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penumbra, (from Latin paene, “almost”; umbra, “shadow”), in astronomy, the outer part of a conical shadow cast by a celestial body, in which the light from the source is partially blocked—as compared to the umbra (q.v.), the shadow’s darkest, central part, where the light is totally excluded. During an eclipse of the Sun, an ...
Mar 28, 2024 · Ischemic penumbra denotes the part of an acute ischemic stroke that is at risk of progressing to infarction but is still salvageable if reperfused. It is usually located around an infarct core which represents the tissue which has already infarcted or is going to infarct regardless of reperfusion. The primary aim of current acute stroke ...
Penumbra definition: the partial or imperfect shadow outside the complete shadow of an opaque body, as a planet, where the light from the source of illumination is only partly cut off.
Penumbra. The rights guaranteed by implication in a constitution or the implied powers of a rule. The original and literal meaning of penumbra is "a space of partial illumination between the perfect shadow … on all sides and the full light" ( Merriam Webster's Collegiate Dictionary, 10th ed., 1996). The term was created and introduced by ...
noun figuratively An area that lies on the edge of something; a fringe. noun Something related to, connected to, and implied by, the existence of something else that is necessary for the second thing to be full and complete in its essential aspects. noun medicine (in " ischaemic penumbra", after a stroke) A region of the brain that has lost ...
Background and Purpose —The ischemic core and penumbra have not been thoroughly characterized after acute cerebral thromboembolic occlusion in humans. Differentiation between areas of potentially viable and irreversibly injured ischemic tissue may facilitate assessment and treatment of stroke patients. Methods —Cerebral blood flow (CBF) was ...
Feb 10, 2016 · The minimal-reperfusion group were used to define the extent of penumbra, as the corresponding infarct area at 24 h represented the sum of baseline penumbra and core.
