These blood clots may increase the risk of stroke, should they detach and move through the bloodstream to the brain. For example, blood left behind in the upper chambers may pool, forming blood clots. These too-fast contractions in the heart’s upper chambers mean that blood does not pump efficiently to the lower chambers or throughout the body, leading to a number of potential serious complications. This would cause the heart rate to increase to 150 beats per minute, which is much higher than the normal range (60 to 100 beats per minute). For example, the upper chambers may contract 300 times per minute, while the lower chambers may contract 150 times per minute. When this happens, the heart’s upper chambers contract too fast for all the electrical impulses to conduct to the heart’s lower chambers. This causes the heart’s upper chambers to contract more often than they should, though the contractions may still occur at regular intervals. If a person has atrial flutter, the atria may develop an electrical loop, overwhelming the sinoatrial node. These electrical impulses help the heart muscle to contract in such a way that blood passes through its four chambers efficiently, then is sent throughout the body. When the heart functions normally, electrical impulses originate within the upper right-hand chamber of the heart, in an area called the sinoatrial node. Atrial flutter, a heart rhythm problem, occurs because of a malfunction in heart’s electrical system, leading to a faster-than-normal heart rate.
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