| RC | an electronic circuit containing a resistor and capacitor in series; radiocarpal; reaction center; r... |
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| RCT | radiotherapy and chemotherapy; randomized clinical trial; randomized controlled trial; registered ca... |
| REP | replication protein; rest-exercise program; retrograde pyelogram; roentgen equivalent-physical |
| RFC | request for comments; retrograde femoral catheter; rosette-forming cell |
| RGP | retrograde pyelography |
| paradoxical embolism | Passage of a clot (thrombus) from a vein to an artery. When clots in veins break off (embolise) , they travel first to the right side of the heart and, normally, then to the lungs where they lodge. The lungs act as a filter to prevent the clots from entering the arterial circulation. However, when there is a hole in the wall between the two upper chambers of the heart (an atrial septal defect), a clot can cross from the right to the left side of the heart, then pass into the arteries as a paradoxical embolism. Once in the arterial circulation, a clot can travel to the brain, block a vessel there, and cause a stroke (cerebrovascular accident). Because of the risk of stroke from paradoxical embolism, it is usually recommended that even small atrial septal defects be repaired. Also called crossed embolism. (12 Dec 1998) |
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| venous embolism | Embolism 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. Synonym: venous embolism. (05 Mar 2000) |
| cellular embolism | Embolism due to a mass of cells transported from disintegrating tissue. (05 Mar 2000) |
| cerebral embolism and thrombosis | Embolism or thrombosis occurring in a cerebral vessel often leading to cerebral infarction. (12 Dec 1998) |
| retinal embolism | Embolism of an artery of the retina. (05 Mar 2000) |
| riding embolism | Embolism occurring at the bifurcation of an artery and blocking more or less completely both branches. Synonym: riding embolism. (05 Mar 2000) |
| cholesterol embolism | Embolism 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. Synonym: atheroma embolism. (05 Mar 2000) |
| miliary embolism | Embolism occurring simultaneously in a number of capillaries. Synonym: multiple embolism. (05 Mar 2000) |
| multiple embolism | Embolism caused by the arrest of a number of small emboli. (05 Mar 2000) |
| cotton-fibre embolism | Embolism by cotton fibres from sterile gauze used in intravenous medication or transfusion; may form as foreign body granulomas in small pulmonary arteries. (05 Mar 2000) |
| crossed embolism | Passage of a clot (thrombus) from a vein to an artery. When clots in veins break off (embolise) , they travel first to the right side of the heart and, normally, then to the lungs where they lodge. The lungs act as a filter to prevent the clots from entering the arterial circulation. However, when there is a hole in the wall between the two upper chambers of the heart (an atrial septal defect), a clot can crossparadoxically from the right to the left side of the heart, then pass into the arteries. Once in the arterial circulation, a clot can travel to the brain, block a vessel there, and cause a stroke (cerebrovascular accident). Because of the risk of stroke from crossed embolism, it is usually recommended that even small atrial septal defects be closed (repaired). Also called: paradoxical embolism. (12 Dec 1998) |
| haematogenous embolism | Embolism occurring in a blood vessel. (05 Mar 2000) |
| saddle embolism | A straddling embolism at any vascular bifurcation, e.g., of the aorta which occludes both common iliac arteries. Synonym: pantaloon embolism. (05 Mar 2000) |
| pulmonary embolism | <cardiology> The lodgment of a blood clot in the lumen of a pulmonary artery, causing a severe dysfunction in respiratory function. Pulmonary emboli often have origin in the veins of the lower extremities where clots form in the deep leg veins and then travel to the lungs via the venous circulation. Symptoms and features include acute onset of shortness of breath, chest pain (worse with breathing) and rapid heart rate and respiratory rate. Some individuals may have haemoptysis. Diagnosis can be made on a ventilation perfusion scan of the lung or on a pulmonary angiogram. (15 Dec 1997) |
| pulmonary embolism: findings | <radiology> Embolism without infarction (90%), normal chest (25%), platelike atelactasis, Westermark sign, knuckle sign, local widening of artery by impacted embolus, segmental / lobar consolidation, pleural effusion embolism with infarction (10%), wedge-shaped consolidation (50%), may cavitate, Hampton hump, pleural effusion (50%), no air-bronchogram, melting sign, Fleischner lines, platelike atelactasis (25%), cardiomegaly / congestive heart failure (20%), elevated hemidiaphragm (20%) see: pulmonary embolism (12 Dec 1998) |