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Volumetric variables in sheep breathing spontaneously, or subjected to mechanical ventilation, or pneumonectomy |
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| Parameter |
SB (n = 48) |
MV (n = 51) |
PE (n = 42) |
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| ITBVI (ml/m2) |
856 ± 106 |
804 ± 129 |
635 ± 116b,c |
| GEDVI (ml/m2) |
654 ± 92 |
551 ± 91b |
461 ± 97b,c |
| PBVI (ml/m2) |
202 ± 32 |
253 ± 56b |
176 ± 41b,c |
| ITBV:GEDV ratio |
1.313 ± 0.063 |
1.463 ± 0.089b |
1.389 ± 0.101b,c |
| Correlation between ITBVI and GEDVa |
0.96 |
0.93 |
0.95 |
| Regression equation |
ITBVI = 1.16 × GEDVI + 92.45 |
ITBVI = 1.43 × GEDVI + 13.48 |
ITBVI = 1.21 × GEDVI + 73.72 |
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SB, spontaneous breathing; MV, mechanical ventilation with tidal volumes of 6 to 8 ml/kg and positive end-expiratory pressure 2 cmH2O; PE, pneumonectomy; ITBVI, intrathoracic blood volume index; GEDVI, global end-diastolic volume index; PBVI, pulmonary blood volume index; ITBV, intrathoracic blood volume; GEDV, global end-diastolic volume. All data are distributed normally and are presented as means ± SD. aPearson coefficient, r (p < 0.0001). bp < 0.05 compared with SB; cp < 0.05 compared with MV (analysis of variance followed by Scheffe's test). | |||
Kirov et al. Critical Care 2006 10:415 doi:10.1186/cc4989 |
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