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• W2847312316 abstract "Background Cerebral vasospasm as a delayed, possibly treatable sequel of subarachnoid hemorrhage (SAH) is a focus of experimental animal research. For this purpose, the rat is not a good model because of the difficulty creating a stable subarachnoid clot that persists > 1 to 2 days and could induce vasospasm. Only in rat models with a high mortality of ∼ 50% or more can SAH and its effects be investigated. Therefore, other animals than rodents are used for investigating the delayed effects of SAH. Only animal studies addressing the acute effects of SAH use rats. Objective We designed a model that allows intensive clot formation combined with low mortality to facilitate studies on the delayed effects of experimental SAH, for example, delayed vasospasm or other alterations of vessels. Methods After in vitro acceleration of the clotting process in the rats' blood by tissue factor and preliminary in vivo testing, we induced a SAH by injecting blood together with tissue factor in 22 rats. We analyzed clot expansion, length of clot persistence, chronic alterations, and histologic changes. Results The injection of blood supplemented by tissue factor led to persistent voluminous blood clots in the subarachnoid space close to the large arteries. Despite the pronounced SAH, all animals survived, allowing investigation of delayed SAH effects. All animals killed within the first 7 days after surgery had extensive clots; in some animals, the clots remained until postoperative day 12. During further clot degradation connective tissue appeared, possibly as a precursor of SAH-related late hydrocephalus. Conclusion The injection of blood together with tissue factor significantly improves SAH induction in the rat model. This rat model allows studying delayed SAH effects as found in humans." @default.
• W2847312316 created "2018-07-19" @default.
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• W2847312316 date "2018-07-04" @default.
• W2847312316 modified "2023-10-18" @default.
• W2847312316 title "Reintroduction of the Rat for Experimental Subarachnoid Hemorrhage with Accelerated Clot Formation: A Low Mortality Model with Persistent Clots as a Precondition for Studies in Vasospasm" @default.
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• W2847312316 doi "https://doi.org/10.1055/s-0038-1641561" @default.
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