Tag: heart contraction

Impulses for heartbeat are created by the sinoatrial node when there are any pathological centers, the frequency of heart contraction gets off. Arrhythmia can proceed without special harm to an organism, giving only some inconvenience, but sometimes this disease happens dangerous. Such kind of arrhythmia as premature ventricular contraction meets 60-70% of people. It can be shown differently: in the form of tachycardia, vibration in