Table 3.
Haemodynamic variables during PLR
| P values | ||||||||
|---|---|---|---|---|---|---|---|---|
| Before PLR | During PLR | % Change from baseline | During PLR vs. before PLR | Failed SBT vs. succeeded SBT before PLR | Failed SBT vs. succeeded SBT during PLR | Cases without WiPO vs. cases with WiPO before PLR | Cases without WiPO vs. cases with WiPO during PLR | |
| Heart rate (beats/min) | ||||||||
| Succeeded SBT (n = 40) | 84 ± 17 | 86 ± 16 | 4 ± 10 % | 0.03 | ||||
| Failed SBT (n = 45) | 91 ± 18 | 94 ± 19 | 3 ± 10 % | 0.06 | 0.05 | 0.04 | ||
| Cases with WiPO (n = 30) | 90 ± 16 | 93 ± 17 | 4 ± 12 % | 0.15 | ||||
| Cases without WiPO (n = 15) | 94 ± 22 | 96 ± 22 | 3 ± 6 % | 0.07 | 0.49 | 0.59 | ||
| Systolic arterial pressure (mmHg) | ||||||||
| Succeeded SBT (n = 40) | 133 ± 24 | 141 ± 23 | 6 ± 8 % | <0.01 | ||||
| Failed SBT (n = 45) | 125 ± 20 | 130 ± 21 | 5 ± 10 % | <0.01 | 0.10 | 0.04 | ||
| Cases with WiPO (n = 30) | 129 ± 18 | 135 ± 18 | 6 ± 8 % | <0.01 | ||||
| Cases without WiPO (n = 15) | 117 ± 23 | 120 ± 25 | 3 ± 12 % | 0.35 | 0.07 | 0.03 | ||
| Mean arterial pressure (mmHg) | ||||||||
| Succeeded SBT (n = 40) | 89 ± 16 | 95 ± 17 | 8 ± 10 % | <0.01 | ||||
| Failed SBT (n = 45) | 86 ± 12 | 91 ± 13 | 6 ± 11 % | <0.01 | 0.40 | 0.18 | ||
| Cases with WiPO (n = 30) | 88 ± 12 | 94 ± 12 | 7 ± 9 % | <0.01 | ||||
| Cases without WiPO (n = 15) | 83 ± 14 | 85 ± 12 | 3 ± 14 % | 0.53 | 0.24 | 0.03 | ||
| Diastolic arterial pressure (mmHg) | ||||||||
| Succeeded SBT (n = 40) | 64 ± 12 | 68 ± 12 | 7 ± 12 % | 0.05 | ||||
| Failed SBT (n = 45) | 64 ± 9 | 69 ± 10 | 9 ± 12 % | <0.01 | 0.79 | 0.85 | ||
| Cases with WiPO (n = 30) | 64 ± 9 | 71 ± 10 | 11 ± 11 % | <0.01 | ||||
| Cases without WiPO (n = 15) | 63 ± 9 | 65 ± 9 | 4 ± 13 % | 0.36 | 0.79 | 0.09 | ||
| Cardiac index (L/min/m2) | ||||||||
| Succeeded SBT (n = 40) | 3.4 ± 0.7 | 3.7 ± 0.7 | 15 ± 13 % | <0.01 | ||||
| Failed SBT (n = 45) | 3.5 ± 0.8 | 3.8 ± 1.0 | 7 ± 16 % | 0.01 | 0.24 | 0.64 | ||
| Cases with WiPO (n = 30) | 3.7 ± 0.9 | 3.8 ± 0.9 | 3 ± 7 % | 0.06 | ||||
| Cases without WiPO (n = 15) | 3.2 ± 0.6 | 3.7 ± 1.2 | 17 ± 24 % | 0.02 | 0.03 | 0.60 | ||
| Cases with increase in cardiac index ≥10 % during PLR | ||||||||
| Succeeded SBT (n = 40) | 28 (70 %) | |||||||
| Failed SBT (n = 45) | 10 (22 %) | <0.01 | ||||||
| Cases with WiPO (n = 30) | 2 (7 %) | |||||||
| Cases without WiPO (n = 15) | 8 (53 %) | <0.01 | ||||||
Values are expressed as mean ± standard deviation or number and frequency (%)
PLR passive leg raising, SBT spontaneous breathing trial, WiPO weaning-induced pulmonary oedema