| variant angina | A sudden vasoconstriction of a coronary artery depriving the myocardium of blood flow and oxygen. This may clinically manifest as chest pain referred to as variant angina or Printzmetal's angina. May be precipitated by emotional stress, medications, street drugs (cocaine) or on exposure to cold. Treatment includes nitroglycerin or beta-blocker medications. (27 Sep 1997) |
|---|---|
| variant angina pectoris | A form of angina pectoris, characterised by pain that is not precipitated by cardiac work, is of longer duration, is usually more severe, and is associated with unusual electrocardiographic manifestations including elevated ST segments in leads that are ordinarily depressed in typical angina, and usually without reciprocal ST changes; occurring at night in bed. Synonym: angina inversa, variant angina pectoris. (05 Mar 2000) |
| variant haemoglobin | A harmless mutant form of Hb. (05 Mar 2000) |
| variant surface glycoproteins, trypanosoma | Glycoproteins attached to the surface coat of the trypanosome. Many of these glycoproteins show amino acid sequence diversity expressed as antigenic variations. This continuous development of antigenically distinct variants in the course of infection ensures that some trypanosomes always survive the development of immune response to propagate the infection. (12 Dec 1998) |
| variate | A measurable quantity capable of taking on a number of values; may be binary (i.e., capable of taking on two values in a certain interval of values), continuous (i.e., capable of taking on all values in a certain interval of real values), or discrete (i.e., capable of taking on a limited number of values in a certain interval of real values). (05 Mar 2000) |
| variation | In genetics, deviation in characters in an individual from those typical of the group to which it belongs, also, deviation in characters of the offspring from those of its parents. (18 Nov 1997) |
| variation (genetics) | The phenotypic differences among individuals in a population. (12 Dec 1998) |
| varication | Formation or presence of varices. (05 Mar 2000) |
| variceal | Of or pertaining to a varix. (05 Mar 2000) |
| varicella | Chicken pox. (18 Nov 1997) |
| varicella encephalitis | Encephalitis occurring as a complication of chickenpox. (05 Mar 2000) |
| varicella gangrenosa | Gangrenous ulceration of varicella lesions with or without secondary infection, occurring mainly in children with severe underlying disease. (05 Mar 2000) |
| varicella vaccination | See Vaccination, chickenpox. (12 Dec 1998) |
| Varicella zoster | <virology> Member of the Alphaherpesvirinae, human herpes simplex virus type 3, causative agent of chickenpox and shingles. (18 Nov 1997) |
| varicella zoster virus | <virology> The cause of chicken pox in children. Its reactivation in adults causes shingles (see). (09 Oct 1997) |