Table 3. Bupivacaine Concentrations in the Chest Tube Drainage 4 h after Surgery and Serum Concentrations 24 and 48 h after Surgery in the Three Treatment Groups

Values are mean ± SD.

* Control group versus  bupivacaine-0.5% group, P < 0.05.

† Bupivacaine, 0.25% group versus  bupivacaine-0.5% group, P < 0.05.