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 [...]
The following points highlight the seventeen important factors which influences coronary circulation in human beings. The factors are: 1. Mean Aortic Pressure 2. Cardiac Output 3. Metabolic Factors 4. CO2 and O2 5. Ions 6. Polypeptiedes 7. Adenine Nucleotides 8. Cardiac Sympathetic and Parasympathetic Nerves 9. Heart Rate 10. Hormones 11. Temperature 12. Muscular Exercise and Excitement 13. Anaemia and [...]