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Table 1.

The effects of increasing intra-abdominal pressure in restingVaranus exanthematicus

Resting PIA (3.27±1.13 mmHg)Double PIA (7.04±0.60 mmHg)Triple PIA (9.83±0.27 mmHg)
Heart rate 61.2±6.0 65.0±3.8 77.3±4.3* 
PCV (mmHg) 4.25±0.41 6.98±0.50 10.75±0.63 
a (cmH2O) 54.93±4.96 55.77±6.19 55.96±7.78 
PRA (mmHg) 2.23±0.58 5.43±0.74 8.87±0.82 
PTRANS (mmHg) 2.76±0.90 -0.69±0.44 1.74±0.99* 
PC (%Δ) 100 51.98±15.74* 94.84±19.09 
VTI (ml kg-116.83±1.53 9.95±2.76 10.03±3.09 
fb (min-11.57±0.21 4.00±0.44* 5.50±1.80* 
E (ml min-1kg-127.22±5.63 36.94±9.92 38.55±11.56 
Resting PIA (3.27±1.13 mmHg)Double PIA (7.04±0.60 mmHg)Triple PIA (9.83±0.27 mmHg)
Heart rate 61.2±6.0 65.0±3.8 77.3±4.3* 
PCV (mmHg) 4.25±0.41 6.98±0.50 10.75±0.63 
a (cmH2O) 54.93±4.96 55.77±6.19 55.96±7.78 
PRA (mmHg) 2.23±0.58 5.43±0.74 8.87±0.82 
PTRANS (mmHg) 2.76±0.90 -0.69±0.44 1.74±0.99* 
PC (%Δ) 100 51.98±15.74* 94.84±19.09 
VTI (ml kg-116.83±1.53 9.95±2.76 10.03±3.09 
fb (min-11.57±0.21 4.00±0.44* 5.50±1.80* 
E (ml min-1kg-127.22±5.63 36.94±9.92 38.55±11.56 

The effects of increasing intra-abdominal pressure(PIA) on heart rate, central venous pressure(PCV), mean arterial pressure(a), right atrial pressure(PRA), post cava transmural pressure(PTRANS), proportion (%) change in venous return (i.e. post caval vein blood flow, PC) relative to resting values, inspired tidal volume (VTI), breathing frequency(fb) and minute ventilation(E) in resting Varanus exanthematicus. Data presented are means ± s.e.m.(N=5). Asterisks represent results of Bonferroni's corrected paired t-tests between resting and elevated PIA.

*

P<0.05

P<0.01

P<0.001. 1 mmHg=133.3 Pa; 1 cmH2O=98.1 Pa

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