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- W2004451826 abstract "To study whether acute or chronic hyponatremia alters blood-brain barrier (BBB) permeability, rats made hyponatremic by constant desmopressin acetate infusion were studied by NMR spectroscopy and imaging. On constant volume ventilation and nitrous oxide, acute (1- and 2-day) and chronic (7- and 14-day) hyponatremic and normonatremic controls were infused with 0.25 M HCI. Despite reducing blood pH by at least 0.35 in <50min, brain pH, measured by 31P NMR, was unaffected in any group. As a second test of BBB function, gadolinium-DTPA (Gd-DTPA) was injected intravenously in these five groups. Coronal slice 1H NMR images obtained before and after Gd-DTPA showed image intensity changes in multiple areas outside brain, but neither control nor hyponatremic rats showed any differences in cortex, white matter or cerebellum. To ascertain whether the threshold for BBB disruption was altered, hypertonic mannitol (1.5, 2.0 or 3.0 mL) was injected rapidly into one internal carotid artery and pre- and post-Gd-DTPA images obtained. In both control and hyponatremic rats only the largest dose caused detectable Gd-DTPA leakage into brain. Thus, BBB function appears intact in both acute and chronic hyponatremia since neither H+ nor GD-DTPA penetrated the barrier and resistance to mannitol disruption was unaffected by hyponatremia." @default.
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- W2004451826 title "Effect of acute and chronic hyponatremia on blood-brain barrier function in the rat" @default.
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- W2004451826 doi "https://doi.org/10.1002/nbm.1940060203" @default.
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