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Addison's disease
A disease due to hyposecretion of glucocorticoids, characterized by low blood pressure,
diarrhea, digestive disturbance, and a bronzelike pigmentation of the skin
Adjunctive agents
Agents that supplement the primary anesthetic agents to augment or enhance the
effects of the primary agent
Allergenicity
Having the property of an allergen, a substance that will elicit an allergic response in
sensitive individuals
Alveolus (plural: alveoli)
A small air sac within the body of the lung
Amide
A chemical structure derived from ammonia; there is a group of amide local anesthetics
that are widely used in dentistry (eg, lidocaine, mepivacaine, prilocaine, bupivacaine).
Amnesia
Failure to remember events related to surgery
Analgesia
Insensitivity to pain
Anaphylaxis
A severe allergic reaction marked by any of several severe responses, including skin
reactions, smooth muscle cramping, urinary incontinence, construction of bronchioles,
respiratory difficulty, and cardiovascular collapse
Anemia
A reduction in the number of red blood cells in the bloodstream
Angina pectoris
Pain in the chest, with a feeling of suffocation, usually due to deficiency of blood supply
to the myocardium
Antecubital
Situated in front of the elbow
Antecubital fossa
The depression between the forearm and the upper arm that is literally "in front of the
elbow"
Anticholinergic
A drug that counteracts the action of acetylcholine, the neurotransmitter of the
parasympathetic nervous system and thereby blocks the action of the parasympathetic
nerves
Antiemetic
A drug that counteracts nausea and vomiting
Antisialagogue
A drug that counteracts the production of saliva
Anxiolytic
Drugs that reduce anxiety, agitation, or tension (eg, Valium, midazolam)
, Aorta
The main trunk (a very large artery) from which the arterial system proceeds
Apnea
Absence or cessation of breathing
Arrest rhythms
Cardiac rhythms in which there is cardiac arrest. Some arrest rhythms such as
pulseless ventricular tachycardia are accompanied by a rhythm display, but there is no
contraction
Arrhythmia
Any variation from the normal rhythm of the heartbeat
Arteriole
Any of the very small arterial branches located at the end of an artery (furthest from the
heart)
Artery
A vessel that varies blood away from the heart to other parts of the body
Ascites
Accumulation of the serous fluid in the abdominal cavity
Asystole
Cardiac arrest in which there is no rhythm display and no contraction
Ataractics
Pharmacologic agents that produce a tranquilizing effect
Atherosclerosis
A disease of the arteries characterized by the deposition of plaques of fatty material on
their inner walls
Atrial fibrillation
Atrial arrhythmia characterized by rapid randomized contractions of the atrial
myocardium, causing a totally irregular and often rapid ventricular rate
Atrial flutter
A condition of cardiac arrhythmia in which the atrial contractions are rapid (200 to 320
per minute)
Atrial (supraventricular) rhythms
Dysrythmias in which the pacemaker is in the atria above the level of the ventricles
(supraventricular) area
Atrial Tachycardia
Rapid heartbeat originating from the atria
Atrioventricular block (AV block)
A cardiac conduction defect in which the impulse generated by the SA node is partially
or completely blocked in the area of the AV nose
Atrioventricular node
A microscopic collection of heart muscle fibers involved in the electrical activity of the
heart
Atrium (plural: atria)
An upper chamber of the heart; atria also exist in other parts of the body
Automaticity
The condition of being automatic
Autonomic nervous system