Abstract
It has been suggested that intravenous injections of hypertonic contrast media when used in computed tomography and digital subtraction angiography might raise plasma osmolality sufficiently to open the blood-brain barrier (BBB). The current investigation establishes the threshold of plasma osmolality that causes the the opening of the BBB in euvolemic and dehydrated rabbits. Euvolemic rabbits were allowed food and water ad libitum. Dehydrated rabbits received 4.0 mg/kg of furosemide intramuscularly and were deprived of water for 72 hours. Meglumine/sodium diatrizoate 76 per cent (n = 28) or mannitol 20 per cent (n = 12) was administrated intravenously, at a rate of 25 mmol/kg body weight/hour for 2, 3 or 4 hours. Plasma osmolality, blood iodine concentration, blood pressure, heart rate and hematocrit were assessed at regular intervals. Evans blue and 99Tcm-DTPA were used simultaneously as tracers for BBB opening. Rating of BBB opening with 99Tcm-DTPA correlated well with Evans blue staining (r = 0.863, p less than 0.001; n = 42). BBB opening was related to plasma osmolality and was similar for both contrast media and mannitol. Widespread BBB opening occurred above 400 mmol/kg while focal BBB opening occurred above 370 mmol/kg....Continue Reading
References
Apr 1, 1979·Radiology·L A HaymanV C Hinck
May 1, 1979·Radiology·J M DavisR C Pfister
Aug 1, 1979·The Journal of Clinical Investigation·E A NeuweltP A Barnett
Jul 1, 1979·Investigative Radiology·K Golman
Oct 1, 1977·Archives of Neurology·J C LoZito
Jul 1, 1975·Radiology·R L Waldron, R N Bryan
Sep 1, 1985·Neurology·R VelajE Fram
Dec 15, 1973·The Journal of Comparative Neurology·M W BrightmanE Westergaard
Jun 1, 1974·Diabetes·A I Arieff, H J Carroll
Jul 1, 1972·Investigative Radiology·A A MossJ A Nelson
May 1, 1983·Radiology·D F GuthanerW R Brody
Jun 1, 1984·AJR. American Journal of Roentgenology·M KinnisonG M Williams
Dec 1, 1980·AJR. American Journal of Roentgenology·P C ChristensonH Roehrig
Jul 1, 1983·Radiology·G J DeFilippI I Kricheff
Nov 1, 1980·Investigative Radiology·R E Gonsette, L Liesenborgh
Feb 1, 1982·Journal of Computer Assisted Tomography·R RaininkoP Kangasniemi
Nov 1, 1980·Radiology·W R Scott
Apr 30, 1949·Acta Radiologica·T BROMAN, O OLSSON
Citations
May 9, 2014·AJNR. American Journal of Neuroradiology·H MoralesT Tomsick
Jan 1, 1994·Acta Oto-laryngologica. Supplementum·K ToriharaT Nagai
Aug 1, 2015·AJNR. American Journal of Neuroradiology·T A TomsickUNKNOWN IMS III Investigators
Oct 1, 1991·Immunological Reviews·K Hayakawa, R R Hardy