| haematopoietin | <growth factor, hormone> Erythropoietin is a Glycoprotein (46 kD) hormone produced by specialised cells in the kidneys that regulates the production of red blood cells in the marrow. These cells are sensitive to low arterial oxygen concentration and will release erythropoietin when oxygen is low. Erythropoietin stimulates the bone marrow to produce more red blood cells (to increase the oxygen caring capacity of the blood). The measurement of this hormone in the bloodstream can indicate bone marrow disorders or kidney disease. Normal levels of erythropoietin are 0 to 19 mU/ml (milliunits per millilitre). Elevated levels can be seen in polycythaemia rubra vera. Lower than normal values are seen in chronic renal failure.Recombinant erythopoeitin is now being used therapeutically in patients. Acronym: EPO (27 Sep 1997) |
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| haematoporphyria | An obsolete term for any disorder of porphyrin metabolism, regardless of the cause. Origin: haemato-+ G. Porphyra, purple (05 Mar 2000) |
| haematoporphyrin | <protein> A type of artificial porphyrin which forms when sulphuric acid is added to haemoglobin in vitro. It has the chemical formula of C34H38N4O6 and is not found naturally. (09 Oct 1997) |
| haematoporphyrin derivative | <chemical> A complex mixture of monomeric and aggregated porphyrins used in the photodynamic therapy of tumours (haematoporphyrin photoradiation). A purified component of this mixture is known as dihematoporphyrin ether. Pharmacological action: antineoplastic agent, photosensitizing agents. Chemical name: Haematoporphyrin D (12 Dec 1998) |
| haematoporphyrin photoradiation | Photochemotherapy using visible light, usually red, topically or delivered locally by fibreoptic probe to tissues sensitised with haematoporphyrins. (12 Dec 1998) |
| haematoporphyrinaemia | Older term used to designate the occurrence of haematoporphyrin in the circulating blood. (05 Mar 2000) |
| haematoporphyrins | Iron-free derivatives of haem with 4 methyl groups, 2 hydroxyethyl groups and 2 propionic acid groups attached to the pyrrole rings. (12 Dec 1998) |
| haematoporphyrinuria | Older term used to designate enhanced urinary excretion of porphyrins. (05 Mar 2000) |
| haematopsia | Synonym: haemophthalmia. Origin: haemato-+ G. Opsis, vision (05 Mar 2000) |
| haematorrhachis | A spinal haemorrhage. Synonym: haemorrhachis. Origin: haemato-+ G. Rhachis, spine Haematorrhachis externa, haemorrhage into the spinal canal external to the cord, either within or outside the dura. Synonym: extradural haematorrhachis, subdural haematorrhachis. (05 Mar 2000) |
| haematorrhachis interna | A haemorrhage (area of internal bleeding) which extends into the spinal cord, occurs usually as a result of injury. (09 Oct 1997) |
| haematosac | <anatomy> A vascular sac connected, beneath the brain, in many fishes, with the infundibulum. Origin: Haemato- + sac. Source: Websters Dictionary (01 Mar 1998) |
| haematosalpinx | Collection of blood in a tube, often associated with a tubal pregnancy. Synonym: haemosalpinx. Origin: haemato-+ G. Salpinx, a trumpet (05 Mar 2000) |
| haematoscope | <instrument> A haemoscope. Source: Websters Dictionary (01 Mar 1998) |
| haematosepsis | Systemic disease associated with the presence and persistence of pathogenic microorganisms or their toxins in the blood. Synonym: blood poisoning. See: bacteraemia. Origin: Gr. Haima = blood (11 Jan 1998) |