Online-Ressource | |
Verfasst von: | Rebel, Annette [VerfasserIn] |
Lenz, Christian [VerfasserIn] | |
Krieter, Heinrich [VerfasserIn] | |
Waschke, Klaus F. [VerfasserIn] | |
Ackern, Klaus van [VerfasserIn] | |
Kuschinsky, Wolfgang [VerfasserIn] | |
Titel: | Oxygen delivery at high blood viscosity and decreased arterial oxygen content to brains of conscious rats |
Verf.angabe: | A. Rebel, C. Lenz, H. Krieter, K. F. Waschke, K. Van Ackern, W. Kuschinsky |
E-Jahr: | 2001 |
Jahr: | [2001] |
Umfang: | 7 S. |
Illustrationen: | Diagramme |
Teil: | volume:280 |
year:2001 | |
number:6 | |
month:06 | |
pages:2591-2597 | |
extent:7 | |
Fussnoten: | Gesehen am 19.05.2021 |
Titel Quelle: | Enthalten in: American journal of physiology / Heart and circulatory physiology |
Ort Quelle: | Bethesda, Md. : American Physiological Society, 1977 |
Jahr Quelle: | 2001 |
Band/Heft Quelle: | 280(2001,6), Seite H2591-H2597 |
ISSN Quelle: | 1522-1539 |
Abstract: | We addressed the question to which extent cerebral blood flow (CBF) is maintained when, in addition to a high blood viscosity (Bvis) arterial oxygen content (CaO2) is gradually decreased. CaO2 was decreased by hemodilution to hematocrits (Hct) of 30, 22, 19, and 15% in two groups. One group received blood replacement (BR) only and served as the control. The second group received an additional high viscosity solution of polyvinylpyrrolidone (BR/PVP). Bvis was reduced in the BR group and was doubled in the BR/PVP. Despite different Bvis, CBF did not differ between BR and BR/PVP rats at Hct values of 30 and 22%, indicating a complete vascular compensation of the increased Bvis at decreased CaO2. At an Hct of 19%, local cerebral blood flow (LCBF) in some brain structures was lower in BR/PVP rats than in BR rats. At the lowest Hct of 15%, LCBF of 15 brain structures and mean CBF were reduced in BR/PVP. The resulting decrease in cerebral oxygen delivery in the BR/PVP group indicates a global loss of vascular compensation. We concluded that vasodilating mechanisms compensated for Bvis increases thereby maintaining constant cerebral oxygen delivery. Compensatory mechanisms were exhausted at a Hct of 19% and lower as indicated by the reduction of CBF and cerebral oxygen delivery. |
DOI: | doi:10.1152/ajpheart.2001.280.6.H2591 |
URL: | Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt. Volltext ; Verlag: https://doi.org/10.1152/ajpheart.2001.280.6.H2591 |
Volltext: https://journals.physiology.org/doi/full/10.1152/ajpheart.2001.280.6.H2591 | |
DOI: https://doi.org/10.1152/ajpheart.2001.280.6.H2591 | |
Datenträger: | Online-Ressource |
Sprache: | eng |
K10plus-PPN: | 1758159456 |
Verknüpfungen: | → Zeitschrift |