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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.
Procedure on single vessel Number of vessels, unspecified Procedure on two vessels Procedure on three vessels Procedure on four or more vessels (00.44) Procedure on vessel bifurcation (00.45) Insertion of one vascular stent. Number of stents, unspecified Insertion of two vascular stents
SAECG recording yields a single, averaged QRS potential, usually printed in a much larger scale than standard ECGs, upon which the SAECG software performs calculations to reveal small variations (typically 1-25 uV) in the final portion of the QRS complex (the so-called "late potentials, or more accurately, "late ventricular potentials").
Before the development of the Bruce protocol there was no safe, standardized protocol that could be used to monitor cardiac function in exercising patients. Master's two-step test [7] was often used, but it was too strenuous for many patients, and inadequate for the assessment of respiratory and circulatory function during varying amounts of ...
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For each fever degree Celsius an increase of 8 beats per minute in cardiac frequency Lisch nodule: Karl Lisch: ophthalmology: type I neurofibromatosis: yellow brown hamartomata on iris Lisker's sign? internal medicine: deep venous thrombosis (needed) tenderness on percussion of antero-medial tibia Litten's sign: Moritz Litten: cardiology ...
In humans, for an ECG to be described as showing a sinus rhythm, the shape of the P wave in each of the 12 standard ECG leads should be consistent with a "typical P vector" of +50° to +80°. [2] This means that the P wave should be: always positive in lead I, lead II, and aVF; always negative in lead aVR
Cardioversion is a medical procedure by which an abnormally fast heart rate (tachycardia) or other cardiac arrhythmia is converted to a normal rhythm using electricity or drugs. Synchronized electrical cardioversion uses a therapeutic dose of electric current to the heart at a specific moment in the cardiac cycle , restoring the activity of the ...