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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.
Electrocardiography (ECG/EKG in German vernacular. Elektrokardiogram) monitors electrical activity of the heart, primarily as recorded from the skin surface. A 12 lead recording, recording the electrical activity in three planes, anterior, posterior, and lateral is the most commonly used form.
record heart electrical activity An implantable loop recorder ( ILR ), also known as an insertable cardiac monitor ( ICM ), is a small device that is implanted under the skin of the chest for cardiac monitoring , to record the heart's electrical activity for an extended period.
Cardiac surgery, or cardiovascular surgery, is surgery on the heart or great vessels performed by cardiac surgeons.It is often used to treat complications of ischemic heart disease (for example, with coronary artery bypass grafting); to correct congenital heart disease; or to treat valvular heart disease from various causes, including endocarditis, rheumatic heart disease, [1] and ...
The typical meaning of an "ECG" is the 12-lead ECG that uses 10 wires or electrodes to record the signal across the chest. Interpretation of an ECG is the basis of a number of cardiac diseases including myocardial infarction (heart attack) and arrhythmias such as atrial fibrillation .
Francisco Romero was a Spanish physician who became the first successful heart surgeon, [1] on record, by performing an open pericardiostomy to treat a pericardial effusion in 1801. He performed the first successful open heart surgery in history. [ 2 ]
The mean, normal SA in healthy young adult females and males is 66° and 80°, respectively, [9] and very similar magnitudes are found in the elderly population (65 years and older). [10] In ECG analysis, the SA is categorized into normal (below 105°), borderline abnormal (105–135°) and abnormal (greater than 135°). [11]
The QRS complex represents the conduction of the ventricles of the heart, the speed at which they are able to conduct an electrical impulse. The interval between each R wave represents the heart rate, which is critical for determining different rhythms within the defined categories. [citation needed]