Table 2.

Circulatory and oxygenation parameters at baseline, following induction of anesthesia in either the sitting or reclining position, and during subsequent elevation to the sitting position in the patients in whom anesthesia was induced in the reclining position.

	Position during induction	Baseline	Prior to induction (15 s)	After induction (minimum 0–4 min)	Inclination 30° (minimum 0–4 min)	Inclination 60° (minimum 0–4 min)	15–30 min following induction
ScO2	Sitting	72 ±, 7 (%)	+7 ±, 5*	+1 ±, 8*			−4 ±, 10
	Reclining	68 ±, 6 (%)	+12 ±, 4	+7 ±, 6	+3 ±, 15	−5 ±, 12#	−1 ±, 10
SmO2	Sitting	70 ±, 12 (%)	+2 ±, 7	+11 ±, 6* (Max)			+8 ±, 5
	Reclining	76 ±, 8 (%)	+1 ±, 4	+5 ±, 5 (Max)	+5 ±, 7 (Max)	+8 ±, 6# (Max)	+4 ±, 5
MAP	Sitting	104 ±, 10 (mmHg)	+3 ±, 8	−45 ±, 15*			−37 ±, 11
	Reclining	102 ±, 17 (mmHg)	−2 ±, 13	−35 ±, 12	−35 ±, 17	−36 ±, 12	−31 ±, 11
HR	Sitting	73 ±, 16 (beats/min)	+11 ±, 20	−21 ±, 11			−12 ±, 15
	Reclining	71 ±, 16 (beats/min)	+6 ±, 14	−18 ±, 11	−27 ±, 7 #	−24 ±, 9#	−21 ±, 10
SV	Sitting	91 ±, 20 (ml)	0 ±, 6	−24 ±, 14			−10 ±, 15
	Reclining	101 ±, 29 (ml)	0 ±, 15	−20 ±, 19	−10 ±, 27	−18 ±, 26	−9 ±, 30
CO	Sitting	6.5 ±, 1.1 (l/min)	+12 ±, 17	−36 ±, 16			−23 ±, 11
	Reclining	6.9 ±, 1.7 (l/min)	+5 ±, 16	−29 ±, 17	−33 ±, 18	−36 ±, 16	−29 ±, 18

All values are mean ± SD. For both groups, absolute baseline values represent a 60 s average in the sitting position. Other values are percent changes compared to baseline; averages of the 15 s interval prior to induction, and the 15–30th min after induction. Between 0 and 4 min after the induction and inclination, values represent the minimum (SmO₂: maximum) of 15 s averages.

^*Sitting vs. reclining; p < 0.05.

^#Different from the minimum value after induction; p < 0.05.