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- W2019959327 abstract "Partially purified protein from washed and artificially hemolyzed erythrocytes, known to cause significant contractions of isolated canine cerebral vessels in vitro, was injected into the cisterna magna of intact anesthetized dogs. Cerebral blood flow, measured by the xenon-133 washout technique, decreased from a control value of 49.5 +/- 1.17 ml/100 gm/min to an experimental value of 34.1 +/- 1.65 ml/100 gm/min at 2 hours. Cerebral vascular resistance rose from a control value of 2.05 +/- 0.17 PRU (peripheral resistance units) to an experimental value of 2.91 +/- 0.25 PRU at 2 hours. Mean arterial blood pressure, heart rate, intracranial pressure, and cerebral perfusion pressure remained stable. Cardiac output also fell significantly (in 2-hour control animals it was 2.89 +/- 0.37 liter/min, and in 2-hour experimental animals 1.43 +/- 0.13 liter/min) and peripheral vascular resistance rose. These changes were evident by 10 minutes after the cisternal injection of the hemolysate protein, and remained for the duration of the 2-hour monitoring period. Serial vertebrobasilar angiograms demonstrated marked narrowing of the intracranial basilar artery when compared to control values. The narrowing persisted for several days in most animals, and tended to increase with time. Relaxation occurred by the 10th through the 14th day. The authors conclude that this experimental preparation may be a useful model for both in vitro and in vivo investigation of chronic cerebral vasospasm." @default.
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- W2019959327 date "1983-03-01" @default.
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- W2019959327 title "In vivo characterization of vasocontractile activities in erythrocytes" @default.
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- W2019959327 doi "https://doi.org/10.3171/jns.1983.58.3.0356" @default.
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