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Table 4 Contributors to systemic venous–arterial CO2 to arterial–venous O2 content difference ratio (Cv-aCO2/Ca-vO2) (n = 255)

From: Regional venous–arterial CO2 to arterial–venous O2 content difference ratio in experimental circulatory shock and hypoxia

Parameters

β

95% CI

p value

Renal Cv-aCO2/Ca-vO2

0.148

0.062 to 0.234

0.001

Spleen Cv-aCO2/Ca-vO2

0.065

0.002 to 0.127

0.042

Gut Cv-aCO2/Ca-vO2

0.117

0.025 to 0.209

0.013

Liver Cv-aCO2/Ca-vO2

− 0.159

− 0.297 to − 0.022

0.023

Hepatosplanchnic Cv-aCO2/Ca-vO2

0.495

0.205 to 0.786

0.001

MAP-CVP (mmHg)

− 0.001

− 0.002 to 0.001

0.364

Base excess kidney vein (mmol/l)

0.001

− 0.012 to 0.014

0.873

Renal O2ER

− 0.025

− 0.271 to 0.221

0.843

Lactate kidney vein (mmol/l)

− 0.043

− 0.171 to 0.085

0.510

Renal lactate gradient (mmol/l)

0.104

− 0.036 to 0.245

0.144

Spleen lactate gradient (mmol/l)

0.037

− 0.051 to 0.124

0.411

Gut O2ER

0.089

− 0.164 to 0.342

0.489

Lactate mesenteric vein (mmol/l)

0.043

− 0.074 to 0.160

0.474

pO2 hepatic vein (mmHg)

0.002

− 0.005 to 0.009

0.563

Total hepatic blood flow (ml/kg/min)

− 0.001

− 0.009 to 0.006

0.729

Hepatic O2ER

0.132

− 0.174 to 0.438

0.397

Hepatic lactate uptake (µmol/kg/min)

0.000

− 0.007 to 0.007

0.969

Hepatosplanchnic lactate uptake (µmol/kg/min)

0.007

0.000 to 0.015

0.059

Lactate hepatic vein − hepatic artery (µmol/l)

0.075

− 0.122 to 0.271

0.456

  1. β = unstandardized coefficient, CI = confidence interval, Cv-aCO2/Ca-vO2 = venous–arterial CO2 to arterial–venous O2 content difference ratio, MAP = mean arterial blood pressure, CVP = central venous pressure, O2ER = oxygen extraction, renal lactate gradient = lactate kidney vein − lactate arterial, spleen lactate gradient = lactate spleen vein − lactate arterial, pO2 = oxygen partial pressure, total hepatic blood flow = hepatic arterial blood flow + portal vein blood flow, hepatic lactate uptake = hepatic lactate influx − hepatic lactate efflux, hepatosplanchnic lactate uptake = (arterial lactate − hepatic venous lactate) * total hepatic blood flow