Created on 25 April 2019
Your heart does not move on your command, but it moves automatically, initiated by sinus node, located in right atrium. The cells in sinus node can generate electricity on their own and thus sending electrical impulses throughout the entire heart conducting system. From sinus node, the electricity will travel to AV node, and then it will be transmitted to the ventricles to generate heart muscle contraction.
Any normal heartbeat must be originated from the sinus node, and if not it means it’s abnormal or what we may call arrhythmia. But sometimes heartbeat originated from sinus node can also get the term “arrhythmia” if the impulses are too fast or too slow, depending on the sympathetic and parasympathetical activity in sinus node. If the heart beats faster than 100 times a minute, then it is called tachycardia. Heart beats slower than 60 times a minute may be called bradycardia, although some normal people may have less than 60 beats per minute, which usually found in people who are regularly exercise or trained athlete.
Any arrhythmia that cannot be treated by drugs may be treated with ablation, in purpose to destroy any electric-generating cells outside the sinus node that may cause heart doesn’t work properly, so that the sinus node get to control the heart rhythm again.