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The purpose of this study was to investigate whether the Central Nervous System (CNS) analgesics affect the metabolites of swine brain by nasal spraying. Single voxel proton magnetic resonance spectroscopy (1H-MRS) was performed on 9 swine. The data were post-processed using LCModel software. Before nasal spraying butorphanol tartrate, the mean Glutamate compounds (Glx) concentration was 9.276+0.542...
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