The relationship between chest tube position in the thoracic cavity and treatment failure in patients with pleural infection: a retrospective cohort study

Abstract

Background: Pleural infection is an infection of the pleural space that is usually treated with antibiotics and source control. Chest tube insertion is the most popular and widely used drainage technique. We typically attempt to place the tube at the bottom of the thoracic cavity to consider the effects of gravity; however, the effectiveness of this practice is not well-defined. Therefore, we aimed to examine whether the position of the tip of the thoracic tube affects treatment failure in patients with pleural infection. Methods: In this retrospective observational study, patients with pleural infection who underwent thoracic tube insertion were divided into two groups: those with the tip of the tube positioned below the 10th thoracic vertebra at the level of the diaphragm (lower position group) and those with the tip placed above the 9th thoracic vertebra (upper position group). We compared whether the position of the tube tip affected treatment failure. Stabilized inverse probability treatment weights (SIPTW) were used to balance the baseline characteristics between the groups. Treatment failure showed a composite outcome of hospital death, referral to surgeons for surgery, and additional chest tube insertion. Results: Among the 87 patients, 41 and 46 patients were in the lower and upper groups, respectively. No significant difference was observed in the composite outcomes between the groups (46.3% vs. 54.3%, P = 0.596). There was also no significant difference in the composite outcome between both groups after adjusting for SIPTW (52.3% vs. 68.8%, P = 0.286). Conclusions: There were no significant differences in the treatment failure in this study addressing pleural infection treatment, in which the drain tip position was stratified by the 9th and 10th thoracic vertebrae. The position of the tip of the thoracic tube may not be important for pleural infection treatment providing that it is in the thoracic cavity. Trial registration The participants were registered retrospectively.