Atrial flutter is a type of supraventricular tachycardia (SVT). It is characterized by a rapid and regular heart rate, typically between 150-250 beats per minute. The atria of the heart beat in a sawtooth pattern, with large and rapid electrical impulses that cause the atrial chambers to contract. The ventricles of the heart then beat at their normal pace, typically around 60-100 beats per minute.
Atrial flutter is the opposite of bradycardia, or a slow heart rate. Bradycardia occurs when the heart rate is slower than 60 beats per minute. It can be caused by a number of conditions, such as heart disease, medications, or thyroid problems.
Atrial flutter can be very dangerous if left untreated, as it can cause blood clots to form in the heart or the lungs, potentially leading to a stroke or pulmonary embolism. Treatment options include medications, cardioversion, and ablation.
In summary, atrial flutter is a type of supraventricular tachycardia, characterized by a rapid and regular heart rate, and is not the same as bradycardia, which is a slow heart rate. Atrial flutter can be dangerous and should be treated promptly.