![]() ![]() If a normal heart rhythm does not return quickly, blood circulation can cease, which can lead to death. The ventricles quiver instead of beating, resulting in poor blood supply to the body. Ventricular fibrillation (V-fib) is a serious cardiac disturbance. Long episodes can be very serious and need immediate medical attention. The cause and severity of the symptoms determine how serious it is. The speed of the heartbeat does not allow the ventricles to fill and contract properly, thereby reducing blood supply to the body. This can result from cardiovascular problems, such as a previous heart attack, the use of certain drugs, or a genetic condition leading to long QT. Ventricular tachycardiaĪbnormal electrical signals in the lower chambers result in a rapid heart rate. Many people have both A-fib and atrial flutter. This is similar to A-fib, but the rhythms are more organized. Consuming alcohol and smoking tobacco may contribute, as might hypertension and sleep apnea.Ītrial fibrillation can increase the risk of a stroke. It is more likely to affect those over the age of 65 years. Most people with A-fib also have another heart condition. This is known as atrial fibrillation (A-fib). This causes the chambers to contract rapidly and irregularly. Sometimes electrical activity in the atria can override the heart’s natural pacemaker. It is not usually serious, but in extreme cases, it can lead to unconsciousness and cardiac arrest. Many people first experience it between the ages of 25 and 40 years.Īn episode may last from a few minutes to several hours. It is the most common heart rhythm problem in children and young people. Atrial or supraventricular tachycardiaĪtrial or supraventricular tachycardia is an accelerated heart rhythm that starts in the upper chambers of the heart. A doctor may treat inappropriate sinus tachycardia with beta-blockers. Researchers say treatment is challenging because doctors understand so little about the cause. people with POTS (postural orthostasis tachycardia syndrome).Inappropriate sinus tachycardiaĭoctors do not understand fully what causes inappropriate sinus tachycardia, but neurological factors appear to play a role. infection, thyroid, or blood count problems.In this type, the heart beats faster than usual, but the rhythm is regular, and the impulse comes from the sinoatrial node. The following sections will outline some common types of tachycardia. When the ventricular muscles receive the electrical signals, they contract, pumping blood either to the lungs or to the rest of the body.Ī problem with the electrical signals can result in a faster-than-normal heartbeat. 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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