| A-V block | <cardiology> A conduction disturbance that results in the inappropriate delay (or complete inability) of a electrical impulse, generated in the atria, to reach the ventricles (via the atrioventricular node). Clinical types are divided into first (nonserious), second and third degree (most serious). Some drugs may precipitate atrioventricular block (for example clonidine, methyldopa, verapamil). A permanent pacemaker may be required for a third degree (complete) heart block. (02 Jan 1998) |
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| block | An obstruction or stoppage. (18 Nov 1997) |
| block anaesthesia | Regional anaesthesia in which local anaesthetic solution is injected about nerves to inhibit nerve transmission; includes spinal, epidural, nerve block, and field block anaesthesia, but not local or topical anaesthesia. Synonym: block anaesthesia. (05 Mar 2000) |
| block book | A book printed from engraved wooden blocks instead of movable types. Source: Websters Dictionary (01 Mar 1998) |
| block design test | A performance test using coloured blocks which the individual must use to match pictured designs; one of the subtests of the Wechsler intelligence scales. (05 Mar 2000) |
| block-out | Elimination of undercuts by filling such areas with a medium such as wax or wet pumice. (05 Mar 2000) |
| block vertebra | <radiology> Congenital vertebral fusion, location: lumbar or cervical, height of the fused vertebral bodies equals the sum of heights of the involved bodies and intervertebral disc, waist at level of disc space see: cervical spine fusion (12 Dec 1998) |
| block vertebrae | Congenitally fused and hypoplastic vertebral bodies which, on radiographs, give the appearance of a more or less solid bony mass. See: Klippel-Feil syndrome. (05 Mar 2000) |
| bone block | A surgical procedure in which the bone adjacent to the joint is modified to limit the motion of the joint mechanically; e.g., at the ankle joint to correct foot-drop by preventing extension below 90 |
| calcium-calmodulin-dependent phosphodiesterase | <enzyme> Hydrolyzes both cgmp and camp; induced during mitogenesis Registry number: EC 3.1.4.- Synonym: ca-cam-phosphodiesterase, calmodulin-dependent cgmp phosphodiesterase (26 Jun 1999) |
| calcium-calmodulin dependent protein kinase | <enzyme> A calmodulin-dependent enzyme that catalyses the phosphorylation of proteins. This enzyme is also sometimes dependent on calcium. A wide range of proteins can act as acceptor, including vimentin, synapsin, glycogen synthase, myosin light chains, and the microtubule-associated proteins. Registry number: EC 2.7.10.- (12 Dec 1998) |
| calcium-dependent protein kinase | <enzyme> Mw 51,000; requires ca; not stimulated by calmodulin, phospholipids or diacylglycerol; phosphorylates casein and histones forming primarily phosphoserine and phosphothreonine, respectively Registry number: EC 2.7.1.- Synonym: paramecium ca-dependent protein kinase (26 Jun 1999) |
| calcium dependent regulator protein | <protein> (CDRP) Early name for calmodulin. (18 Nov 1997) |
| calcium dependent sulfhydryl protease | <enzyme> Hydrolyzes actin binding protein; enzyme from platelets Registry number: EC 3.4.22.- Synonym: cdsp (26 Jun 1999) |
| calcium magnesium dependent endodeoxyribonuclease | <enzyme> Similar in action but different from dnase i Registry number: EC 3.1.21.- Synonym: ca mg dnase, ca(2+)+mg(2+) dnase, calcium-magnesium endonuclease, ca-mg endonuclease (26 Jun 1999) |