why is that ecg has PQRSTU waves and not other alpahbets?
Question:
Answers:
Because Einthoven, who discovered the principle started the label
He started with PQRS and T, U came later
Why PQRST and not ABCDE? The four deflections prior to the correction formula were labelled ABCD and the 5 derived deflections were labelled PQRST. The choice of P is a mathematical convention (as used also by Du Bois-Reymond in his galvanometer's 'disturbance curve' 50 years previously) by using letters from the second half of the alphabet. N has other meanings in mathematics and O is used for the origin of the Cartesian coordinates. In fact Einthoven used O . X to mark the timeline on his diagrams. P is simply the next letter. A lot of work had been undertaken to reveal the true electrical waveform of the ECG by eliminating the damping effect of the moving parts in the amplifiers and using correction formulae. If you look at the diagram in Einthoven's 1895 paper you will see how close it is to the string galvanometer recordings and the electrocardiograms we see today. The image of the PQRST diagram may have been striking enough to have been adopted by the researchers as a true representation of the underlying form. It would have then been logical to continue the same naming convention when the more advanced string galvanometer started creating electrocardiograms a few years later.
Other Answers:
Cause they used ABC for Airway, breathing, circulation and the other letters appropriate for history and physical!
I'm working as a respiratory therapist and I've been asking me the same question. Maybe its some mathematic formula? not sure I am a certified Cardiology tech and I never even asked that question.
I suppose being that I am used to algebra I naturally thought that the Doctor who made it just used any letter as in algebra.
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