Abnormal heart rhythms (arrhythmias) are sequences of heartbeats which are irregular. They are too quickly, too slow, or conducted via an abnormal electrical pathway by way of the heart. Heart rhythms differ from one individual to the other. Health, age and fitness are generally key aspects.
The heart is really a muscular organ with four chambers, designed to work efficiently, reliably, and continuously over a lifetime. The muscular walls of each and every chamber contract in a regulated sequence, pumping blood as needed by the body whilst expending as small energy as possible throughout each and every heartbeat.
Contraction of the muscle fibers inside the heart is controlled by electricity. This flows by way of the heart in a precise manner, along distinct pathways and at a controlled speed. The electrical existing that begins each heartbeat, originates within the heart's pacemaker, situated inside the top of the upper suitable heart chamber (appropriate atrium). The rate at which the pacemaker discharges the electrical existing determines the heart rate. This rate is influenced by nerve impulses and levels of certain hormones inside the bloodstream.
The heart rate is regulated automatically by the autonomic nervous method, which consists of the sympathetic and parasympathetic divisions. The sympathetic division increases the heart rate by way of a network of nerves known as the sympathetic plexus. The parasympathetic division decreases the heart rate through a single nerve, the vagus nerve.
In an adult at rest, the heart rate is typically between sixty and one hundred beats per minute. Nonetheless, lower rates may possibly be normal in young adults, particularly those who are physically fit. A person's heart rate varies generally in response to exercise and such stimuli as pain and anger. Heart rhythm is considered abnormal only when the heart rate is inappropriately quick (referred to as tachycardia) or slow (known as bradycardia), or is irregular, or when electrical impulses travel along abnormal pathways.
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