| ring m. |
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 traversed by later impulses from the opposite direction that reexcite normal cardiac fibers, which can occur repetitively. There must exist either a segment of slow conduction or overall slow conduction with a locus of unidirectional block, and total conduction time in the circuit must exceed the refractory period of the fibers so that an excitable gap exists between a wavefront head and the tail of that preceding. See also reentrant mechanism, under mechanism.
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| ring p. |
a round or ring-shaped pessary.
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| ring s. |
annular s.
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| ring t. |
(for antibiotic activity): the solution is placed in a ring resting on the surface of seeded agar and the size of the surrounding clear area of inhibition indicates the activity.
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| ring u. |
fusion of foci of ulceration in the cornea to form a peripheral ring of ulceration.
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