block

(redirected from atrioventricular block)
Also found in: Dictionary, Thesaurus, Medical, Legal, Financial, Acronyms, Wikipedia.
Related to atrioventricular block: Bundle branch block

block

2. a casing housing one or more freely rotating pulleys
3. Pathol
a. interference in the normal physiological functioning of an organ or part
b. See heart block
c. See nerve block
4. Psychol a short interruption of perceptual or thought processes
5. Computing a group of words treated as a unit of data on a tape, disk, etc
6. Athletics short for starting block
7. Cricket a mark made near the popping crease by a batsman to indicate his position in relation to the wicket

Block

A large piece of stone, taken from the quarry to the mill for sawing and further working.

Block

 

in engineering:

(1) A unit of a mechanism in the form of a wheel with a groove around its circumference over which a cable or chain is drawn. It is used to change the direction of a tractive force and to obtain a force or velocity advantage; more rarely, to transfer a torque. Depending on their function, blocks are known as guide, balance, runner, and driving (for imparting rotary motion to a shaft) pulleys. In order to achieve a large force or velocity advantage, a lifting mechanism made up of a combination of blocks (a block and tackle) is used.

(2) A subassembly of a machine, consisting of several identical parts, such as a block of cylinders in an internal combustion engine or the spindle block in a multiple-spindle machine.

(3) A stone (concrete or ceramic) of large size (appreciably larger than a brick) used in the construction of buildings and for road surfacing.

N. IA. NIBERG

block

[bläk]
(computer science)
A group of information units (such as records, words, characters, or digits) that are transported or considered as a single unit by virtue of their being stored in successive storage locations; for example, a group of logical records constituting a physical record.
The section of a computer memory or storage device that stores such a group of information units. Also known as storage block.
To combine two or more information units into a single unit.
A contiguous group of text characters that is marked for moving, copying, saving, deletion, or some other word-processing operation.
(design engineering)
A metal or wood case enclosing one or more pulleys; has a hook with which it can be attached to an object.
(mining engineering)
A division of a mine, usually bounded by workings but sometimes by survey lines or other arbitrary limits.
In quarrying, a large portion of rock that is removed from the quarry as a solid mass for further processing at a mill.
(petroleum engineering)
The subdivision of a sea area for the licensing of oil and gas exploration and production rights.
(statistics)
In experimental design, a homogeneous aggregation of items under observation, such as a group of contiguous plots of land or all animals in a litter.

block

block, 6
1. A masonry unit; a concrete block.
2. (Brit.) A walling unit which exceeds in length, width, or height the dimensions specified for a brick.
3. A solid piece of wood or other material.
4. A plank or timber which serves as bridging between joists or the like.
5. In quarrying, the large piece of stone, generally squared, that is taken from the quarry to the mill for sawing, slabbing, and further working.
6. A mechanical

block

1. <unit> A unit of data or memory, often, but not exclusively, on a magnetic disk or magnetic tape.

Compare record, sector.

block

(1) A group of disk or tape records that is stored and transferred as a single unit. On a CD, a block consists of 98 frames of 33 bytes for a total of 3,234 bytes, or 1/75th of a second. See block level.

(2) A group of bits or bytes that is transmitted or processed as a single unit.

(3) A group of text characters that has been marked for moving, copying, saving or other operation.

(4) A rectangular group of pixels that are processed as a unit.

(5) A group of program statements that are treated as a unit based on the results of a comparison.
References in periodicals archive ?
Oral doxycycline, amoxicillin, or cefuroxime are recommended for adults with early Lyme disease without specific neurologic syndromes or high-grade atrioventricular block.
Complete atrioventricular block is virtually never persistent in patients with inferior myocardial infarction or digitalis toxicity, and consequently these patients do not require permanent electronic pacing.
Another case report explained syncope in PE due to bradycardia and atrioventricular block which results from parasympathetic reflex.
Atrioventricular block is the most common sideeffect of these agents in the postoperative period (36,37).
When she experienced atrioventricular block and felt lightheaded after being given a sandwich by the Birmingham physicians, they diagnosed swallow syncope and fitted her with a pacemaker.
A follow-on analysis of all of the novel SNPs in Icelandic and Norwegian heart patients and controls demonstrated the association of two of the SNPs linked to PR interval to risk of AF, and another SNP to increased risk of advanced atrioventricular block.
Isolated fetal atrioventricular block was reviewed in a retrospective European study of 175 cases (12).
Complete atrioventricular block and ventricular tachyarrhythmia associated with donepezil.
Arsenic trioxide can cause QT prolongation (which can lead to torsade de pointes) and complete atrioventricular block.
Other electrocardiographic manifestations of hypothermia include sinus bradycardia, atrial and ventricular arrhythmias, prolonged intervals (PR, QRS, QT), different degrees of atrioventricular block, and findings related to electrolyte abnormalities (ie, hyperkalemia).
First-degree atrioventricular block can be detected in healthy pilots and it is related to the increased resting vagal tone.

Full browser ?