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The shape forms an inverted equilateral triangle with the heart at the center. It is named after Willem Einthoven, who theorized its existence. [2] Einthoven used these measuring points, by immersing the hands and feet in pails of salt water, as the contacts for his string galvanometer, the first practical ECG machine. [3]
Schematic diagram of normal sinus rhythm for a human heart as seen on ECG (with scales, isoelectric line and without wave labels) Date 23 September 2009, 12:50 (UTC)
Electrocardiography is the process of producing an electrocardiogram (ECG or EKG [a]), a recording of the heart's electrical activity through repeated cardiac cycles. [4] It is an electrogram of the heart which is a graph of voltage versus time of the electrical activity of the heart [ 5 ] using electrodes placed on the skin.
Wiggers diagram with mechanical (echo), electrical (ECG), and aortic pressure (catheter) waveforms, together with an in-ear dynamic pressure waveform measured using a novel infrasonic hemodynography technology, for a patient with severe aortic stenosis.
Schematic diagram of normal sinus rhythm for a human heart as seen on ECG, two periods forming a RR-interval. ... a human heart as seen on ECG (with Czech labels ...
English: A Wiggers diagram, showing the cardiac cycle events occuring in the left ventricle. In the atrial pressure plot: wave "a" corresponds to atrial contraction, wave "c" corresponds to an increase in pressure from the mitral valve bulging into the atrium after closure, and wave "v" corresponds to passive atrial filling.
Schematic diagram of sinus rhythm for a human heart as seen on ECG (with English labels). Date: 13 January 2007, 23:40: Source: SinusRhythmLabels.png: Author: Created by Agateller (Anthony Atkielski), converted to svg by atom. Other versions
Schematic representation of a normal sinus rhythm ECG wave. Diagram showing how the polarity of the QRS complex in leads I, II, and III can be used to estimate the heart's electrical axis in the frontal plane. The QRS complex is the combination of three of the graphical deflections seen on a typical electrocardiogram (ECG or EKG). It is usually ...