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    A sudden obstruction or interruption in spontaneous flow of thinking or speaking, perceived as an absence or deprivation of thought.


A blockage in the GI tract that prevents the flow of liquids or solids.


Blocadren is a prescription or over-the-counter drug which is (or once was) legal in the United States and possibly in other countries. Active ingredient(s): timolol maleate.

Block artifacts
Visual artifacts created when an image compressed with an algorithm using block coding is reconstructed.

Block coding
Any image processing technique which begins by subdividing the image into blocks.

Block injection
Anesthesia of a nerve trunk that covers a large area of the jaw; a mandibular block injection produce numbness of the lower jaw, teeth, half the tongue

Blocker, beta adrenergic
"A class of drugs, also more simply called beta blockers, that block beta-adrenergic substances such as adrenaline (epinephrine), a key agent in the ""sympathetic"" portion of the autonomic (involuntary) nervous system."

Blockers, beta
"A class of drugs that block beta-adrenergic substances such as adrenaline (epinephrine), a key agent in the ""sympathetic"" portion of the autonomic (involuntary) nervous system."

Blocking antibody
A functional term for an antibody molecule capable of blocking the interaction of antigen with other antibodies or with cells.


Bovine malignant catarrhal fever
Malignant catarrhal fever is an acute, highly fatal, viral, infectious disease of cattle and sheep , characterized by an erosive stomatitis, gastroenteritis and erosions of the mucosa of the upper respiratory tract.

Dilatation of bronchi. The noun form is ectasia.

Zoophilia; sexual relations between a human being and an animal. See also paraphilia.

An agent that inhibits the action of beta-adrenergic receptors, which modulate cardiac functions, respiratory functions, and the dilation of blood vessels. Beta-blockers are of value in the treatment of hypertension, cardiac arrhythmias, and migraine. In psychiatry, they have been used in the treatment of aggression and violence, anxiety-related tremors and lithium-induced tremors, neuroleptic-induced akathisia, social phobias, panic states, and alcohol withdrawal.

Bizarre delusion
A delusion that involves a phenomenon that the person's culture would regard as totally implausible.


Blunted affect
An affect type that represents significant reduction in the intensity of emotional expression.

Body image
One's sense of the self and one's body.

Broca's aphasia
Loss of the ability to comprehend language coupled with production of inappropriate language.


Basic Life Support
This is the most basic of the health care provider skills for resuscitation of cardiac arrest patients. It includes only non-invasive techniques, including CPR with basic adjuncts; most states are adding difibrilation to the skill set of the BLS personnel. This is practiced by EMT's, first responders and is the first step of resuscitation in any arrest. Often called BLS or BCLS.

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