block

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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 ?
Time point: post-cardiopulmonary resuscitation with endotracheal tube, stomach tube and temporary pacemaker wire in place for third degree atrioventricular block.
Long-term chloroquine treatment can produce cardiac toxicity, restrictive and hypertrophic cardiomyopathy as well as atrioventricular blocks (AVB) or other conduction disorders (3).
Autosomal dominant dilated cardiomyopathy with atrioventricular block: a lamin A/C defect-related disease.
These findings, although preliminary, are in accord with the observations of others [18] and serve to support the central tenet that it is no longer acceptable to withhold physiological pacing from patients with advanced atrioventricular block on the grounds of age alone [13].
High degree Atrioventricular block in patients with acute inferior Myocardial Infarction with and without Right Ventricular involvement.
Sixty-three (28.1%) patients had a right bundle branch block, 17 (7.6%) patients had first-degree atrioventricular block, 29 (12.9%) patients had WPW syndrome, 16 (7.1%) patients had atrial fibrillation, and 8 (3.6%) patients had paroxysmal supraventricular tachycardia (PSVT).
His arrhythmias improved and he remained stable at first-degree atrioventricular block with a normal heart rate.
The typical cardiac presentations are various degrees of atrioventricular block [8, 9].
Electrocardiographic abnormalities have been noted in 38-91% of cases and include bundle branch block (right, left) in 25%, atrioventricular block in 8%, atrial fibrillation in 2-6%, extrasystole (atrial and ventricular) in 18% and ventricular fibrillation in 2%.4 In the above series, case 3 died of ventricular fibrillation and case 5 had extensive conduction block.
If severe bradycardia or atrioventricular block appears, a pacemaker needs to be installed.
Fortunately, the tachyarrhythmia ceased spontaneously after one hour, followed by sinus bradycardia 44-49/min with first degree atrioventricular block (PR interval = 0.24 sec).

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