![]() ![]() Small stickers (electrodes) are stuck to your arms, legs and chest, and connected via wires to an ECG machine.Įvery time your heart beats, it produces tiny electrical signals. If your GP suspects that you have supraventricular tachycardia (SVT), they may ask you to have an electrocardiogram and refer you to a heart specialist.Īn electrocardiogram (ECG) is a test that records the rhythm and electrical activity of your heart. The pulse felt at the wrist is due to the contraction of the ventricles. The AV node determines the rate of contraction of the ventricles. The impulse then continues through the AV node down fibres that conduct the impulse into the muscle of the ventricles. This sends out electrical impulses through the atrial muscle to another clump of cells called the atrioventricular (AV) node, found between the atria and ventricles. The control of the heartbeat starts with a small clump of cells in the right atrium, called the sinoatrial node (the heart's natural pacemaker). A heartbeat happens when this muscle suddenly contracts (tightens) so that the chambers become smaller and the blood inside is squeezed out. The atria and ventricles have walls of muscle. The heart has two upper chambers (the left and right atria) and two lower chambers (the left and right ventricles).
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