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embolism (em´bo-lizm)

Obstruction or occlusion of a vessel by an embolus. [G. embolisma, a piece or patch; lit. something thrust in]
air e. e. of air that can occur during cardiopulmonary bypass or with lung injury; either the pulmonary arteries or the systemic arteries can be filled with air.gas e;
amniotic fluid e. obstruction and constriction of pulmonary blood vessels by amniotic fluid entering the maternal circulation, causing obstetric shock. See also amniotic fluid syndrome.
atheroma e. cholesterol e
bland e. e. by simple nonseptic material.
bone marrow e. obstruction of a vessel by bone marrow, usually following fracture of a bone.
cellular e. e. due to a mass of cells transported from disintegrating tissue.
cholesterol e. e. of lipid debris from an ulcerated atheromatous deposit, generally from a large artery to small arterial branches; it is usually small and rarely causes infarction.atheroma e;
cotton-fiber e. e. by cotton fibers from sterile gauze used in intravenous medication or transfusion; may form as foreign body granulomas in small pulmonary arteries.
crossed e. 1. obstruction of a systemic artery by an embolus originating in the venous system which passes through a septal defect, patent foramen ovale, or other shunt to the arterial system; 2. obstruction by a minute embolism that passes through the pulmonary capillaries from the venous to the arterial system.paradoxical e;
direct e. e. occurring in the direction of the blood current.
fat e. the occurrence of fat globules in the circulation following fractures of a long bone, in burns, in parturition, and in association with fatty degeneration of the liver; the emboli most commonly block pulmonary or cerebral vessels when symptoms referable to either or both of these regions appear.oil e;
gas e. air e
hematogenous e. e. occurring in a blood vessel.
infective e. pyemic e
lymph e. , lymphogenous e. e. occurring in a lymphatic vessel.
miliary e. e. occurring simultaneously in a number of capillaries.multiple e. (1);
multiple e. 1. miliary e 2. e. caused by the arrest of a number of small emboli.
obturating e. complete closing of the lumen of a vessel by an embolism.
oil e. fat e
pantaloon e. saddle e
paradoxical e. crossed e
pulmonary e. e. of pulmonary arteries, most frequently by detached fragments of thrombus from a leg or pelvic vein, commonly when thrombosis has followed an operation or confinement to bed.
pyemic e. plugging of an artery by an embolus detached from a suppurating thrombus.infective e;
retinal e. e. of an artery of the retina.
retrograde e. e. of a vein by an embolus carried in a direction opposite to that of the normal blood current, after being diverted into a smaller vein.venous e;
riding e. straddling e
saddle e. a straddling e. at any vascular bifurcation, e.g., of the aorta which occludes both common iliac arteries.pantaloon e;
straddling e. e. occurring at the bifurcation of an artery and blocking more or less completely both branches.riding e;
tumor e. e. by neoplastic tissue transported from a tumor site and which may grow as a metastasis.
venous e. retrograde e


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