Haemodynamic data for group 1 and group 2 during intermittent positive pressure ventilation (IPPV, A1 and A2), negative pressure ventilation (NPV, B1 and B2), and following reinstitution of IPPV (C2 ).
| Group 1 | Group 2 | ||||||
|---|---|---|---|---|---|---|---|
| A1 | B1 | A2 | B2 | C24-150 | |||
| Variable | IPPV | NPV | IPPV | NPV | IPPV2 | p<0.05 | |
| Haemoglobin (g/dl) | 11.8 (1.2) | 11.7 (1.3) | - | ||||
| Paco 2(kPa) | 5.1 (1.2) | 5.3 (1.3) | 5.2 (1.4) | 5.3 (1.4) | 4.9 (1.2) | - | |
| Sao 2(%) | 97.9 (2.3) | 98.1 (1.9) | 98.3 (1.1) | 98 (1.4) | 98.1 (1.5) | - | |
| CI (l/min/m2) | 4.0 (1.0) | 4.5 (1.1) | 2.8 (1.8) | 3.5 (2.2) | 3.2 (2.9) | A1 vB1; A2 vB2; A1 vA 2 | |
| Increase in CI (%) | 10.8 (7.1) | 28.1 (21) | B1 vB2 | ||||
| V˙o 2(ml/min/m2) | 166 (35) | 171 (40) | 163 (71) | 180 (68) | 180 (68) | A2 vB2; A2 vC2 | |
| MV saturation (%) | 74 (4.0) | 75.8 (3.0) | 58.9 (8) | 62.3 (9.1) | 57.5 (13.1) | A1 vB1; A1 vA2; A2 vB2; B1 vB2; B2 vC2 | |
| a-v Difference (ml/dl) | 4.23 (0.7) | 3.9 (1.2) | 6.53 (1.8) | 5.88 (1.9) | 6.87 (2.6) | A1 vB1; A1 vA2; A2 vB2; B1 vB2; B2 vC2 | |
| MAP (mm Hg) | 75 (11) | 75 (12) | 61 (7) | 59 (9) | 60 (12) | A1 vA2; B1 vB2 | |
| Heart rate (beats/min) | 108 (27) | 108 (31) | 138 (21.5) | 138 (22) | 129 (20) | A1 vA2; B1 vB2 | |
Values are mean (SD). Significant differences are indicated by p<0.05.
↵4-150 Five patients;
Paco 2, arterial carbon dioxide tension; Sao 2, systemic arterial oxygen saturation; CI, cardiac index; V˙o2, oxygen consumption; MV, mixed venous; a-v difference, arteriovenous oxygen content difference; MAP, mean arterial pressure.