in succession with short or no intervals between each wave). Often, the flutter waves are not completely transferred through the AV node to the ventricular heart chambers so occasionally electrical conduction blocks occur and produce a 2:1, 3:1 or 4:1 ventricular contraction rate that is mainly regular. The most common atrial flutter occurs when the atria beat at a rate of 300 bpm and ventricular contraction rate is 150 bpm (2:1 conduction). Infrequently, some patients with flutter waves may also have bradycardia because the heart's ventricles are not receiving most of the flutter P waves. Flutter waves may come and go spontaneously in some patients. Atrial flutter is the second most common tachyarrhythmia.
ECG sawtooth wave pattern of atrial flutter
ECG Strip: Sawtooth Wave Pattern of Atrial Flutter
Atrial fibrillation is the most common tachyarrhythmia. The incidence is about 27-28 per 1000 person years. AFib is a heart disease that causes the atria of the heart to have a conduction or electrical problem that results in a chaotic, irregular production of irregular QRS waves with no P waves. In contrast to flutter waves, the abnormal conduction creates irregular, rapid occurring QRS waves, some of which are conducted to the heart ventricles through the AV node. This results in the heart having ventricular contractions that are irregular, variable in effective blood pumping and usually range from about 100-175 bpm.
What does ECG and abnormal electrical conduction of atrial fibrillation look like?
ECG of the heart's abnormal electrical problem in AFib
ECG of the Abnormal Conduction of the Hear'ts Electrical System in AFib
ECG strip showing abnormal wave pattern of atrial fibrillation
Picture of the heart's abnormal electrical conduction in AFib
Picture of the Heart's Abnormal Electrical Conduction in AFib
Which heart condition is more serious, atrial flutter or atrial fibrillation?
Both heart diseases have the potential of becoming serious. However, many
doctors and other health care professionals consider atrial flutter to be less serious than atrial fibrillation
because flutter symptoms tend to be less severe and flutter waves have a less
risk of embolization (clot formation). In addition, flutter waves also tend to
revert back to sinus rhythm spontaneously more often in some patients.
What's the difference between how these two heart conditions feel (symptoms);
can you feel atrial flutter and/or atrial fibrillation?
The difference between atrial flutter and AFib in terms of
feeling are very similar. However, if the person can have someone (or even
themselves) feel a pulse, if the pulse is regular even though it's fast, the
problem is probably atrial flutter. If the pulse is fast and irregular, then
the person is more likely to have AFib.
Although some people have no symptoms and cannot feel the arrhythmias, common
clinical symptoms of both arrhythmias are:
Serious symptoms may include the following:
Medically Reviewed by a Doctor on 3/23/2017