OFG (Abbr) Orophacial granulomatosis
Ogilvie´s Syndrome False obstruction of the colon, giving signs and symptoms of large bowel obstruction without any real organic reason. This syndrome was initially described by H Ogilvie ein 1948, and he suggested that the syndrome was caused by a deprivation of the sympathetic nerves.
OMED Organisation Mondiale d´Endoscopie Digestive (the World Organization of Digestive Endoscopy)
Omeprazole test Giving a test dose of 80 mg of omeprazole to a patient with unexplained chest pain, in order to find out if reflux disease is the cause of the pain. Introduced in 1992.
OMGE (Abbr) Organisation Mondiale de Gastro-Enterologie (the World Organization of Gastroentelogy)
Onco- (pre) Tumor-
Oncogene A gene causing or contributing to cancer
Onkos (Gre) Tumor
Ono´s sign Coughing when swallowing liquids when upright och lying on one side, due to an oesophagorespiratory fistula.
Oppenheimer, Gordon D An american physician who together with Burrill B. Crohn and Leon Ginzburg in 1931 published an article about termnal ileitis, a disease since then known as Crohn´s disease.
Opisthorchiasis (Cat liver fluke) Infection by one of the liver flukes, Opisthorchis felineus or Opisthorchis viverrini, in the intra- and or extra-hepatic bile ducts. This infectionocxcur in the southern Europe and in Siberia, and it is quite common in some parts of the former USSR. The viverrini-type is found in Thailand and Laos. Longterm infection can cause biliary symptoms, some time severe cholangitis. Treatment with praziquantel is used, and in mild or moderately severe infections the prognosis is good.
Oriental cholangiohepatitis An inflammation in the liver and bile ducts caused by infection with Clonorchis sinenis, a liver fluke. The infection carries an elevated risk of cholangiocarcinoma, cancer in the bile ducts.
Oro- (pre) Concerning the mouth
Orofacial granulomatosis A syndrome the typical presentations of which are swelling of the lips and oral tissue, and the face, with histologic finding of granulomatous inflammation in these regions. This syndrome can be a manifestation of Crohn´s disease.
Oropharyngeal dysphagia Swallowing difficulty, where initiating the swallowing reflex is the main problem. Neurological disorders (e.g. stroke) kan cause this type of dysphagia.
ORS Oral Rehydration Solution, a solution used in the treatment of diarrhea in order to treat and prevent dehydration.
Orthorexia nervosa A newly identified eating disorder, where the patient has an unhealthy fixation on eating healthy food. This condition, identified by dr Steven Bratman, USA, in 1997, is probably as common as the other eating disorders, anorexia nervosa and bulimia nervosa.
Osler´s disease A hereditary syndrome causing multiple telangiectasias on the skin and in the mucosa of mainly the gastrointestinal channel.
Osm (Abbr) Osmole(s)
Osteoma Benign tumour-like bony growths in the skeletal system, most frequently however in the skull and the mandible. Osteomas are a typical finding in Gardner´s syndrome, a subgroup of the familial adenomatous polyposis-syndrome.
Osteoporosis A skeletal disease characterized by low bone mass and deterioration of bone tisse, with an increased risk of fractures. Postmenopausal osteoporosis is the main form of primary osteoporosis. Secundary osteoporosis may be do to coeliac disease. Cortison therapy over 6 months can cause osteoporosis.
Ostomy An artificial, surgically created, temporary or permanent opening between an internal organ (for example the intestine) and the body surface. Typical ostomies are ileostomy (an opening between the distal small bowel and the skin) and colostomy (an opening between the large bowel and the skin). Synonym: Stoma
OTC-drug "Over the counter"-drug, a drug that can be bought in a pharmacy without any prescription
Ounce Weight measure, measuring mass. 1 ounce is 28.35 grams. 1 g is 0.0353 ounces.
Out-patient A patient that is treated in a hospital without being admitted to a bed in a hospital ward.
Overlap syndrome A chronic liver disease with features resembling both autoimmune hepatitis and primary biliary corrhosis.