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ECG terminology E-I

Femoral artery Main Blood vessel supplying blood to the leg
Fibrillation Uncoordinated contractions of the heart muscle occurring when the individual muscle fibers take up independent irregular contractions.
Gallop rhythm an extra, clearly heard heart sound which, when the heart rate is fast, resembles a horse's gallop. it may or may not be significant.
heart block Interference with the conduction of the electrical impulses of the heart which can be either partial or complete. This can result in dissociation of the rhythms of the upper and lower heart chambers.
Heart-lung machine A machine through which the blood stream is diverted for pumping and oxygenation while the heart is opened for surgery.
Hemodynamics The study of the flow of blood and forces involved
Hemorrhage Loss of blood from a blood vessel. In external hemorrhage blood escapes from the body. In internal hemorrhage blood passes into tissues surrounding the ruptures blood vessel.
Heparin A chemical substance which tends to prevent blood from clotting. An anticoagulant
His, Wilhelm German anatomist who discovered bundle of muscle fibers running from the upper to lower chambers of the heart. These fibers are known as Bundle of his
Hypertension High Blood pressure. An unstable or persistent elevation of blood pressure above the normal range, which may eventually lead to increased heart size and kidney damage.
Hypotension Low blood pressure, Blood pressure below the normal range. Most commonly used to describe an acute fall in blood pressure as occurs in shock
Hypoxia Less than normal content of oxygen in the organs and tissues of the body.
Incompetent valve Any valve which does not close tight and leaks blood back in the wrong direction. Also called valvular insufficiency
Infarct An area of a tissue which is damaged or dies as a result of not receiving a sufficient blood supply. Also called myocardial infarct
inter-atrial septum Sometimes called auricular septum or interauricular septum or atrial septum. Muscular wall diving left and right upper chambers of the heart which are called atria
Inter-ventricular septum Sometimes called ventricular septum. Muscular wall thinner at the top, dividing the left and right lower chambers of the heart which are called ventricles
Ischemia A local, usually temporary, deficiency of blood in some part of the body, often caused by a constriction or an obstruction in the blood vessel supplying that part