Cardiac Arrhythmia can be classified as:

1. Speed of the Heart

A rapid or fast heartbeat is when your heart is beating faster than normal. The normal heart rate is 50 to 100 beats per minute. Heartbeat can be faster or slower.

Faster (Tachycardia)

Tachycardia is considered a heart rate of greater than 100 beats per minute. If you are exercising or performing any kind of activity, your heart will normally beat faster. This allows your heart to pump blood throughout your body, to provide oxygen to the tissues.

Slower (Bradycardia)

Bradycardia is a slower heart rate than normal heart rate. If one has bradycardia, his/her heartbeats fewer than 50 beats per minute. Bradycardia can be a serious problem if the heart doesn’t pump enough oxygen-rich blood to the body.

2. Related to Upper Chambers (Atria)

The abnormal rapid rhythms that start in the upper chambers of the heart (the atria) are called Atrial Arrhythmias. Several kinds of abnormal heart rhythm (arrhythmia) occur in the heart’s upper chambers (the atria). The most common include:

Atrial Fibrillation

During atrial fibrillation, the heart’s two upper chambers (the atria) beat irregularly. The heart rate ranges between 100-200 beats per minute.

Atrial Flutter

Atrial Flutter is a problem in which the heart beats very fast. The atria beat regularly, but faster than usual. The heart rate is more than 250 beats per minute.

Supraventricular Arrhythmias

Arrhythmias that begin in the atria (the heart’s upper chambers). “Supra” means above; “ventricular” refers to the lower chambers of the heart or ventricles. SVT is defined as the abnormal fast heartbeat that originates above the ventricles in the atria.

3. Related to Lower Chambers (Ventricles)

The abnormal rapid rhythms that start in the lower chambers of the heart (the ventricles) are called Ventricular Arrhythmias. These types of arrhythmias cause your heart to beat too fast, which prevents oxygen-rich blood from circulating to the brain and body and may result in cardiac arrest.  

Ventricular Tachycardia 

Ventricular Tachycardia is a condition in which the heartbeat is very fast but often regular. The rates are most commonly 150 to 250 beats per minute but ventricular tachycardia may occur at relatively slow rates such as 110 to 150 beats per minute, sometimes due to medications that slow the ventricular tachycardia or advanced degrees of heart impairment. 

Ventricular fibrillation 

Ventricular fibrillation is an extremely rapid heartbeat occurring in the lower heart chambers, usually at over 300 beats per minute. The heart pumps little or no blood. Ventricular Fibrillation quickly leads to cardiac arrest.

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