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Comparison of intra-operative central venous pressure (CVP) measurements between thoracic epidural analgesia (TEA) and intrathecal morphine and fentanyl patient-controlled analgesia (ITM+fPCA). CVP measurements compared between types of central neuraxial block (CNB) at different time points using the Mann–Whitney U-test, *P < 0.001. Error bars indicate 95% confidence intervals
