Abstract
Mannitol and furosemide treatment of ischaemic brain oedema caused by middle cerebral artery occlusion (MCAO) was studied by MRI in 87 rats. MRI was performed in all rats before and 30–360 min after drug infusion. The examinations were performed in the presence of an intact blood-brain barrier (BBB) 6 h after MCAO, and 3 days after MCAO at the time of maximal disruption of the BBB. Spin echo (SE) sequences were used for imaging and for determination of the relaxation times T1 and T2. Subtraction images were constructed. Furosemide dehydrated healthy and ischaemic brain. Mannitol had no dehydrating effect on healthy brain tissue. However, when the BBB was disrupted in severe oedema mannitol produced a decrease in water content, a shortening of T1 and T2, and a decrease in intracranial pressure (ICP), while in less severe oedema mannitol could increase brain water content, thus aggravating ICP. The subtraction technique allowed visualisation of the transient change in bulk in water animals with disruption of the BBB after mannitol treatment.
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Thuomas, K.Å., Kotwica, Z. & Persson, L. The effects of mannitol and furosemide on brain water changes in normal and MCA-occluded rats: a magnetic resonance study. Eur. Radiol. 4, 125–132 (1994). https://doi.org/10.1007/BF00231198
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DOI: https://doi.org/10.1007/BF00231198