Table 4

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 1Group 2
A1B1A2B2C24-150
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
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.