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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.
Size of this PNG preview of this SVG file: 480 × 350 pixels. ... ECG paper whose 1x1 mm squares measure 0.1 mV on the Y-axis and 0.40 ms on the X axis.
Schematic representation of a normal sinus rhythm EKG wave. In electrocardiography, the PR interval is the period, measured in milliseconds, that extends from the beginning of the P wave (the onset of atrial depolarization) until the beginning of the QRS complex (the onset of ventricular depolarization); it is normally between 120 and 200 ms in duration.
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 ...
Friction between the marking device and paper would reduce the accuracy of the measurements. Instruments with pneumatic, mechanical, or electromechanical amplifiers decoupled pen movement from process measurement, greatly increasing the sensitivity of the instrument and the flexibility of the recorder.
Original file (SVG file, nominally 660 × 391 pixels, file size: 15 KB) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
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File:ECG paper 12 leads.svg. Add languages. ... Original file (SVG file, nominally 4,605 × 2,452 pixels, file size: 28 KB) This is a file from the Wikimedia Commons.
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