In this article we will discuss about the transmission of cardiac impulse of humans with the help of suitable diagram. 1. Conduction over Atrial Muscle: Cardiac impulse originated at the S.A node is transmitted over both the atria like concentric waves and thus the P wave is produced in E.C.G. (Electrocardiogram). The spread of electrical impulse through the S.A. node [...]
The following points highlight the three main electrocardiographic leads of human body. The leads are:- 1. Standard Limb Leads 2. Augmented Unipolar Limb Leads 3. Chest Leads. 1. Standard Limb Leads: The action current of the heart is recorded by placing two electrodes in two different positions in the body. (Fig. 7.62) Such arrangement of lead is called bipolar leads. [...]
Though Waller (1887) first recorded the electrocardiogram yet Einthoven (1903) was the real father of the electrocardiogÂraphy. His method of recording E.C.G. through string galvanometer was followed until 1930 when it was largely replaced by the amplifier - driven oscillograph provided with direct ink recording. PrinÂciples upon which the string galvanometer was based are as follows if an electrical current [...]