Skip to main content

Table 1 Calculations used to calculate variables of interest to explain the acid-base balance in healthy impala (Aepyceros melampus) undergoing immobilisation and general anaesthesia using two different drug protocols

From: Blood acid-base status in impala (Aepyceros melampus) immobilised and maintained under total intravenous anaesthesia using two different drug protocols

Variable Equation used in study Equation references Unit Ruminant values Value references
SIDa = ([Na+] + [K+] + [Ca++])-([Cl] + [Lactate]) [4, 5, 37] mEq/L Calf: 39.3 ± 4.5 [18]
Calf: 40.0 ± 2.0 [16]
SIDe = 2.46 × 10pH-8 × PaCO2 + albumin (g/dL) × (0.123 × pH – 0.631) + phosphate (mEq/L) × (0.309 × pH – 0.469) [4,5,6] mEq/L Calf: 34.8 ± 4.8 [18]
Calf: 40.0 ± 2.0 [16]
SIG = SIDa-SIDe [5, 6] mEq/L Calf: 0.0 ± 3.0 [16]
AG = ([Na+] + [K+])-([Cl] + [HCO3 ]) [4, 8, 14, 18] mEq/L Goat: 20.02 ± 0.5 [3]
Goat: 12.62 ± 1.7 [17]
Goat: 20.0 ± 3 [19]
Goat: 17.1 ± 3.9 [14]
Calf: 20.29 ± 4.5 [18]
Atot = 2.25 × albumin (g/dL) + 1.4 × globulin (g/dL) + 0.59 × Phosphate (mg/dL) [4, 5] mmol/L Calf: 18.2 ± 2.6 [18]
Calf: 19.2 ± 6.1 [16]
  1. SIDa apparent strong ion difference, SIDe effective strong ion difference, SIG strong ion gap, AG anion gap, Atot total weak acids in plasma, Na + sodium ion, K + potassium ion, Ca ++ calcium ion, Cl chloride ion, HCO 3 bicarbonate ion, g/dL grams per decilitre, mEq/L milliequivilent per litre, mg/dL milligrams per decilitre, mmol/L millimoles per litre