The opening of the "valves" do not produce any sound because it is a slow process but closing of the valves produces sound, known as "heart sounds". These sounds are recorded by a special instrument known as stethoscope. The are of two types (1) "lubb" and (2) dupp. (1) "Lubb" (first heart sound) - It is of low amplitude, lasts longer and its caused by closure of valves between atria and ventricles (2) "Dupp" (second heart)- It is of high amplitude of short duration, and is caused by closure of aortic and pulmonary valves. The recording of heart sounds is referred to as "phonocardiograph".
ECG (Electro Cardio Graph)-refers to the recording of the electrical activity of the heart. It can be (a) resting ECG or (b) stress ECG (also known as Tread Mill Test or TMT).
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