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Table 1.

In vivo arterial blood gases, acid—base parameters and haematological parameters of fasting and digesting snakes (Python molurus)

ExperimentBefore feeding (0 h)After feeding (48 h)Control (0 h)Control (48 h)
PaO2 (kPa) 9.98±0.40 (9) 9.54±0.59 (9) 9.49±1.19 (5) 10.22±0.60 (4) 
pHa 7.60±0.02 (9) 7.62±0.03 (9) 7.55±0.02 (5) 7.57±0.01 (4) 
PaCO2 (kPa) 2.21±0.13 (9) 2.89±0.17(9)* 2.88±0.27 (5) 2.70±0.20 (4) 
[HCO3-]pl (mmol l-117.0±0.7 (9) 23.3±1.2(9)* 19.7±1.4 (5) 19.3±0.9 (4) 
Hct (%) 19.2±0.8 (9) 16.5±0.7(9)* 22.1±0.9 (5) 15.8±1.3(5)* 
CO2 (mmol l-13.62±0.17(9) 2.97±0.13(9)* 3.83±0.44 (5) 3.10±0.45(4)* 
Osmolality (mOsm) 277.2±1.2 (9) 296.8±2.0(9)* 273.0±1.8 (5) 286.3±4.3 (3) 
[Na+]pl (mmol l-1150.8±3.5 (9) 158.7±2.9 (9) 147.2±4.1 (4) 151.2±5.4 (3) 
[K+]pl (mmol l-13.8±0.1 (9) 3.4±0.1(9)* 3.7±0.1 (4) 3.9±0.2 (3) 
[Cl-]pl (mmol l-1109.1±1.7 (9) 99.0±1.8(9)* 109.1±2.2 (5) 112.0±1.8 (3) 
ExperimentBefore feeding (0 h)After feeding (48 h)Control (0 h)Control (48 h)
PaO2 (kPa) 9.98±0.40 (9) 9.54±0.59 (9) 9.49±1.19 (5) 10.22±0.60 (4) 
pHa 7.60±0.02 (9) 7.62±0.03 (9) 7.55±0.02 (5) 7.57±0.01 (4) 
PaCO2 (kPa) 2.21±0.13 (9) 2.89±0.17(9)* 2.88±0.27 (5) 2.70±0.20 (4) 
[HCO3-]pl (mmol l-117.0±0.7 (9) 23.3±1.2(9)* 19.7±1.4 (5) 19.3±0.9 (4) 
Hct (%) 19.2±0.8 (9) 16.5±0.7(9)* 22.1±0.9 (5) 15.8±1.3(5)* 
CO2 (mmol l-13.62±0.17(9) 2.97±0.13(9)* 3.83±0.44 (5) 3.10±0.45(4)* 
Osmolality (mOsm) 277.2±1.2 (9) 296.8±2.0(9)* 273.0±1.8 (5) 286.3±4.3 (3) 
[Na+]pl (mmol l-1150.8±3.5 (9) 158.7±2.9 (9) 147.2±4.1 (4) 151.2±5.4 (3) 
[K+]pl (mmol l-13.8±0.1 (9) 3.4±0.1(9)* 3.7±0.1 (4) 3.9±0.2 (3) 
[Cl-]pl (mmol l-1109.1±1.7 (9) 99.0±1.8(9)* 109.1±2.2 (5) 112.0±1.8 (3) 

Data for snakes that were not fed but sampled at a 48 h interval are also included (unfed control).

PaO2, arterial O2 partial pressure; pHa, arterial pH; PaCO2, arterial CO2 partial pressure; [HCO3-]pl,concentration of plasma bicarbonate; Hct, haematocrit; CO2, total concentration of oxygen in whole blood; [Na+]pl, sodium concentration in plasma;[K+]pl, potassium concentration in plasma;[Cl-]pl, chloride concentration in plasma.

Values are means ± S.E.M. (N).

*

signifies statistical difference between 0 h and 48 h values at P≤0.05.

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