block

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Related to Bundle branch block: Left bundle branch block, Right 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 ?
Kumar V, Venkataraman R, Aljaroudi W, Osorio J, Heo J, Iskandrian AE, Hage FG (2013) Implications of left bundle branch block in patient treatment.
However, presence of T-wave negativity and bundle branch block were associated with mortality.
Bundle branch block may be something that is present at birth or can be due to heart disease, including ischaemic heart disease, inflammation of the membrane around the heart (myocarditis), cardiomyopathy or disease of the heart valves.
Electrocardiographic diagnosis of evolving acute myocardial infarction in the presence of left bundle branch block.
Incomplete right bundle branch block is a common normal variant found on electrocardiogram and is also another finding that is often associated with an athletic heart and is of no consequence.
Bundle branch block conduction or ectopic beats that do not use the normal pathways may increase the duration of a waveform.
Medtronic pacemakers are currently indicated for use in patients who have experienced one or more of the following conditions: symptomatic paroxysmal or permanent second- or third-degree AV block, symptomatic bilateral bundle branch block, symptomatic paroxysmal or transient sinus node dysfunctions with or without associated AV conduction disorders and bradycardia-tachycardia syndrome.
sup][10] According to the degree of severity and symptoms, arrhythmia was divided into minor groups such as junctional tachycardia and bundle branch block without symptoms, obviating the need for further treatment.
Objective: To determine the role of visual quantification of Tc-99m MIBI myocardial perfusion SPECT in left bundle branch block as compared to coronary angiography findings.
This is the basis of Ashman's phenomenon which is manifested in the 4th QRS from the end of the tracing where a QRS with right bundle branch block follows a short R-R interval that follows a long R-R interval.
An SVT usually has a QRS duration of <120 ms, unless there is bundle branch block (BBB) or an intraventricular conduction abnormality.
The mortality rate associated with uncomplicated infarctions is less than 20%, but the mortality rate when some form of bundle branch block is present may be as high as 60%.