title: Persistent penumbra in a rabbit stroke model: incidence and histologic characteristics.
abstract: Duration and extent of penumbra determine the window and brain volume in which interventions may save injured tissue after stroke. Understanding the penumbra in animals is necessary in order to design models that translate to effective clinical therapies. New Zealand white rabbits were embolized with aged autologous clot (n = 23) or insoluble microspheres (n = 21). To examine effects of treatment on penumbra, sphere-stroked animals were treated with 3 μm microbubbles plus ultrasound (n = 19). Rabbits were euthanized at 4 or 24 hr. Infarct volume was measured following triphenyltetrazolium chloride (TTC) staining of brain sections. Penumbra was visualized using immunostaining of pimonidazole injected fifteen minutes prior to euthanasia. Potentially reversible penumbra was present in 14.3% stroked rabbits at 4 hours and 15.7% at 24 hours after embolic stroke and represented up to 35% of total lost tissue. Intervention at up to 24 hours may benefit a significant patient population.
authors.affiliation: Department of Pathology, College of Medicine, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA.
authors.forename: Leah J
authors.initials: LJ
authors.lastname: Hennings
authors.forename: Rene
authors.initials: R
authors.lastname: Flores
authors.forename: Paula K
authors.initials: PK
authors.lastname: Roberson
authors.forename: Aliza
authors.initials: A
authors.lastname: Brown
authors.forename: John
authors.initials: J
authors.lastname: Lowery
authors.forename: Michael
authors.initials: M
authors.lastname: Borrelli
authors.forename: William C
authors.initials: WC
authors.lastname: Culp