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Understanding Electrocardiography – By Dr. Gnana Sankaralingam   An electrocadiogram (ECG) is a recording of the electrical activity of the heart each time it contracts. Heart is a muscular organ whose purpose is to pump blood to tissues to supply them with oxygen. This is accomplished by four chambers, two smaller upper ones called Atria and two bigger lower ones Ventricles. Right atrium receives blood from the body while left atrium receives oxygenated blood from the lungs. They pump blood into right and left ventricles respectively. When ventricles contract, to prevent blood coming back to atria there are valves called mitral on left side and tricuspid on right side. Ventricles pump blood out of the heart, right to the lungs and left along entire circulatory system. To prevent blood returning back to ventricles there are valves, pulmonary on right side and aortic on left side. This is termed the cardiac ...