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Table 2 Blood variables from isoflurane-anesthetized horses (n = 5) breathing 50% or maximal oxygen concentrations

From: Effect of 50% and maximal inspired oxygen concentrations on respiratory variables in isoflurane-anesthetized horses

Parameter FiO2 -5 min 15 min 30 min 60 min 90 min 120 min 150 min 180 min +10 min Stand + 30 min
pHa 50% 7.446 ± 0.016 7.448 ± 0.014 7.461 ± 0.011 7.429 ± 0.008 7.409 ± 0.014 7.414 ± 0.016 7.424 ± 0.012 7.412 ± 0.016 7.375 ± 0.022 7.425 ± 0.011
  >95% 7.428 ± 0.013 7.461 ± 0.031 7.437 ± 0.032 7.424 ± 0.027 7.431 ± 0.021 7.424 ± 0.018 7.432 ± 0.014 7.441 ± 0.017 7.386 ± 0.031 7.438 ± 0.005
PaO2 (kPa) 50% 12.06 ± 0.92 12.15 ± 1.24b 12.55 ± 0.98b 13.73 ± 01.16b 13.48 ± 1.39b 12.55 ± 1.54 10.89 ± 1.43 10.29 ± 1.48 5.60 ± 0.24 12.00 ± 0.35
  >95% 12.07 ± 0.53 36.03 ± 4.02a,b 32.13 ± 4.78a,b 36.47 ± 5.93a,b 34.18 ± 5.24a,b 31.37 ± 6.32a 29.20 ± 6.12 28.61 ± 6.34 5.92 ± 0.37 10.39 ± 1.07
Arterial Hb (g/dL) 50% 13.2 ± 1.7 12.4 ± 0.4 12.0 ± 0.5 14.1 ± 0.2 13.8 ± 0.2 13.5 ± 0.5 13.0 ± 0.7 12.8 ± 0.5 12.6 ± 0.3 11.8 ± 0.5
  >95% 12.0 ± 0.5 11.9 ± 0.4 13.0 ± 0.6 13.7 ± 0.8 13.7 ± 0.3 13.6 ± 0.4 13.7 ± 0.7 13.3 ± 0.7 12.2 ± 0.6 11.5 ± 0.3
PaCO2 (kPa) 50% 4.84 ± 0.38 4.79 ± 0.30 4.63 ± 0.20 5.08 ± 0.08 5.53 ± 0.36 5.26 ± 0.25 5.11 ± 0.10 5.52 ± 0.32 6.76 ± 0.53a 5.59 ± 0.23
  >95% 5.36 ± 0.23 4.57 ± 0.45 5.25 ± 0.37 5.37 ± 0.38 5.39 ± 0.31 5.51 ± 0.16 5.57 ± 0.18 5.42 ± 0.26 6.70 ± 0.76 5.76 ± 0.20
PaHCO3 (mmol/L) 50% 26 ± 1 26 ± 0 26 ± 1 26 ± 0 26 ± 1 25 ± 1 25 ± 1 26 ± 1 27 ± 1 27 ± 1
  >95% 27 ± 1 25 ± 1 27 ± 1 26 ± 1 27 ± 0 27 ± 1 28 ± 1 28 ± 1 28 ± 0 29 ± 1
SaO2 (%) 50% 96.3 ± 0.5 95.8 ± 0.8 96.4 ± 0.4 96.4 ± 0.5 96.2 ± 0.4 95.6 ± 0.9 94.7 ± 1.3 93.4 ± 1.8 81.5 ± 1.7a 96.5 ± 0.2
  >95% 96.8 ± 0.3 97.8 ± 0.1 97.6 ± 0.1 97.6 ± 0.2 97.6 ± 0.1 97.5 ± 0.2 97.4 ± 0.3 97.0 ± 0.7 84.0 ± 2.2a 95.1 ± 0.9
pHv 50% 7.402 ± 0.010 7.418 ± 0.011 7.433 ± 0.008 7.408 ± 0.008 7.400 ± 0.011 7.398 ± 0.011 7.397 ± 0.013 7.392 ± 0.012 7.347 ± 0.015 7.387 ± 0.008
  >95% 7.399 ± 0.006 7.422 ± 0.027 7.408 ± 0.027 7.401 ± 0.024 7.397 ± 0.020 7.398 ± 0.016 7.402 ± 0.015 7.407 ± 0.016 7.352 ± 0.019 7.397 ± 0.004
PvO2 (kPa) 50% 4.44 ± 0.41 4.44 ± 0.09 4.61 ± 0.12 5.55 ± 0.22 5.64 ± 0.14 5.34 ± 0.27 4.95 ± 0.33 4.85 ± 0.29 3.72 ± 0.18 3.74 ± 0.21
  >95% 4.11 ± 0.10 4.96 ± 0.11 5.08 ± 0.16 5.88 ± 0.34a 5.79 ± 0.43a 5.71 ± 0.48a 5.43 ± 0.35 5.32 ± 0.34 3.73 ± 0.19 3.59 ± 0.26
VLactate (mmol/L) 50% 0.5 ± 0 1.1 ± 0.1 1.2 ± 0.1 1.3 ± 0.1 1.4 ± 0.1a 1.4 ± 0.1a 1.5 ± 0.1a 1.5 ± 0.1a 1.4 ± 0.1a 1.1 ± 0.2
  >95% 0.5 ± 0.1 1.2 ± 0.1 1.4 ± 0.1 1.4 ± 0.1a 1.3 ± 0.1 1.4 ± 0.1 1.5 ± 0.1a 1.5 ± 0.1a 1.4 ± 0.1a 1.2 ± 0.5
  1. Data are presented as mean ± standard error of the mean. pHa, arterial pH; PaO2, arterial partial pressure of oxygen; Arterial Hb, arterial hemoglobin; PaCO2, arterial partial pressure of carbon dioxide; PaHCO3, arterial bicarbonate; SaO2, arterial oxygen saturation; pHv, venous pH; PvO2, venous partial pressure of oxygen; vLactate, venous lactate. Time points: -5, 15, 30, 60, 90, 120, 150, and 180 represent min prior to and after induction of anesthesia; +10 min represents 10 min after disconnection from the anesthesia machine; and Stand +30 min represents 30 min after the horses stood in recovery.
  2. a Within a treatment, value is significantly different than the -5 min value for this variable.
  3. b Within this time point, value is significantly different than other treatment