| saddle block anaesthesia | A form of spinal anaesthesia limited in area to the buttocks, perineum, and inner surfaces of the thighs. Synonym: saddle anaesthesia. (05 Mar 2000) |
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| heart block | <cardiology, physiology> A conduction disturbance that results in the inappropriate delay (or complete inability) of a electrical impulse, generated in the atria, to reach the ventricles (via the atrioventricular node). Clinical types are divided into first (nonserious), second and third degree (most serious) AV blocks. Some drugs may precipitate an AV block (for example clonidine, methyldopa, verapamil). A permanent pacemaker may be required for a third degree (complete) heart block. (07 Apr 1998) |
| second degree A-V block | See: atrioventricular block. (05 Mar 2000) |
| pupillary block glaucoma | Glaucoma secondary to failure of the aqueous humor to pass through the pupil to the anterior chamber. (05 Mar 2000) |
| sinoatrial block | <cardiology, physiology> Disturbance of heart conduction in which the atrial response is delayed or omitted because of partial or complete interference with the propagation of impulses from the sinoatrial node to the atria. (12 Dec 1998) |
| sinoauricular block | <cardiology, physiology> Disturbance of heart conduction in which the atrial response is delayed or omitted because of partial or complete interference with the propagation of impulses from the sinoatrial node to the atria. (12 Dec 1998) |
| spinal block | An obstruction to the flow of cerebrospinal fluid in the spinal subarachnoid space; used inaccurately to refer to spinal anaesthesia. (05 Mar 2000) |
| stellate block | Injection of local anaesthetic solution in the vicinity of the stellate ganglion. (05 Mar 2000) |
| nerve block | Interruption of the conduction of impulses in peripheral nerves or nerve trunks by the injection of a local anaesthetic solution. (12 Dec 1998) |
| nerve block anaesthesia | Conduction anaesthesia in which local anaesthetic solution is injected about nerves, nerve trunks, or nerve plexuses. (05 Mar 2000) |
| neurolytic block | <procedure> The injection of a chemical agent to cause destruction and consequent prolonged interruption of peripheral somatic or sympathetic nerves or in some cases, the neuraxis. (16 Dec 1997) |
| nondepolarising block | Skeletal mucle paralysis unaccompanied by changes in polarity of the motor endplate, as occurs following administration of tubocurarine. (05 Mar 2000) |
| suprahisian block | Atrioventricular conduction delay occurring above, or cephalad to, the bundle of His. (05 Mar 2000) |
| depolarising block | <physiology> Skeletal muscle paralysis associated with loss of polarity of the motor endplate, as occurs following administration of succinylcholine. (05 Mar 2000) |
| double thymidine block | <cell culture, procedure> A lab technique used to synchronise the cell cycles of all the cells in a culture. This is done by adding excessive amounts of thymidine (a deoxynucleoside) to the culture so that DNA replication is blocked. Eventually, all of the cells will reach the same point in the cell cycle and stop. (09 Oct 1997) |