- reentry mechanism the mechanism by which a locus of unidirectional block to conduction in cardiac muscle can result in ectopic beats or tachyarrhythmias. In addition to the block, also required are at least areas of slow conduction and refractoriness of the tissue to stimulation. Conduction of a normally initiated impulse is delayed by the block long enough for normal surrounding tissue to repolarize and to be reexcited by the delayed impulse; this may begin a self-perpetuating series of abnormal conduction cycles. See also ring model, leading circle model, and figure-of-eight model, under model, and see reentry.
Medical dictionary. 2011.
Look at other dictionaries:
reentrant pathway — the pathway over which over which an impulse is conducted in reentry (q.v); see also reentrant mechanism, under mechanism … Medical dictionary
Reentrant mutex — A reentrant mutex is a mutual exclusion mechanism. In a reentrant mutex, the same thread can acquire the lock multiple times. However, the lock must be released the same number of times or else other threads will be unable to acquire the lock … Wikipedia
reentry — Return of the same impulse into a zone of heart muscle that it has recently activated, sufficiently delayed that the zone is no longer refractory, as seen in most ectopic beats, reciprocal rhythms, and most tachycardias. * * * re·en·try ( )rē en… … Medical dictionary
ring model — in cardiology, a model describing the mechanism of anatomical reentry, based on a circuit that is formed around an impenetrable barrier to propagation and contains a locus of slow conduction. The locus blocks the initial normal impulse but is… … Medical dictionary
reciprocal rhythm — a cardiac dysrhythmia established by a sustained reentrant mechanism in which impulses traveling back toward the atria through the atrioventricular junction also travel forward to reexcite the ventricles; thus each cycle contains a reciprocal… … Medical dictionary
reciprocating tachycardia — a tachycardia due to a reentrant mechanism and characterized by a reciprocating rhythm (q.v.) … Medical dictionary
drug — drug1 /drug/, n., v., drugged, drugging. n. 1. Pharm. a chemical substance used in the treatment, cure, prevention, or diagnosis of disease or used to otherwise enhance physical or mental well being. 2. (in federal law) a. any substance… … Universalium
Drug — /droog/, n. Zoroastrianism. the cosmic principle of disorder and falsehood. Cf. Asha. [ < Avestan drauga] * * * I Any chemical agent that affects the function of living things. Some, including antibiotics, stimulants, tranquilizers,… … Universalium
Burroughs large systems — The Burroughs large systems were the largest of three series of Burroughs Corporation mainframe computers. Founded in the 1880s, Burroughs was the oldest continuously operating entity in computing, but by the late 1950s its computing equipment… … Wikipedia
Supraventricular tachycardia — Classification and external resources Lead II electrocardiogram strip showing SVT with a heart rate of about 150. ICD 10 I … Wikipedia