How the heart works, and how it can cause sudden death In order to understand why sudden death can happen, it helps to understand how the heart works. The heart is a specialised muscle that contracts regularly and continuously, pumping blood to the body and the lungs. The pumping action is caused by a flow of electricity through the heart that repeats itself in a cycle. If this electrical activity is disrupted - for example by a disturbance in the heart's rhythm known as an 'arrhythmia' - it can affect the heart's ability to pump properly.
The heart has four chambers - two at the top (the atria) and two at the bottom (the ventricles). The normal trigger for the heart to contract arises from the heart's natural pacemaker, the SA node, which is in the top chamber (see the diagram, right). The SA node sends out regular electrical impulses causing the atrium to contract and to pump blood into the bottom chamber (the ventricle).
The electrical impulse then passes to the ventricles through a form of 'junction box' called the AV node (atrio-ventricular node). This electrical impulse spreads into the ventricles, causing the muscle to contract and to pump blood to the lungs and the body. Chemicals which circulate in the blood, and which are released by the nerves that regulate the heart, alter the speed of the pacemaker and the force of the pumping action of the ventricles. For example, adrenaline increases the heart rate and the volume of blood pumped by the heart
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Hi,
The heart is a strong muscle that pumps blood around the body. The heart muscle needs oxygen to work. Most heart attacks are caused by ischaemic heart disease (IHD), which means the heart muscle is not getting enough oxygen. It is similar to an acutely painful cramp a person may get in the muscles of the arms or legs when doing vigorous exercise. It is very painful but doesn't do lasting damage to the muscle. People often refer to that pain as "angina." It is due to narrowing of the arteries by the formation of fatty plaques. But if these fatty plaques crack and a clot forms in the artery, it can be blocked off completely, starving the muscle of oxygen irreversibly and causing the muscle to die. That process is called a heart attack. Although doctors can try to clear the blockage quickly, some damage will inevitably be done.
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Baiju Dixit -- One Health Conscious Guy
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