Electro Cardiogram and Its Normal Variations in Healthy Adults
Keywords:
Electro cardiogram, Bradycardia, Tachycardia, P-R interval, T Wave inversion, Incomplete RBBBAbstract
Background: Electro cardiogram is used to assess cardiac, rhythm and conduction and provides information about chamber size also. The Electrical activity is initiated in SA node and then to AV node and then to bundle of HIS and from that through the purkhji system spread to myocardium. Electrocardiogram is the best non-invasive investigation in diagnosing acute myocardial infarction and arrhythmias like atrial fibrillation and ventricular tachycardia. Electrolyte abnormalities like hypokalaemia and hyperkalaemia may also be detected with electrocardiogram. Aim: To study the normal variations QRS duration, ST, T changes and other rate and rhythm abnormalities, which can occur in healthy individuals. Subjects and Methods: We have examined 280 healthy adults , among those 280 ,120 were females and 160 were males. The age group is between 20 and 60 years. ECG’S were taken after Careful history and clinical examination to rule out any heart diseases like coronary heart diseases, rheumatic heart diseases and hypertensive heart diseases. Drug history was also recorded especially regarding B blockers and Calcium channel Blockers. Results: Out of 280, females were 120 and males were 160 the age group is between 20 and 60 years. The heart rate is between 56 and 104. Normal sinus rhythm is observed in 146. The increased heart rate is seen in young adults ,T↓ are very common. Conclusion: Electro cardiogram is a best investigation in diagnosing acute myocardial infarction and certain arrhythmias. Even though normal variations are common it is very much useful in detecting certain conditions like silent Myocardial infarction which is very common in diabetic patients and old age Individuals.
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References
1. Fried manH.H(1985) Diagnostic Electrocardiography and vectarocardiography new York. MC GrewHill Book Co.
2. Brody DA: Arybarcher R.C Woolsey M.D.et al. 1967. The normal atrial electrocardiogram. Morphological and quantities variability in bipolar leads Am. Heart J : 74,4.
3. Gordon R: Nialsan G.S Silverston H-(1965) electrocardiography P wave and atrial weight and volume Br. Heart – J. 27,748.
4. Wasser burger R.H. Alt W. J &Lloyed .C.J(1961) The normal RS. T segment elevation variant Am.J. cardiol. 8,184.
5. Goldman clinical electrocardiography, 1986-pp.132-36. 6. Dale Davis, ECG Interpretation 8th Edi- 57-59.
7. Fye WB. A History of the origin, and impact of electrocardiography. Am journal of cordial 1994:73:37-949.
8. Harrison’s Principle of internal medicine 18th Edi-PP.632-36. 9. An introduction electrocardiography – Leo Schamroth 1989-PP.33- 36.
10. Atterhof J.H and Loogna E.P.: R interval in relation to hart rate during exercise and the influence of posture and autonomic tone J. Electrocardiol 1977:10.331.
11. Lister J.W et al: Atrio Ventricular conduction in man : effect of rate exercise. Isoproterenol and Atropine on the P-R-Interval AM.J.Cardiol 1965:16.516.
12. Karki P, Bhadery S, Koirala. S, Singapore Med. J. Electrocardiographic mainfeslations Singapore Med.J.2004, 45,385- 89.
13. Mathus A. Swaroop. A. Electrocardiographic study in different poising. Indian heart journial- (1999;51:662).
