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 [...]
In this article we will discuss about the changes which occurs in cardiovascular system during exercise. I. Heart and Exercise: Prolonged and systematic exercise causes enlargement of the heart, and this is happens only to cope with the excessive work load imposed upon the heart during work. There is a lot of misunderÂstanding that prolonged exercise may cause dilatation of [...]