1. loss of sensation, usually by damage to a nerve or receptor; called also numbness. 2. loss of the ability to feel pain, caused by administration of a drug or by other medical interventions; cf. anesthetic (def. 2).
acupuncture anesthesia, regional anesthesia using the principles of acupuncture.
ambulatory anesthesia, anesthesia performed on an outpatient basis for ambulatory surgery.
angiospastic anesthesia, loss of sensibility dependent on spasm of the blood vessels.
balanced anesthesia, anesthesia that uses a combination of drugs, each in an amount sufficient to produce its major or desired effect to the optimum degree and keep its undesirable or unnecessary effects to a minimum.
basal anesthesia, anesthesia that acts as a basis for further and deeper anesthesia; a state of narcosis produced by preliminary medication so profound that the added inhalation anesthetic necessary to produce surgical anesthesia is greatly reduced.
Bier local anesthesia, Bier block.
block anesthesia, regional a.
brachial plexus anesthesia, see under block.
bulbar anesthesia, lack of sensation caused by a lesion of the pons.
caudal anesthesia, see under block.
closed circuit anesthesia, inhalation anesthesia maintained by the continuous rebreathing of a relatively small amount of anesthetic gas and a basal amount of oxygen, normally used with an absorption apparatus for the removal of carbon dioxide.
compression anesthesia, loss of sensation resulting from pressure on a nerve.
conduction anesthesia, regional a.
continuous epidural anesthesia, see under analgesia.
crossed anesthesia, hemianesthesia cruciata.
dissociated anesthesia, dissociation anesthesia, loss of sensitivity to pain, heat, and cold without loss of other tactile senses; seen in syringomyelia.
anesthesia doloro´sa, analgesia algera.
electric anesthesia, anesthesia induced by passage of an electric current.
endotracheal anesthesia, anesthesia produced by introduction of a gaseous mixture through a wide-bore tube inserted into the trachea through either the mouth or the nose.
epidural anesthesia, see under anesthesia.
facial anesthesia, loss of sensation caused by a lesion of the facial nerve.
frost anesthesia, former name for cryoanesthesia.
gauntlet anesthesia, loss of sensation in the hand and wrist; called also glove a.
general anesthesia, a reversible state of unconsciousness, produced by anesthetic agents, with absence of pain sensation over the entire body and a greater or lesser degree of muscular relaxation; the drugs producing this state can be administered by inhalation, intravenously, intramuscularly, or rectally.
girdle anesthesia, loss of sensation in a zone encircling the hips.
glove anesthesia, gauntlet a.
gustatory anesthesia, ageusia.
high pressure anesthesia, anesthesia produced by controlled application of pressure to a nerve trunk or its branches.
hypnosis anesthesia, production of insensibility to pain during surgical procedures by means of hypnotism.
hypotensive anesthesia, anesthesia accompanied by deliberate lowering of blood pressure to reduce blood loss and improve usability of the surgical field.
hypothermic anesthesia, anesthesia accompanied by the deliberate lowering of the body temperature. See also cryoanesthesia.
hysterical anesthesia, loss of tactile sensation occurring as a symptom of conversion disorder, often recognizable by its lack of correspondence with nerve distributions.
infiltration anesthesia, the production of local anesthesia by deposition of anesthetic solution into a superficial area.
inhalation anesthesia, anesthesia produced by the inhalation of vapors of a volatile liquid or gaseous anesthetic agent.
insufflation anesthesia, anesthesia produced by blowing a mixture of gases or vapors through a tube introduced into the respiratory tract.
intercostal anesthesia, see under block.
intrapulpal anesthesia, a local anesthetic effect produced by the administration of an anesthetic agent directly into the dental pulp.
intraspinal anesthesia, spinal a. (def. 1).
intravenous anesthesia, anesthesia produced by introduction of an anesthetic agent into a vein, usually in a limb to which a pneumatic tourniquet has been applied.Bier block.
intravenous regional anesthesia, Bier block.
local anesthesia, anesthesia confined to one area of the body; see also regional a.
lumbar epidural anesthesia, anesthesia produced by injection of the anesthetic agent into the epidural space at the second or third lumbar interspace.
muscular anesthesia, loss or lack of muscle sense.
nausea anesthesia, loss of the sensation of nausea that is normally stimulated by noxious and disgusting substances.
olfactory anesthesia, anosmia.
open anesthesia, general inhalation anesthesia utilizing a cone or ether mask; there is no significant rebreathing of expired gases.
paraneural anesthesia, perineural block.
paravertebral anesthesia, see under block.
peridural anesthesia, epidural a.
perineural anesthesia, see under block.
peripheral anesthesia, loss of sensation which is due to changes in the peripheral nerves.
plexus anesthesia, anesthesia produced by the injection of a local anesthetic around a nerve plexus.
pressure anesthesia, anesthesia caused by pressure on a nerve.
rectal anesthesia, anesthesia induced by introduction of an anesthetic agent into the rectum.
refrigeration anesthesia, former name for cryoanesthesia.
regional anesthesia, the production of insensibility of a part by interrupting the sensory nerve conductivity from that region of the body; it may be produced by either field block or nerve block (see under block). Called also block, blockade, block a., and conduction a.
sacral anesthesia, regional anesthesia produced by injection of a local anesthetic into the extradural space of the sacral canal. Called also transsacral a. or block.see under anesthesia.
saddle block anesthesia, see under block.
segmental anesthesia, loss of sensation caused by lesions of nerve roots.
semiclosed anesthesia, general inhalation anesthesia in which there is partial rebreathing of the exhaled gases, with a carbon dioxide absorber in the circuit.
semiopen anesthesia, general inhalation anesthesia administered by use of a partially open circuit; there is partial rebreathing of the exhaled gases without a carbon dioxide absorber in the circuit.
spinal anesthesia, regional anesthesia produced by injection of a local anesthetic into the subarachnoid space around the spinal cord; cf. epidural a. Called also intraspinal a. or block and subarachnoid a. or block.see under anesthesia.loss of sensation due to a spinal lesion.
subarachnoid anesthesia, spinal a. (def. 1).
surgical anesthesia, that degree of anesthesia at which surgery may safely be performed; ordinarily used to designate such depth of general anesthesia.
tactile anesthesia, loss or impairment of the sense of touch; called also anaphia. Cf. paraphia.
thalamic hyperesthetic anesthesia, thalamic syndrome; see under syndrome.
thermal anesthesia, thermoanesthesia.
topical anesthesia, anesthesia produced by application of a local anesthetic directly to the area involved, as to the oral mucosa or the cornea.
transsacral anesthesia, sacral a.
traumatic anesthesia, loss of sensation caused by injury to a nerve.
unilateral anesthesia, hemianesthesia.
visceral anesthesia, loss or lack of the visceral sense.