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. Author manuscript; available in PMC: 2014 Dec 1.
Published in final edited form as: Neuroimage. 2013 Jul 10;83:10.1016/j.neuroimage.2013.07.005. doi: 10.1016/j.neuroimage.2013.07.005

Table 2.

Summary of end-tidal (Et) CO2 and O2 parameters during the physiologic maneuvers. All values are written in units of mmHg

Study 1 Study 2 Study 3
BOLD
Hypercapnia		 BOLD
Hypercapnia		 IR
Hypercapnia		 BOLD
Hyperoxia		 PCASL
Hypercapnia
Room 5% Room 5% Room 5% Room 98% Room 5%
Air CO2 air CO2 air CO2 air O2 air CO2
Et-CO2 Et-CO2 Et-CO2 Et-CO2 Et-CO2 Et-CO2 Et-O2 Et-O2 Et-CO2 Et-CO2
40±4 49±3 41±2 49±2 40±2 49±2 121±4 664±21 40±4 49±2

p<0.001 for all comparisons between the room air and the CO2/O2 gas mixture.