Irregular Cardiovascular Rhythms (arrhythmias)
Abnormal heart rhythms (arrhythmias) are sequences of heartbeats that are irregular. They are too fast, too slow, or conducted via an abnormal electrical pathway through the heart. Heart rhythms differ from 1 person to the other. Well being, age and fitness are frequently key aspects.
The heart is actually 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 necessary by the body even though expending as small energy as feasible 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 present that begins each heartbeat, originates inside the heart’s pacemaker, situated within the leading of the upper suitable heart chamber (right 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 particular 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 means of a network of nerves referred to 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 1 hundred beats per minute. However, lower rates may possibly be normal in young adults, especially people who are physically fit. A person’s heart rate varies generally in response to physical exercise and such stimuli as pain and anger. Heart rhythm is considered abnormal only when the heart rate is inappropriately fast (called tachycardia) or slow (referred to as bradycardia), or is irregular, or when electrical impulses travel along abnormal pathways.
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