The Natural Pacemaker of the Heart
The part of the heart responsible for making heartbeats happen is the sinoatrial node (SA node). This node is the heart’s natural pacemaker. The SA node is a cluster of cells in the right atrium of the heart, which sends an electrical impulse to the walls of the atrial. This causes the heart to contract. It plays important role of regulating heartbeats by constantly firing impulses.
What Is Sinus arrhythmia?
Sinus arrhythmia encompasses disorders in the beating of the heart caused by the malfunctioning of the SA node. Arrhythmia is a term that describes an irregular heartbeat.
Conditions under sinus arrhythmia:
Sinus bradycardia is a type of sinus arrhythmia that is characterized by a slower than normal heartbeat. A person with sinus bradycardia typically has a heart rate of less than 60 beats per minute. A normal SA node should be able to fire at least 60 to 100 beats per minute.
A particular type of sinus bradycardia called physiologic sinus bradycardia. It is considered harmless, as it doesn’t cause any symptoms. This usually happens to athletes or children. However, sinus bradycardia that’s associated with other types of heart disease can be fatal. A slower than normal heartbeat can lead to reduced blood supply to the different parts of the body, leading to much more serious diseases or conditions.
Tachycardia is a condition where the heart beats faster than it normally would. A person with tachycardia usually has a heart rate of more than 100 beats per minute. Sometimes, a hastened heartbeat isn’t a sign of a disorder. The heartbeat can speed up due to many factors such as exercise or stress. However, tachycardia occurs even if there isn’t a reason for the heart to speed up.
The most common type of tachycardia is known as atrial fibrillation. This type of tachycardia is a “quivering” type of movement that results in the heart not being able to pump blood effectively.