Heart and circulation
The heart consists of two atrium (atria) and two chambers (ventricles) (see illustration ). Oxygen-poor blood enters the right atrium, passes into the right ventricle from where it is pumped into the pulmonary circulation. Here the blood oxygenated while it produces waste gas carbon dioxide that we exhale. The blood from the pulmonary circulation is collected and timber in the left atrium. From here it passes over the left ventricle from where it is pumped out of the body's large circulation via the aorta.
How does extrasystoles?
An extrasystole arises from a different area in the heart than the sinus node triggers an electrical impulse. This area may be located in the atria - we will afterwards have a so-called supraventricular extrasystole (SVES) - or it may be in the ventricles - we will then have a ventricular extrasystole (VES)sometimes this abnormal pacemaker trigger "ointments" of extrasystoles, i.e. multiple, rapid additional strokes in a row.
If the doctor can capture an extra stroke at the ECG, it will be easy to differentiate between a supraventricular and a ventricular extrasystole.
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