RESUMEN
OBJECTIVE: Pleural tubes after coronary artery bypass graft (CABG) surgery usually cause pain resulting interalia in an impact of postoperative breathing. Therefore, the influence of intrapleural lidocaine application through special double-lumen chest tubes with respect to pain relief and lung function was investigated and compared with placebo. METHODS: In this study, 40 patients who underwent CABG got intrapleural injection either with 2% lidocaine (n = 20) or placebo (0.9% saline solution) (n = 20) on the first 2 days after surgery. Pain was measured by pain intensity numeric rating scale (NRS) (0 = no pain; 10 = the most intense pain) and lung function by portable spirometer. RESULTS: On the first postoperative day (POD1), mean pain reduction was NRS 1.9 for the lidocaine group with an improvement of the forced expiratory volume in 1 second (FEV1) of 0.51 L. Similar results were shown on the second postoperative day (POD2) with a decreased pain level of mean NRS 1.65 and an FEV1 improvement of 0.26 L. In comparison, results of the placebo group showed no significant pain reduction, neither on the POD1 (NRS 0.35; p = 0.429) nor on the POD2 (NRS 0.55; p = 0.159). Also, there was no significant influence of FEV1 after placebo on the POD1 (FEV1 = 0.048 L; p = 0.70) or on the POD2 (FEV1 = 0.0135 L; p = 0.925). CONCLUSION: Intrapleural application of lidocaine is a safe and feasible method to reduce drainage-related pain and improving lung function after CABG.