Results
pain
126 patients were assessed for eligibility. 7 patients were excluded from final analysis because of converting to thoracotomy. Finally, 119 patients completed the study (Fig. AS indicated in Fig. The duration of insertion of chest tube in ICBN group was shorter than that in control group, and the difference was statistically significant (4.69 ± 2.14 vs. 5.67 ± 2.86, 
Schematic illustration of the study population
Demographic and perioperative characteristicsSex  F  MAge(yr)Duration of surgery(min)Type of VATS  Lobectomy  SegmentectomyHeight(cm)Body Mass Index(kg/m166.46 ± 8.4823.67 ± 83.26164.64 ± 7.9923.22 ± 4.140.1380.7491.2040.661ASA class  I  II25362335
Visual analog scale (VAS) pain scores with respect to time048162448721682.26 ± 0.082.21 ± 0.08
Comparison of visual analog scale (VAS) pain scores with respect to time. * 
Visual analog scale (VAS) pain scores with respect to time
Surgical outcomeslength of postoperative stay(d)duration of insertion of chest tube(d)incidence of nausea and vomiting (%)postoperative pulmonary infection (%)2(3.27%)3(4.91%)5(8.62%)6(10.34%)0.7190.5960.3960.440
Rescue analgesia requirement0-4 h (%)0-8 h (%)0-24 h (%)0-48 h (%)6(9.83%)6(9.83%)15(25.86%)18(31.03%)5.2548.2980.0220.004The rescue analgesia requirement in the two groups was shown in Table 