![]() Though not usually life-threatening, the rapid, irregular and uncoordinated beating of the ventricles may cause light-headedness or palpitations. The pattern of electrical activity stimulates the atria randomly and at a high speed, which causes a series of very rapid contractions of the heart's upper chambers, preventing them from pumping effectively. ![]() This common form of tachycardia occurs when the electrical activity in the atria is disorganized and very rapid. Atrial flutter is usually not life threatening, but can cause chest pain, faintness or other more serious problems. This electrical signal causes the atria to "flutter," contracting at a much higher rate than normal. In atrial flutter, an extra or early electrical impulse travels around and around the atria in a circular path rather than down along its normal path. These are rapid heartbeats in the atria (the top chambers of your heart) or in the AV (atrioventricular) node – the electrical connection between the atria and the ventricles (the lower chambers of your heart).
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