Table 2.

Affect of position on ICG measurements with paired t test mean differences +/− standard deviations and (95% confidence intervals)

Parameter	60 degree seated	Left lateral	60 degree seated	Left lateral	60 degree seated	Left lateral
	Mean ± SD	Mean ± SD	Mean ± SD	Mean ± SD	Mean ± SD	Mean ± SD
Pregnancy Stage	Antepartum (n = 26)		Intrapartum (n = 18)		Postpartum (n = 20)
Stroke Volume (ml)	78 ± 20	84 ± 24	76 ± 24	81 ± 24	70 ± 29	67 ± 22
	5.42 ± 12.71 (.29, 10.56)*		4.83 ± 22.94 (−6.57, 16.24)		−2.70 ± 21.14 (−12.13, 6.73)
Cardiac Output (l/min)	6.1 ± 1.5	6.4 ± 1.9	5.7 ± 1.6	5.8 ± 1.5	5.1 ± 2.0	5.0 ± 1.6
	0.28 ± 0.80 (−.0.43, 0.60)		0.14 ± 1.69 (−7.0, 0.98)		−0.13 ± (−0.73, 0.48)
Systemic Vascular Resistance (dynes sec/cm5)	1050 ± 313	921 ± 319	1198 ± 478	1,093 ± 314	1430 ± 617	1,324 ± 473
	−130.00 ± 123.53 (−180.99, −79.01)**		−105.33 ± 442.53 (−325.40, 114.73)		−105.70 ± 491.53 (−335.74, 124.34)
Acceleration Index (per 100 sec2)	101 ± 31	100 ± 38	101 ± 27	109 ± 23	103 ± 34	101 ± 30
	−1.15 ± 21.28 (−9.75, 7.44)		8.22 ± 20.29 (−1.87, 18.31)		−1.55 ± 23.62 (−12.44, 9.34)
Velocity Index (per 1000 sec)	61 ± 14	63 ± 18	64 ± 11	65 ± 11	61 ± 20	58 ± 14
	1.69 ± 8.41 (−1.70, 5.09)		1.06 ± 8.63 (−3.24, 5.35)		−3.15 ± 11.34 (−8.46, 2.16)
Systolic Time Ratio	0.26 ± 0.06	0.25 ± 0.03	0.27 ± 0.06	0.25 ± 0.05	0.30 ± 0.06	0.32 ± 0.12
	−0.01 ± 0.07 (−0.04, 0.01)		−0.02 ± 0.07 (0.02, −0.06)		0.03 ± 0.13 (−0.03, 0.09)
Pre-Ejection Period (msec)	76 ± 11	76 ± 8	75 ± 6	74 ± 6	77 ± 11	83 ± 16
	0.00 ± 13.49 (−5.45, 5.45)		−1.22 ± 7.70 (−5.10, 2.61)		6.00 ± 13.73 (−0.42, 12.42)
Left Ventricular Ejection Time (msec)	292 ± 31	303 ± 23	278 ± 48	292 ± 42	264 ± 56	266 ± 61
	11.92 ± 30.14 (−0.25, 24.10)		14.17 ± 59.94 (−15.64, 43.97)		1.25 ± 59.84 (−26.76, 29.26)
Thoracic Fluid Content (per kohm)	32.2 ± 3.6	32.6 ± 3.9	35.9 ± 4.1	37.0 ± 3.9	38.7 ± 4.6	39.4 ± 4.7
	0.40 ± 2.14 (−0.46, 1.26)		1.16 ± 1.24 (0.29, 0.54)**		0.66 ± 1.43 (−0.01, 1.32)

^**p value < .005;

^*p value < .05