Table 1.
Nitrous Oxide | Air | P | |
---|---|---|---|
Patients, n | 175 | 169 | |
Age, yr | 57 (15) | 60(14) | 0.047 |
ASA status, I/II/III* | 56/66/32 | 46/65/39 | 0.444 |
Sex, M/F | 90/85 | 94/75 | 0.433 |
Weight, kg | 73 (4) | 74 (15) | 0.528 |
Duration of surgery, h | 3.0 (1.2) | 3.4 (1.5) | 0.017 |
IV fluids administered, L | 3.9 (1.5) | 3.9 (1.8) | 0.804 |
End-tidal CO2, kPa | 4.25 (0.33) | 4.32 (0.35) | 0.489 |
End-tidal Isoflurane, % | 0.60 (0.15) | 0.61 (0.15) | 0.664 |
Mean arterial pressure, mmHg | 80 (9) | 85 (11) | <0.001 |
Heart rate, beats per min | 71 (11) | 74 (13) | 0.061 |
Values below line are averaged over the duration of surgery. Data presented as number of patients or means (SDs). * ASA status not recorded for all patients.