Cardiac arrhythmias are changes in the normal heart rhythm or heart rate. It is a disorder that affects the heart's electrical system that can occur in any part of the heart muscle. This change will make the heart beat too fast, too slow or irregular.
During an arrhythmia, the heart can not pump enough blood to the body. This lack of blood flow can damage the brain, the heart and other organs.
The heartbeat originates at regular intervals and their frequency increases or decreases depending on the energy needed by the body cells to function.
The start pulse is produced by an electrical stimulation by the sinus node. This activates the atria and the ventricles happens next, a synchronized rhythm to drive energy efficiency when the heart muscle contracts.
The sinus node is a natural pacemaker, originating the normal heart rhythm (sinus rhythm). This small device provides a regular heart beat and proper contraction. Is on top of the right atrium.
Causes an electrical signal that is transmitted through a circuit. First passes the atria and the ventricles after the atrioventricular node (in english) (nodo OF), located between the upper and lower chambers. The electrical signal passes to the right and left ventricle through the branches of driving right and left.
What causes arrhythmias?
Like any circuit, promoting this kind of grid may be disturbed so the beats have been caused in a normal manner, descoordinando contraction of the heart muscle causing it to contract in an anarchic and chaotic.
Arrhythmias can range from harmless to serious, and even cause death.
Each type has its own cause arrhythmia: can be produced by a genetic component, by heart disease (a problem in the coronary arteries, heart failure or malfunction of valves) or certain medications. Also excessive alcohol consumption, snuff, stress or intense exercise can cause you to alter the normal heart rhythm, resulting in an arrhythmia.
Symptoms of arrhythmias:
Like most heart disease, arrhythmias symptoms may vary from person to person and depending on the type of arrhythmia. It is possible that in some cases, arrhythmias can also occur without symptoms.
Symptoms are usually intermittent, but the most common are:
Types of arrhythmias:
There are a wide variety of arrhythmias, which can be classified based on heart rate:
Also are classified into four main types of arrhythmia: extrasystoles, supraventricular arrhythmias, ventricular arrhythmias and bradyarrhythmias. Most arrhythmias are harmless, but depends on the type and severity of arrhythmia. Should be studied in people with health problems.
It is important that arrhythmias are diagnosed and treated early, because they are responsible for numerous deaths in the US annually sudden death.