Property | Value |
Name | What to the world Einthoven talking about? |
Description | Research article:-Cardiology Dr.T.Rajini Samuel* Cardiology Department, Venkataeswara Hospitals, 36-A Chamiers road, Nandanam, Chennai, India. *Presently doing M.D. Biochemistry in Sree Balaji Medical College and Hospital, Chromepet, Chennai. India.
Abstract:- Aims: To make people understand what Einthoven was really talking about. Methods and results: In the hex axial reference system of ecg, plot the net voltages of bipolar limb leads and connect them. Similarly, plot the net voltages of unipolar limb leads and connect them. Each forms equilateral triangles. Convert the equilateral triangles into circles. Each circle have same origin, same orientation, but different radii because the bipolar and unipolar limb leads have different resistance. The ratio of their resistance is 4/3. Hence the ratio of the area of the two circles is always constant and equal to 4/3. The square root of 4/3 is 1.154. The ratio of their radii is 1.154 .Multiply each unipolar limb lead voltages by 1.154 and then plot. The two equilateral triangles are on the same circle. The correction factor 1.154 is used because bipolar and unipolar limb leads have different resistance and the ratio of their resistance is 4/3. Thus heart is situated in the centre of the electric field which it generates. The two upper limbs and the left lower limb are the extensions of its electrical field. Voltage recorded in a particular lead is the result of dot product between the lead vector (measured in metre) and the cardiac vector measured in volt/metre. Hence voltage is a scalar quantity. The angle (α) determination from the ecg: Tan α= (1.154*avF)/ Lead 1 Conclusion: Einthoven triangle is an absolute electrical equilateral triangle. Each cardiac wave can be represented in the form of circles. Keywords:-Cardiac vector, Shifted Einthoven triangle.
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Filename | Samuel Rajini.pdf |
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Creator | admin |
Created On: | 10/04/2012 00:00 |
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Last updated on | 10/13/2012 08:16 |
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