| combination beat | A beat triggered by more than a single electrical impulse, when the wave fronts coincide to act together on a single final pathway of activity; in the electrocardiogram, the atrial or ventricular complex when either atria or ventricles are activated jointly by two simultaneous or nearly simultaneous invading impulses. Synonym: combination beat, mixed beat, summation beat. (05 Mar 2000) |
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| combination chemotherapy | <oncology> Treatment consisting of the use of two or more chemicals to achieve maximum kill of tumour cells. (09 Jan 1998) |
| combination oral contraceptive | A mixture of a steroid having progestational activity and an oestrogen. (05 Mar 2000) |
| combination restoration | A tooth restoration of two or more materials applied in layers. (05 Mar 2000) |
| combination studies | <pharmacology> Studies in which a new drug is evaluated in combination with existing drugs. (09 Jan 1998) |
| combinatorial | Any system using a random assortment of components at any positions in the linear arrangement of atoms, i.e., a combinatorial library of mutations could contain positions where all four bases have been randomly inserted. (05 Mar 2000) |
| combined cycle | Two or more generation processes in series or in parallel, configured to optimise the energy output of the system. (05 Dec 1998) |
| combined fat-and carbohydrate-induced hyperlipaemia | Hyperlipoproteinaemia characterised by increased plasma levels of chylomicrons, VLDL, pre-beta-lipoproteins, and triglycerides, and slight rise of cholesterol on a normal diet, with beta-lipoproteins normal; may be accompanied by bouts of abdominal pain, hepatosplenomegaly, susceptibility to atherosclerosis, and abnormal glucose tolerance; probably autosomal recessive inheritance. Synonym: combined fat-and carbohydrate-induced hyperlipaemia, familial hyperchylomicronaemia with hyperprebetalipoproteinaemia, mixed hyperlipaemia. (05 Mar 2000) |
| combined glaucoma | Glaucoma with angle-closure and open-angle mechanisms in the same eye. (05 Mar 2000) |
| combined heat and power | An older term for what is now generally called cogeneration. The term is currently used in Europe and other foreign countries. (05 Dec 1998) |
| combined immunodeficiency | <immunology> Congenital immunodeficiency with thymic agenesis, lymphocyte depletion and hypogammaglobulinaemia: both cellular and humoral immune systems are affected and life expectancy is low unless marrow transplantation is successful. (18 Nov 1997) |
| combined immunodeficiency syndrome | <syndrome> A serious primary immunodeficiency affecting both T and B-cells. (05 Mar 2000) |
| combined modality therapy | <oncology> Two or more types of treatments used to supplement each other. For instance, surgery, radiation, chemotherapy, hormonal or immunotherapy may be used alternatively or together for maximum effectiveness. (09 Oct 1997) |
| combined pregnancy | Coexisting uterine and ectopic pregnancy. (05 Mar 2000) |
| combined sclerosis | A subacute or chronic disorder of the spinal cord, such as that occurring in certain patients with vitamin B12 deficiency, characterised by a slight to moderate degree of gliosis in association with spongiform degeneration of the posterior and lateral columns. Synonym: combined sclerosis, combined system disease, funicular myelitis, Putnam-Dana syndrome, vitamin B12 neuropathy. (05 Mar 2000) |