Measured brain metabolite ratios

Anatomic Region	Group	Metabolite Ratios, Mean ± SD
Anatomic Region	Group	Lactate/Choline	Lactate/NAA	NAA/Choline
Basal ganglia	Nonsedation	0.12 ± 0.05^*	0.32 ± 0.15^†	0.40 ± 0.10
	Sedation	0.10 ± 0.04^*	0.24 ± 0.10^†	0.42 ± 0.06
Thalamus	Nonsedation	0.08 ± 0.05	0.20 ± 0.18	0.44 ± 0.10
	Sedation	0.07 ± 0.03	0.17 ± 0.06	0.44 ± 0.08
Corticospinal tract	Nonsedation	0.12 ± 0.05	0.25 ± 0.11	0.51 ± 0.19
	Sedation	0.13 ± 0.06	0.26 ± 0.14	0.52 ± 0.10

Note:—NAA indicates N-acetylaspartate.
* Significant difference between the nonsedation and sedation groups (P = .03).
† Significant difference between the nonsedation and sedation groups (P = .01).