bundle-branch block

bundle-branch block

n. Abbr. BBB

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.

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block

1. an obstruction or stoppage.

2. regional anesthesia.

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Arthur block

see segmental dorsolumbar epidural block.

bundle-branch block

a form of heart block involving obstruction in one of the branches in the bundle of His.

field block

regional anesthesia obtained by blocking conduction in nerves with chemical or physical agents.

block grazing

see rotational grazing.

heart block

impairment of conduction in heart excitation; often applied specifically to atrioventricular heart block. See also heart block.

inverted L-block

linear infiltration cranial and dorsal to the incision site; used for flank laparotomy in cattle and sheep.

block mating

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.

metabolic block

the blocking of a biosynthetic pathway due to a genetic enzyme defect or to inhibition of an enzyme by a drug or other substance.

nerve block

regional anesthesia secured by injection of an anesthetic in close proximity to the appropriate nerve.

paracervical block

anesthesia of the inferior hypogastric plexus and ganglia produced by injection of the local anesthetic into the lateral fornices of the vagina.

parasacral block

regional anesthesia produced by injection of a local anesthetic around the sacral nerves as they emerge from the sacral foramina.

presacral block

anesthesia produced by injection of the local anesthetic into the sacral nerves on the anterior aspect of the sacrum.

ring block

regional anesthesia by the injection of local anesthetic in a complete circle around a limb of a horse, or the teat of a cow.

sacral block

anesthesia produced by injection of the local anesthetic into the extradural space of the spinal canal.

saddle block

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.

sinus block

sinus arrest.

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.