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Hi all, Willem Einthoven is credited with inventing String Galvanometer, but this is right way to say it:
In 1895 Dutch Physiologist, Willem Einthoven, used a crude electrical sensing apparatus to establish that the beating heart produced four distinct signals, each one corresponding to a different ventricle. He called these distinct signals the "PQRS" factors. However, Einthoven needed an exact way of measuring the minute amounts of current. In 1897 a French electrical engineer, Clement Ader, invented the "string galvanometer", containing a tensioned string of quartz. In 1903, Einthoven modified Ader's machine, adding electrodes attached to the patients limbs and thorax. In use the string was seen to vibrate in time with the patients heart. The vibrations were recorded photographically. With his "electrocardiogram" Einthoven was able to look at each of the PQRS signals and diagnose the health of the heart.
--Andreja 16:31, 22 February 2007 (UTC)
Electrocardiograph Versus Electrogram
I looked up the difference between the words "electrocardiograph" and "electrocardiogram" because I was confused as to which was the device and which was the output.
According to Wikipedia's public dictionary, the electrocardiograph is:
"An instrument used in the detection and diagnosis of heart abnormalities that measures electrical potentials on the body surface and generates a record of the electrical currents associated with heart muscle activity. Also called cardiograph."
and the definition of electrocardiogram is:
"A graphic recording of the electrical activity of the heart, used to evaluate cardiac function and to diagnose arrhythmias and other disorders. An electrocardiograph is the apparatus used to generate electrocardiograms. The machine functions as a portable set of galvanometers that measure electric potentials at different anatomic sites on the chest and extremities, and contains internal circuitry for computing calculations based on these measurements. Twelve electrodes act as transducers to pick up the electrical signals. Various combinations of signals from the electrodes can be selected for output, each of which provides information about electrical activity in the heart from a different anatomical perspective. For example, electrodes placed on the right arm, left leg and left arm record variations in potential in the frontal plane of the heart. The signals are converted to waveform tracings that are recorded and printed for diagnostic interpretation."
Therefore, I believe that the page should say that Einthoven invented the electrocardiograph and not the electrocardiogram. I'll leave that edit for those who maintain this page.
- James Dyson "A History of Great Inventions" ISBN 0-7867-0903-3