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).
Tachycardia occurs when your heart beats too fast. The heart's electrical system normally sends signals from the upper chambers of the heart (atria) to the lower chambers (ventricles) in a pattern that causes a heartbeat, a coordinated contraction of the heart muscle. This is the slowing down or interruption of the electrical signal to the lower chambers of the heart which cause the heart muscle to contract. It can be treated with medication or with an electronic pacemaker. The resulting arrhythmia may be temporary or permanent. Some medications can also cause or aggravate a slow heartbeat. This condition may be caused by growing older or by disease. This is a malfunction in the heart's natural pacemaker (the sinus node), which makes it fire too slowly. An electronic pacemaker can help the heart to beat normally. Untreated bradycardia can cause excessive tiredness, dizziness, light-headedness or fainting. They include bradycardia and tachycardia, with a variety of conditions under those two categories.īradycardia occurs when your heart beats so slowly that it cannot pump enough blood for your body's needs. Arrhythmias are defined by the speed of the heartbeats: slow and fast.
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