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

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

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]
SIDa	= ([Na⁺] + [K⁺] + [Ca⁺⁺])-([Cl⁻] + [Lactate])	[4, 5, 37]	mEq/L	Calf: 40.0 ± 2.0	[16]
SIDe	= 2.46 × 10^pH-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]
SIDe		[4,5,6]	mEq/L	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]
Atot		[4, 5]	mmol/L	Calf: 19.2 ± 6.1	[16]

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

ISSN: 1746-6148