(1)H MRS in the rat brain under pentobarbital anesthesia: accurate quantification of in vivo spectra in the presence of propylene glycol.
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.
Iltis
Isabelle
I
Center for Magnetic Resonance Research and Department of Radiology, University of Minnesota, Minneapolis, Minnesota 55455, USA. isabelle@cmrr.umn.edu
Marjańska
Małgorzata
M
Du
Fei
F
Koski
Dee M
DM
Zhu
Xiao-Hong
XH
Ugurbil
Kâmil
K
Chen
Wei
W
Henry
Pierre-Gilles
PG
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
D006993:Hypnotics and Sedatives; D012996:Solutions; D000431:Ethanol; D019946:Propylene Glycol; D010424:Pentobarbital