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 ?
Our study concludes that in our setup the incidence of Intraventricular dyssynchrony was high among patients presenting with left bundle branch block. LV dyssynchrony is not the only mechanism responsible for less efficient LV pump but there are other mechanisms in play as well.
Complete left or right bundle branch block at presentation has been reported to occur in 1% to 15% of patients with acute myocardial infarction and it has been associated with increased risk for short- and long-term death.
Cardiac magnetic resonance evaluation of the impact of interventricular and intraventricular dyssynchrony on cardiac ventricular systolic and diastolic function in patients with isolated left bundle branch block. Am J Cardiol.
Hindman MC, Wagner GS, JaRo M, Atkins JM, Scheinman MM, DeSanctis RW, Hutter AH Jr, Yeatman L, Rubenfire M, Pujura C, Rubin M, Morris JJ (1978) The clinical significance of bundle branch block complicating acute myocardial infarction.
But left bundle branch block (LBBB) is common, especially as people get older.
Wagner, "Defining left bundle branch block in the era of cardiac resynchronization therapy," The American Journal of Cardiology, vol.
Abnormalities, noted in patients ECGs' were as follows: ST depression (Minnesota code 4.1.2: STJ depression [greater than or equal to] 1 mm but < 2 mm and ST segment horizontal or downward sloping in any of leads V1, V2, V3, V4, V5), T-wave changes (Minnesota code 5.2: T amplitude negative or diphasic with negative phase at least 1 mm but not as deep as 5 mm in lead I or V6, or in lead aVL when R amplitude is [greater than or equal to] 5 mm), early QRS transition zone (Minnesota code 9.4.1: QRS transition zone at V3 or to the right of V3 on the chest), complete right bundle branch block (RBBB) (Minnesota code 7.2.1), complete left bundle branch block (LBBB) (Minnesota code 7.1.1).
Because left bundle branch block and non-ischemic heart disease lead to diffuse, as opposed to localized, heart problems, study authors reasoned women were more responsive to CRT-D therapy, a treatment that strengthens the overall mechanical pumping action of the heart and coordinates the heart's electrical activity.
Also, a post-hoc subgroup analysis of the primary end point suggests that patients with an intrinsic QRS duration of more than 150 milliseconds derive more benefit from CRT-ICD therapy, as do those with left bundle branch block, although the latter fending was weaker, Dr.
The new use is for patients with an abnormality known as left bundle branch block, which occurs when there is delayed activation and contraction of the left ventricle.
Panel members said the approval should be limited to patients in those categories who also have an electrical problem in the heart known as a left bundle branch block. Boston Scientific said about 70% of the patients it studied had that problem.
A nurse took his ECG which revealed a massive heart attack with left bundle branch block.