[ A ]

• ATLAS  Adolescents Training and Learning to Avoid Steroids; Aspirin and Ticlid vs Anticoagulants for Stents [study]; Assessment of Treatment with Lisinopril and Survival [trial]
• ATLAST  Antiplatelet Therapy vs Lovenox Plus Antiplatelet Therapy for Patients with Increased Risk of Stent Thrombosis; Aspirin/Ticlopidine vs Low-Molecular-Weight Heparin/Aspirin/Ticlopidine Stent Trial
• ATLL  adult T-cell leukemia/lymphoma
• ATLP  anterior titanium thoracolumbar locking plate
• ATLS  acute tumor lysis syndrome; Advanced Tool for Learning Anatomical Structures; advanced trauma life support
• ATLV  adult T-cell leukemia virus
• ATM  abnormal tubular myelin; acute transverse myelopathy; adaptive template moderated; advanced trauma management; Arizona Asynchronous Transfer Mode [network]; asynchronous transfer mode; asynchronous transfer protocol; ataxia-telangiectasia-mutated [protein]; atmosphere; average time of maintenance
• atm  standard atmosphere
• ATMA  Amiodarone Trials Meta Analysis; antithyroid plasma membrane antibody
• ATMI  application transaction manager interface
• atmos  atmospheric
• ATMTN  asynchronous transfer mode teleradiology network
• ATN  acute tubular necrosis; Adolescent Trials Network; augmented transition network
• ATNC  atraumatic normocephalic
• at no  atomic number
• ATNR  asymmetric tonic neck reflex
• A-to-D  analog-to-digital
• A_TOT  total anions
• ATP  addiction treatment program; adenosine triphosphate; ambient temperature and pressure; annual transmission potential; antitachycardia pacing; Arizona Telemedicine Program; autoimmune thrombocytopenic purpura
• A-TP  adsorbed test plasma
• AT-P  antitrypsin-Pittsburgh
• AtP  attending physician
• ATPA  2-amino-3-(hydroxy-5-tert-butylisoxazol-4-yl) propanoic acid
• AT-PAS  aldehyde-thionine-periodic acid Schiff [test]
• ATPase  adenosine triphosphatase
• ATPD  dried at ambient temperature and pressure
• ATP-2Na  adenosine triphosphate disodium
• ATPS  ambient temperature and pressure, saturated
• ATR  Achilles tendon reflex; Achilles tendon rupture; acid-tolerance response; alpha-thalassemia-mental retardation [syndrome]; ataxia-telangiectasia and rad3-related [protein]; attenuated total reflectance; automatic term recognition; axial trunk rotation
• atr  atrophy
• ATR1  alpha-thalassemia mental retardation [syndrome] type 1
• ATR2  alpha-thalassemia mental retardation [syndrome] type 2
• ATRA  all-transretinoic acid
• ATRAMI  Autonomic Tone and Reflexes After Myocardial Infarction [trial]
• ATRAS  Adrenal Test Retrieval and Analysis System
• Atr fib  atrial fibrillation
• ATRX, ATR-X  X-linked alpha-thalassemia mental retardation [syndrome]
• ATS  Achard-Thiers syndrome; acid test solution; alpha-D-tocopherol acid succinate; American Thoracic Society; American Trauma Society; American Trudeau Society; antirat thymocyte serum; antitetanus serum; antithymocyte serum; anxiety tension state; arteriosclerosis; autologous transfusion system
• ATSDR  Agency for Toxic Substances and Disease Registry
• ATT  arginine tolerance test; aspirin tolerance time
• att  attending
• atten  attenuated
• ATTMH  Australian Therapeutic Trial of Mild Hypertension
• ATTRACT  application of telemedicine taking rapid advantage of cable television
• ATV  Abelson virus transformed; Ambystoma tigrinum stebbinsi virus; antisense target validation; atazanavir; avian tumor virus
• at vol  atomic volume
• at wt  atomic weight
• ATX  associated expressions [UMLS]
• ATx  adult thymectomy
• atyp  atypical
• ATZ  acetazolamide; atypical transformation zone
• Au  Australia [antigen]; authorization
• AUA  American Urological Association; asymptomatic urinary abnormalities
• Au Ag  Australia antigen
• AUB  abnormal uterine bleeding
• AUC  area under the curve
• AUC_extra  extrapolated area under the curve
• AuCPV  Aglais urticae cypovirus
• AUC_SS  steady-state area under the curve
• AUD  arthritis of unknown diagnosis
• aud  auditory
• AUDEX  automated urologic diagnostic expert [ultrasonographic imaging]
• AUDIT  alcohol use disorders identification test
• AUDIT-C  alcohol use disorders identification test-alcohol consumption questions
• aud-vis  audiovisual
• AUG  acute ulcerative gingivitis; adenosine-uracil-guanine
• AUGH  acute upper gastrointestinal hemorrhage
• AuHAA  Australia hepatitis-associated antigen
• AUI  Alcohol Use Inventory
• AUL  acute undifferentiated leukemia
• AUMC  area under the first moment curve
• AUMC_extra  extrapolated area under the first moment curve
• AUO  amyloid of unknown origin
• AuP  Australian antigen protein
• AUPHA  Association of University Programs in Health Administration
• AUR  Association of University Radiologists
• aur, auric  auricle, auricular
• AURAV  Aura virus
• AURT  Association of University Radiologic Technicians
• AUS  acute urethral syndrome; artificial urinary sphincter
• AuS  Australia serum hepatitis
• aus, ausc  auscultation
• AuSH  Australia serum hepatitis
• AUST  Australian Urokinase Stroke Trial
• AUT  authentication
• AutoCAD  auto-computer assisted diagnosis [software]
• Auto-PEEP  self-controlled positive end-expiratory pressure
• AUV  anterior urethral valve
• aux  auxiliary
• AV  adeno-associated virus; adenovirus; Adriamycin and vincristine; air velocity; allergic vasculitis; anteroventral; anteversion; anticipatory vomiting; antivirin; aortic valve; arenavirus; arteriovenous; artificial ventilation; ascovirus; asparagus virus; assisted ventilation; atrioventricular; audiovisual; augmented vector; average; aviation medicine; avoirdupois
• A-V  arteriovenous; atrioventricular
• A/V  ampere/volt; arteriovenous
• Av  average; avoirdupois
• aV  abvolt
• av  air velocity; average; avulsion
• AVA  activity vector analysis; anthrax vaccine adsorbed; antiviral antibody; aortic valve annulus; aortic valve area; aortic valve atresia; Arracacha virus A; arteriovenous anastomosis
• AvaCPV  Agraulis vanillae cypovirus
• AV/AF  anteverted, anteflexed
• AVAV  Avalon virus
• AVB  Arracacha virus B; atrioventricular block
• AVC  aberrant ventricular conduction; Academy of Veterinary Cardiology; aortic valve closure; arteriovenous communication; Association of Vitamin Chemists; associative visual cortex; atrioventricular canal; automatic volume control
• AVCN  anteroventral cochlear nucleus
• AVCO₂R  arteriovenous carbon dioxide removal
• AVCS  atrioventricular conduction system
• AVCx  atrioventricular circumflex branch
• AVD  aortic valvular disease; apparent volume of distribution; Army Veterinary Department; atrioventricular dissociation
• AvDNV  Agraulis vanillae densovirus
• AVDO₂  arteriovenous oxygen saturation difference
• AVDO₂B  arteriovenous oxygen saturation difference, basal
• AVDP  average diastolic pressure
• avdp  avoirdupois
• AVE  aortic valve echocardiogram
• ave, aver  average
• AVED  ataxia with vitamin E deficiency
• AVERT  Atorvastatin vs Revascularization Treatment [trial]
• AVEU  AIDS Vaccine Evaluation Unit
• AVF  antiviral factor; arteriovenous fistula
• aVF  automated volt foot
• aV_F  unipolar limb lead on the left leg in electrocardiography
• AVG  ambulatory visit group; aortic valve gradient
• avg  average
• AVH  acute viral hepatitis
• AVHD  acquired valvular heart disease
• AVHS  acquired valvular heart syndrome
• AVI  air velocity index; Association of Veterinary Inspectors; atrioventricular interval; audio-video interleave
• AviCPV  Arctia villica cypovirus
• AVID  Amiodarone vs Implantable Defibrillators [trial]; Angiography vs Intravascular Ultrasound Directed Coronary Stent Placement [trial]; Antiarrhythmics vs Implantable Defibrillators [study]
• AVIR  aortic valve replacement
• AVJ  atrioventricular junction
• AVJR  atrioventricular junction rhythm
• AVJRe  atrioventricular junctional reentrant
• AVL  automatic vehicle locator
• aVL  automated volt left
• aV_K  unipolar limb lead on the left arm in electrocardiography
• AVLINE  Audiovisuals Online [NLM database]
• AVLJ  absolute value of logarithm of Jacobian
• AVM  arteriovenous malformation; atrioventricular malformation; avermectin; aviation medicine
• AVMA  American Veterinary Medical Association
• AVN  acute vasomotor nephropathy; atrioventricular nodal [conduction]; atrioventricular node; avascular necrosis
• AVNA  atrioventricular node artery
• AVND  atrioventricular node dysfunction
• AVNFH  avascular necrosis of the femoral head
• AVNFRP  atrioventricular node functional refractory period
• AVNR  atrioventricular nodal reentry
• AVNRT  atrioventricular node reentry tachycardia
• AVO  aortic valve opening; aortic valve orifice; atrioventricular opening
• AVO₂  arteriovenous oxygen ratio
• AVOA  amorphous vascular occluding agent
• AVP  abnormal vasopressin; actinomycin-vincristine-Platinol; ambulatory venous pressure; antiviral protein; aortoventriculoplasty; aqueous vasopressin; arginine-vasopressin; arteriovenous passage time
• AVP-NPII  arginine vasopressin-neurophysin II
• AVPU  alert, verbal, painful, unresponsive [neurologic test]
• AVR  accelerated ventricular rhythm; antiviral regulator; aortic valve replacement
• aVR  automated volt right
• aV_R  unipolar limb lead on the right arm in electrocardiography
• AVREO  avian reovirus
• AVRI  acute viral respiratory infection
• AVRP  atrioventricular refractory period
• AVRR  antiviral repressor regulator
• AVRT  atrioventricular reciprocating tachycardia; atrioventricular reentrant tachycardia; atrioventricular reentry
• AVS  Advanced Visual Systems; aortic valve stenosis; application visualization system; arteriovenous shunt; auditory vocal sequencing
• AVSD  atrioventricular septal defect
• AVSV  aortic valve stroke volume
• AVT  Allen vision test; arginine vasotocin; Aviation Medicine Technician
• AVV  atrioventricular valve
• AvV  Agraulis vanillae virus
• Av3V  anteroventral third ventricle
• AVVM  angiographically visualized vascular malformation
• AVY  Arracacha virus Y
• AVZ  avascular zone
• AW  able to work; above waist; abrupt withdrawal; airways; alcohol withdrawal; alveolar wall; anterior wall; atomic warfare; atomic weight
• A&W  alive and well
• aw  airway; water activity
• AWAR  anterior wall of aortic root
• AWBM  alveolar wall basement membrane
• AWBV  Ahlum waterborne virus
• AWD  alive with disease
• AWESOME  Angina with Extremely Serious Operative Mortality Evaluation
• AWFM  adaptive Walsh function modeling
• AWG  American Wire Gauge
• AWGN  additive white gaussian noise [telemedicine]
• AWHILES  All-Wales Health Information and Library Extension Service
• AWI  anterior wall infarction
• AWIGS  advanced workplace for image-guided surgery
• AWL  active waiting list
• AWM  abnormal wall motion
• AWMI  anterior wall myocardial infarction
• AWMN  Acid Waters Monitoring Network [UK]
• AWMV  amplitude-weighted mean velocity
• AWO  airway obstruction
• AWOL  absent without official leave
• AWP  airway pressure; any willing provider; average of the wholesale prices; average wholesale price
• AWR  absolute weighted residual; airway restriction
• AWRS  anti-whole rabbit serum
• AWRU  active wrist rotation unit
• AWS  Alagille-Watson syndrome; alcohol withdrawal syndrome
• AWTA  aniridia-Wilms tumor association
• awu  atomic weight unit
• ax  axillary; axis, axial
• AxCPV  anti-xanthomista cypovirus
• AXD  axillary dissection
• AXF  advanced x-ray facility
• AXG  adult xanthogranuloma
• AXL  anexelekto [oncogene]; axillary lymphoscintigraphy
• AXR  abdominal x-ray [examination]
• AXT  alternating exotropia
• AYA  acute yellow atrophy
• AYF  antiyeast factor
• AYP  autolyzed yeast protein
• AYV  Anthriscus yellows virus
• AZ  Aschheim-Zondek [test]; 5-azacytidine; azathioprine
• Az  nitrogen [Fr. azote]
• AZA  azathioprine; azelaic acid
• AzC  azacytosine
• AZEV  Acrobasis zelleri entomopoxvirus
• AZF  azoospermia factor
• AzG, azg  azaguanine
• AZGP  zinc-alpha-2-glycoprotein
• AZO  [indicates presence of the group — N:N—]
• AZOA  azaorotic acid
• AZQ  diaziquone
• AZR  alizarin
• AZT  Aschheim-Zondek test; azidothymidine; 3´-azido-3´-deoxythymidine; zidovudine (azidothymidine)
• AZTEC  amplitude zone time epoch coding [in ECG]
• AZTMP  azidothymidine monophosphate
• AZT-R  azidothymidine-resistant
• AZT-S  azidothymidine-susceptible or sensitive
• AZTTP  azidothymidine trithiophosphate
• AZT-TP  3´-azido-3´-deoxythymidine triphosphate
• AZU  azauracil; azurocidin
• AzUr  6-azauridine

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