| arterial hypotension | See: hypotension. (05 Mar 2000) |
|---|---|
| controlled hypotension | Deliberate acute reduction of arterial blood pressure to reduce operative blood loss by pharmacologic means during anaesthesia and surgery. (05 Mar 2000) |
| postural hypotension | <cardiology> The manifestation of low blood pressure when rising from a chair or bed. A drop in blood pressure that is precipitated by changes in body position. May be related to hydration status, drug side effect or be caused by a dysfunction in the autonomic nervous systems ability to maintain blood pressure with positional changes (for example autonomic neuropathy secondary to diabetes). (27 Sep 1997) |
| hypotension | <cardiology, physiology> Abnormally low blood pressure, seen in shock but not necessarily indicative of it. (11 Jan 1998) |
| hypotension, orthostatic | Some symptoms of dizziness such as wooziness, feeling about to black out, and tunnel vision can be due to insufficient blood flow to the brain. The cause is transient low blood pressure (hypotension) due usually to suddenly standing up (orthostatic). The symptoms are typically worse when standing, improve with lying down and may be experienced by healthy individuals who rise quickly from a chair, often after a meal, and have a few seconds of disorientation. (12 Dec 1998) |
| idiopathic orthostatic hypotension | <clinical sign> The tendency for blood pressure to drop for unknown reasons on assuming upright posture. (05 Mar 2000) |
| intracranial hypotension | Subnormal pressure of the cerebrospinal fluid. It is most commonly found after lumbar puncture and is associated with headache, nausea, vomiting, stiffness of the neck, and sometimes fever. It may also result from dehydration. (12 Dec 1998) |
| ocular hypotension | Abnormally low intraocular pressure often related to chronic inflammation (uveitis). (12 Dec 1998) |
| orthostatic hypotension | <cardiology> The manifestation of low blood pressure when rising from a chair or bed. A drop in blood pressure that is precipitated by changes in body position. May be related to hydration status, drug side effect or be caused by a dysfunction in the autonomic nervous systems ability to maintain blood pressure with positional changes (for example autonomic neuropathy secondary to diabetes). (27 Sep 1997) |
| rheumatoid arthritis, systemic-onset juvenile | Also known as systemic-onset juvenile chronic arthritis. Still's disease presents with systemic (bodywide) illness including high intermittent fever, a salmon-coloured skin rash, swollen lymph glands, enlargement of the liver and spleen, and inflammation of the lungs (pleuritis) and around the heart (pericarditis). The arthritis may not be immediately apparent but it does appear and may persist after the systemic symptoms are gone. (12 Dec 1998) |
| portal-systemic anastomoses | Naturally-occurring venous communications between tributaries of the portal venous system and tributaries of the systemic venous system. The major portal-systemic anastomoses include: 1) oesophageal branches of left gastric vein with oesophageal veins, 2) superior rectal vein with middle and inferior rectal veins, 3) paraumbilical veins with subcutaneous veins of anterior abdominal wall, 4) retroperitoneal veins with venous branches of veins of the colon and bare area of the liver, and 5) a patent ductus venosus connecting left branch of portal vein to inferior vena cava (rare). These anastomoses are important clinically, providing collateral circulation during portal obstruction or hypertension, at which time they may become varicose. See: caput medusae, oesophageal varices, haemorrhoids. Surgically-created communications between the portal vein and the inferior vena cava or their tributaries, to relieve portal hypertension. Synonym: portacaval anastomoses. (05 Mar 2000) |
| portal-systemic encephalopathy | An encephalopathy associated with cirrhosis of the liver, attributed to the passage of toxic nitrogenous substances from the portal to the systemic circulation; cerebral manifestations may include coma. Synonym: hepatic encephalopathy. (05 Mar 2000) |
| scleroderma, systemic | A chronic, progressive dermatosis characterised by boardlike hardening and immobility of the affected skin, with visceral involvement, especially of lungs, oesophagus, kidneys and heart. It may be accompanied by calcinosis, raynaud's phenomenon, and telangiectasis (crest syndrome). It includes acrosclerosis and sclerodactyly. (12 Dec 1998) |
| systemic | <anatomy> Pertaining to or affecting the body as a whole. (18 Nov 1997) |
| systemic anaphylaxis | The immediate response, involving smooth muscles and capillaries throughout the body of a sensitised individual, that follows intravenous (and occasionally intracutaneous) injection of antigen (allergen). See: anaphylactic shock. Synonym: systemic anaphylaxis. (05 Mar 2000) |