lundi 23 juin 2014

Abnormal Heart Rhythms (arrhythmias)

Abnormal Heart Rhythms (arrhythmias)

Abnormal Heart Rhythms (arrhythmias)
Abnormal heart rhythms (arrhythmias) ar sequences of heartbeats that ar irregular. they're too quick, too slow, or conducted via associate degree abnormal electrical pathway through the guts. Heart rhythms take issue from one person to the opposite. Health, age and fitness ar usually key factors.

The heart could be a muscular organ with four chambers, designed to figure with efficiency, reliably, and unendingly over a life. The muscular walls of every chamber go for a regulated sequence, pumping blood PRN by the body whereas outlay as very little energy as attainable throughout every heartbeat.

Contraction of the muscle fibers among the guts is controlled by electricity. This flows through the guts in a very precise manner, on distinct pathways and at a controlled speed. The electrical current that begins every heartbeat, originates within the
 heart's pacemaker, situated within the high of the higher right heart chamber (right atrium). the speed at that the pacemaker discharges the electrical current determines the guts rate. This rate is influenced by nerve impulses and levels of sure hormones among the blood.

The heart rate is regulated mechanically by the involuntary system, that consists of the sympathetic and parasympathetic divisions. The sympathetic division will increase the guts rate through a network of nerves known as the sympathetic body structure. The parasympathetic division decreases the guts rate through one nerve, the cranial nerve.

In associate degree adult at rest, the guts rate is sometimes between sixty and 100
 beats per minute. However, lower rates could also be traditional in young adults, notably those that ar physically work. somebody's vital sign varies unremarkably in response to exercise and such stimuli as pain and anger. regular recurrence is taken into account abnormal only the guts rate is unsuitably quick (known as tachycardia) or slow (known as bradycardia), or is irregular, or once electrical impulses follow abnormal pathways. 

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