| BL | Barre-Lieou [syndrome]; basal lamina; baseline; Bessey-Lowry [unit]; black light; bladder; bleeding;... |
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| BLAT | Blind Learning Aptitute Test |
| BLS | bare lymphocyte syndrome; basic life support; blind loop syndrome; blood and lymphatic system; blood... |
| BSA | benzenesulfonic acid; Biofeedback Society of America; bismuth-sulfite agar; bis-trimethylsilyl-aceta... |
| BVA | Blind Veterans Association; British Veterinary Association |
| vestibular blind sac | <anatomy> The lower extremity of the cochlear duct, occupying the cochlear recess in the vestibule. Synonym: caecum vestibulare, vestibular blind sac. (05 Mar 2000) |
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| cupular blind sac | The upper blind extremity of the cochlear duct. Synonym: caecum cupulare, cupular blind sac, lagena. (05 Mar 2000) |
| prospective, randomised, double-blind clinical trial | <statistics> A clinical trial in which the method for analysing data has been specified in the protocol before the study has begun (prospective), the patients have been randomly assigned to receive either the study drug or alternative treatment, and in which neither the patient nor the physician conducting the study know which treatment is being given to the patient. (13 Nov 1997) |
| single-blind method | A method in which either the observer(s) or the subject(s) is kept ignorant of the group to which the subjects are assigned. (12 Dec 1998) |
| double-blind | <statistics> A kind of clinical study in which neither the participants nor the person administering treatment know which treatment any particular subject is receiving. Usually the comparison is between an experimental drug and a placebo or standard comparison treatment. This method is believed to achieve the most accuracy because neither the doctor nor the patient can affect the observed results with their psychological bias. (10 Oct 1997) |
| double-blind experiment | <statistics> An experiment conducted with neither experimenter nor subjects knowing which experiment is the control; prevents bias in recording results. See: double-masked experiment. (05 Mar 2000) |
| double-blind method | <statistics> A method of studying a drug or procedure in which both the subjects and investigators are kept unaware of who is actually getting which specific treatment. (12 Dec 1998) |
| double-blind study | A study in which neither the experimenter nor any other assessor of the results, including patients, know which group is subject to which procedure, thus helping assure that the biases or expectations of either will not influence the results. (05 Mar 2000) |
| abdominal fistula | A tract leading from one of the abdominal viscera to the external surface. (05 Mar 2000) |
| amphibolic fistula | A complete anal fistula opening both externally and internally. (05 Mar 2000) |
| anal fistula | A fistula opening at or near the anus; usually, but not always, opening into the rectum above the internal sphincter. (05 Mar 2000) |
| anorectal fistula | <surgery> An abnormal tube-like passage connecting the anal canal and the rectum. May result from injuries, abscesses or inflammatory processes (for example cancer, Crohn's disease). (27 Sep 1997) |
| arterio-arterial fistula | Abnormal communication between two arteries. It may result from injury or occur as a congenital abnormality. (12 Dec 1998) |
| arteriovenous fistula | <surgery> The surgical joining of an artery and a vein under the skin for the purpose of haemodialysis. Larger arteriovenous shunts can place strain on the heart since arterial blood is diverted back to the venous circulation before it has a chance to deliver nutrients and oxygen to the body tissues. (27 Sep 1997) |
| A-V fistula | <surgery> The surgical joining of an artery and a vein under the skin for the purpose of haemodialysis. Larger arteriovenous shunts can place strain on the heart since arterial blood is diverted back to the venous circulation before it has a chance to deliver nutrients and oxygen to the body tissues. (27 Sep 1997) |