Table 1.

Comparisons of Physiologic Parameters at Four Stages of Graded Hemodilution

	YAn (n = 14)	AAn (n = 16)	P
Baseline
Hgb, g/dl	11.5 ± 1.0	12.2 ± 1.0	0.05*
CaO2, ml/dl	15.6 ± 1.5	16.4 ± 1.4	0.12
PArtO2, mmHg	84.9 ± 8.5	80.2 ± 8.8	0.15
PArtCO2, mmHg	37.0 ± 4.4	39.3 ± 3.4	0.13
MAP, mmHg	149 ± 19	144 ± 28	0.58
TempR, °C	37.0 ± 0.4	37.0 ± 0.4	0.96
TempBr, °C	34.1 ± 0.6	34.1 ± 1.1	0.93
LDF, units	889 ± 529	886 ± 534	0.99
PBrO2, mmHg	19.6 ± 6.9	20.0 ± 8.5	0.78
Hemodil #1
Hgb, g/dl	8.6 ± 0.9	9.2 ± 1.0	0.11
CaO2, ml/dl	11.7 ± 1.3	12.4 ± 1.4	0.17
PArtO2, mmHg	86.1 ± 7.9	83.7 ± 10.7	0.50
PArtCO2, mmHg	34.5 ± 2.4	36.1 ± 2.9	0.11
MAP, mmHg	137 ± 17	136 ± 23	0.92
TempR, °C	37.3 ± 0.3	37.0 ± 0.3	0.05*
TempBr, °C	34.6 ± 0.9	34.1 ± 1.1	0.20
LDF, units	1,199 ± 676	937 ± 480	0.24
PBrO2, mmHg	19.9 ± 9.5	21.3 ± 8.7	0.68
Hemodil #2
Hgb, g/dl	6.8 ± 0.7	7.3 ± 1.0	0.16
CaO2, ml/dl	9.3 ± 0.8	9.9 ± 1.4	0.15
PArtO2, mmHg	88.9 ± 10.7	86.1 ± 10.6	0.48
PArtCO2, mmHg	33.7 ± 3.5	35.4 ± 3.4	0.19
MAP, mmHg	123 ± 10	130 ± 23	0.31
TempR, °C	37.1 ± 0.3	37.3 ± 0.5	0.14
TempBr, °C	34.6 ± 0.9	34.8 ± 0.9	0.56
LDF, units	1,176 ± 772	990 ± 454	0.42
PBrO2, mmHg	19.6 ± 10.5	21.7 ± 9.6	0.58
Hemodil #3
Hgb, g/dl	5.1 ± 0.4	5.5 ± 0.8	0.14
CaO2, ml/dl	6.9 ± 0.6	7.6 ± 1.1	0.08
PArtO2, mmHg	88.1 ± 14.0	99.3 ± 15.9	0.05*
PArtCO2, mmHg	33.8 ± 4.0	33.1 ± 2.4	0.56
MAP, mmHg	86 ± 14	116 ± 30	0.003*
TempR, °C	37.1 ± 0.3	37.0 ± 0.5	0.78
TempBr, °C	34.9 ± 0.9	34.9 ± 1.2	0.87
LDF, units	1,240 ± 803	1,089 ± 471	0.53
PBrO2, mmHg	19.3 ± 10.2	21.4 ± 10.0	0.53

Values are mean ± SD.

^*P < 0.05.

CaO₂ = arterial oxygen content; Hgb = hemoglobin concentration; LDF = laser Doppler flow; MAP = mean arterial pressure; P_ArtCO₂ = arterial partial pressure of carbon dioxide; P_ArtO₂ = arterial partial pressure of oxygen; P_BrO₂ = brain partial pressure of oxygen; Temp_Br = brain temperature; Temp_R = rectal temperature.