Types of Arrhythmia
There are a few common types of arrhythmia:
Premature (Extra) Beats
Premature extra heart beats are often harmless and usually do not cause
When symptoms do occur, however, they usually feel like fluttering in
the chest or a feeling of a skipped beat. Most of the time, premature
beats need no treatment, especially in healthy individuals.
Premature beats that occur in the atria are called premature atrial contractions,
or PACs. Premature beats that occur in the ventricles are called premature
ventricular contractions, or PVCs.
In most cases, premature beats occur naturally, not due to any heart disease.
But certain heart diseases can cause premature beats. They also can happen
because of stress, too much exercise, or too much caffeine or nicotine.
Supraventricular Tachycardia Arrhythmias
Supraventricular tachycardia (SVT) is any rapid heart rhythm originating
in the upper chambers of the heart. Some forms are called paroxysmal atrial
tachycardia (PAT) or paroxysmal supraventricular tachycardia (PSVT).
Common types of SVT include atrial fibrillation (AF), atrial flutter,
paroxysmal supraventricular tachycardia (PSVT), and Wolff-Parkinson-White
(WPW) syndrome. SVT is generally not life threatening, though it may cause
worsening heart function if it is sustained for hours.
Atrial fibrillation (AF) is the most common type of serious arrhythmia.
It's a very fast and irregular contraction of the atria.
In AF, the heart's electrical signal doesn't begin in the SA node.
Instead, the signal begins in another part of the atria or in the nearby
pulmonary veins and is conducted abnormally. When this happens, the electrical
signal doesn't travel through the normal pathways in the atria. Instead,
it spreads throughout the atria in a fast and disorganized manner. This
causes the walls of the atria to quiver very fast (fibrillate) instead
of beating normally. As a result, the atria aren't able to pump blood
into the ventricles the way they should.