A Study of the contribution of changes in the cerebral blood volume to the haemodynamic response to anoxia in rat brain

• Published in: NMR in biomedicine 1997-04, Vol.10 (2), p.59-66
• Main Authors: Jones, Richard A., Harakdseth, Olav, Baptista, António M., Müller, Tomm B., Øksendal, Audun N.
• Format: Article
• Language: English
• Subjects: Animals; Biological and medical sciences; Blood Volume - drug effects; Blood Volume - physiology; Brain - blood supply; Brain - physiology; Brain - physiopathology; Cerebrovascular Circulation - physiology; Contrast Media - pharmacology; Hemodynamics - drug effects; Hemodynamics - physiology; Hypoxia, Brain - physiopathology; Ischemic Attack, Transient - physiopathology; Male; Medical sciences; Neurology; Rats; Rats, Wistar; Vascular diseases and vascular malformations of the nervous system
• ISSN: 0952-3480; 1099-1492
• DOI: 10.1002/(SICI)1099-1492(199704)10:2<59::AID-NBM415>3.0.CO;2-0

A susceptibility contrast agent which does not pass into the extra‐cellular space was used to study the effect of changes in the relative cerebral blood volume (CBV) on the haemodynamic response to anoxia, for both normal and ischaemic brain tissue, in a rat model of acute focal ischaemia. In non‐ischaemic tissue a strong CBV component was observed in the haemodynamic response, both during and after anoxia. During anoxia the change in the CBV of the non‐ischaemic tissue was estimated to be 40% in the caudate putamen and 70% in the frontal‐parietal cortex. For severely ischaemic tissue (ischaemic caudate putamen) there was no change in the CBV during anoxia while in areas of moderate ischaemia (ischaemic frontal parietal cortex) a change of 20% was observed. The effect of the contrast agent on spin‐echo images was consistent with a small reduction in the micro‐vascular blood volume of the ischaemic tissue. © 1997 John Wiley & Sons, Ltd.