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bun·dle-branch block (BBB),
intraventricular block due to interruption of conduction in one of the two main branches of the atrioventricular bundle and manifested in the electrocardiogram by marked prolongation of the QRS complex; block of each branch has distinctive QRS morphology.
bundle-branch blockA defect in the passage of electrical impulses through either the right or left branches that divide from the bundle of His, which supply the “wiring” for the right and left ventricles, often resulting in delayed conduction though either bundle branch.
Generally asymptomatic; if symptomatic, fainting, slowed heart rate.
Cardiomyopathy, myocarditis, infarction, post-surgery.
Intraventricular block due to interruption of conduction in one of the two main branches of the bundle of His and manifested in the electrocardiogram by marked prolongation of the QRS complex. Block to each branch has distinctive QRS morphology.
1. an obstruction or stoppage.
2. regional anesthesia.
see segmental dorsolumbar epidural block.
a form of heart block involving obstruction in one of the branches in the bundle of His.
regional anesthesia obtained by blocking conduction in nerves with chemical or physical agents.
see rotational grazing.
impairment of conduction in heart excitation; often applied specifically to atrioventricular heart block. See also heart block.
linear infiltration cranial and dorsal to the incision site; used for flank laparotomy in cattle and sheep.
mating of all the females in a group during a brief period, e.g. within the span of three estral cycles; a characteristic of seasonal animal farming.
the blocking of a biosynthetic pathway due to a genetic enzyme defect or to inhibition of an enzyme by a drug or other substance.
regional anesthesia secured by injection of an anesthetic in close proximity to the appropriate nerve.
anesthesia of the inferior hypogastric plexus and ganglia produced by injection of the local anesthetic into the lateral fornices of the vagina.
regional anesthesia produced by injection of a local anesthetic around the sacral nerves as they emerge from the sacral foramina.
anesthesia produced by injection of the local anesthetic into the sacral nerves on the anterior aspect of the sacrum.
regional anesthesia by the injection of local anesthetic in a complete circle around a limb of a horse, or the teat of a cow.
anesthesia produced by injection of the local anesthetic into the extradural space of the spinal canal.
the production of anesthesia in a region corresponding roughly with the areas of the buttocks, perineum and inner aspects of the thighs, by introducing the anesthetic agent low in the dural sac.
vagal block, vagus nerve block
blocking of vagal impulses by injection of a solution of local anesthetic into the vagus nerve at its exit from the skull.