title: (1)H MRS in the rat brain under pentobarbital anesthesia: accurate quantification of in vivo spectra in the presence of propylene glycol.
abstract: Commercial solutions for pentobarbital anesthesia typically contain water H spectra. The purpose of the present study was to measure the concentration of metabolites in the rat brain in vivo under pentobarbital anesthesia using 1H MRS. Resonances of PG, but not ethanol, were observed in the rat brain. Chemical shifts and J-coupling constants for PG were measured at 37 degrees C and pH 7.1 and used for spectral simulation. Inclusion of the simulated PG spectrum in the basis set for LCModel analysis enabled accurate fitting of in vivo spectra. This work demonstrates that concentration of brain metabolites can be reliably measured using 1H spectroscopy under pentobarbital anesthesia. The chemical shifts and J-coupling values reported here can be used to simulate the spectrum of PG at any field strength, with various pulse sequences.
authors.affiliation: Center for Magnetic Resonance Research and Department of Radiology, University of Minnesota, Minneapolis, Minnesota 55455, USA. isabelle@cmrr.umn.edu
authors.forename: Isabelle
authors.initials: I
authors.lastname: Iltis
authors.forename: Małgorzata
authors.initials: M
authors.lastname: Marjańska
authors.forename: Fei
authors.initials: F
authors.lastname: Du
authors.forename: Dee M
authors.initials: DM
authors.lastname: Koski
authors.forename: Xiao-Hong
authors.initials: XH
authors.lastname: Zhu
authors.forename: Kâmil
authors.initials: K
authors.lastname: Ugurbil
authors.forename: Wei
authors.initials: W
authors.lastname: Chen
authors.forename: Pierre-Gilles
authors.initials: PG
authors.lastname: Henry
mesh_terms: D000818:Animals; D001921:Brain / Q000378:metabolism*; D000431:Ethanol / Q000378:metabolism; D006993:Hypnotics and Sedatives / Q000378:metabolism*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008297:Male; D010424:Pentobarbital / Q000378:metabolism*; D019946:Propylene Glycol / Q000378:metabolism*; D051381:Rats; D017207:Rats, Sprague-Dawley; D012815:Signal Processing, Computer-Assisted; D012996:Solutions
chemical_list: D006993:Hypnotics and Sedatives; D012996:Solutions; D000431:Ethanol; D019946:Propylene Glycol; D010424:Pentobarbital