blockage
41retinal artery occlusion — blockage of an artery supplying blood to the retina, usually as a result of thrombosis or embolism. The central retinal artery enters the eye at the optic disc and then divides into branches to supply different parts of the retina. Blockage of… …
42retinal vein occlusion — blockage of a vein carrying blood from the retina. Small branch veins carry blood from different parts of the retina and drain into the central retinal vein, which leaves the eye at the optic disc. Blockage of the central retinal vein (central… …
43retinal artery occlusion — blockage of an artery supplying blood to the retina, usually as a result of thrombosis or embolism. The central retinal artery enters the eye at the optic disc and then divides into branches to supply different parts of the retina. Blockage of… …
44retinal vein occlusion — blockage of a vein carrying blood from the retina. Small branch veins carry blood from different parts of the retina and drain into the central retinal vein, which leaves the eye at the optic disc. Blockage of the central retinal vein (central… …
45lacrimal duct atresia — blockage of a lacrimal duct, as in congenital imperforation or with scar tissue …
46bowel obstruction — blockage in the lower intestines …
47airway obstruction — blockage of any of the passages by which air enters (and leaves) the lungs, which may be partial or complete. In partial obstruction, the patient can still move some air in and out of the lungs but often with difficulty. There may be a… …
48intestinal obstruction — blockage of the intestines producing symptoms of vomiting, distension, and abdominal pain; failure to pass flatus or faeces (complete constipation) is usual. The causes may be acute (e.g. hernia) or chronic (e.g. tumours, Crohn s disease).… …
49ileus — Blockage of the intestines iloprost A substance that is being studied in the prevention of lung cancer. It belongs to the family of drugs called prostaglandin analogs …
50obstruction — Blockage of a passageway …
