Arterial blood samples were collected through a 20 G
catheter placed in the transverse facial artery. Core body temperature was
measured using an intravenous thermocouple probe
(Physiotemp Type IT-14, Physiotemp Instruments Inc.,
Clifton, NJ) passed to the level of the right atrium through
a 14 G catheter (Angiocath, Becton-Dickerson, Sandy, UT)
inserted in the left jugular vein