![]() In doing so, it allows time for the ventricles to fill with blood. The AV node slows down the electrical signals and then sends them on to the ventricles. The electrical impulses continue to the atrioventricular (AV) node, which is a cluster of cells. This contraction pushes blood into the ventricles. Each one triggers an individual heartbeat.Īs the electrical impulses leave the sinoatrial node, they cross the atria, making the atrial muscles contract. The heart has a natural pacemaker, called the sinoatrial node, in the right atrium. There are left and right atria and ventricles. The human heart consists of four chambers: the atria, which are the two upper chambers, and the ventricles, which are the two lower chambers. What is arrhythmia? Atria, ventricles, and the electrical circuitry of the heart This is called tachycardia-induced cardiomyopathy. When the muscle is beating too fast, it can cause weakening or “tiring out” of the heart muscle over time. The pressure in the lungs can also go up, leading to fluid accumulation. Blood flow to the rest of the body, including the heart, reduces. When the heart beats too rapidly, it pumps less efficiently. When tachycardia is present, either the upper or lower chambers - or both - beat significantly faster. Some people can also have an exaggerated response to exercise, and that is also considered a type of tachycardia. Factors such as age and fitness levels can affect it. In adults, the heart usually beats between 60 and 100 times per minute.ĭoctors usually consider a heart rate of over 100 beats per minute to be too fast. Tachycardia refers to a high resting heart rate. Share on Pinterest Image Credit: dusanpetkovic/Getty Images
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