[Efficacy of drug coated balloon versus conventional balloon in the treatment of coronary de novo bifurcation lesions: a meta-analysis].

To systematically evaluate the efficacy of drug coated balloon (DCB) versus conventional balloon in the treatment of coronary de novo bifurcation lesions. The databases of PubMed, Embase, Cochrane Library, Web of science, CNKI (China National Knowledge Infrastructure), Wanfang database, VIP, China Biology Medicine disc, Chinese clinical trial registry, American clinical trial registry and cardiovascular related websites until September 2020 were retrieved for collecting the randomized controlled trials (RCT) comparing DCB versus conventional balloon in the treatment of coronary de novo bifurcation lesions. The risk of bias of included studies was assessed using the Cochrane risk assessment tool. The meta-analysis was performed by using Revman 5.3 and Stata 14.0 software. Seven RCTs with a total of 613 patients were included in this meta-analysis. Among the included studies, 4 articles reached the low risk of bias, and the other 3 articles reached the medium risk of bias. The results of meta-analysis showed that there was no significant difference in the major adverse cardiac events (=0.65, 95% 0.39-1.08, =0.10), myocardial infarction (=0.68, 95% 0.25-1.80, =0.43), target lesion revascularization (=0.94, 95% 0.53-1.67, =0.83) between DCB group and conventional balloon group. Late lumen loss of side branch was less in the DCB group than that in the conventional balloon group (=-0.25, 95% -0.41--0.09, <0.01) and the risk of side branch restenosis was also lower in the DCB group than that in the conventional balloon group (=0.47, 95% 0.22-0.98, <0.05). However, subgroup analysis showed that the conclusions of domestic studies and foreign studies on late lumen loss and side branch restenosis were inconsistent. The meta-analysis based on domestic literature showed that the risk of side branch restenosis after DCB treatment was lower compared with conventional balloon group (=0.29, 95% 0.15-0.57, <0.05), while this parameter derived from foreign literatures remained unchanged between two groups (=0.53). The meta-analysis results of domestic literature showed that late lumen loss in DCB group was less than that in conventional balloon group (=-0.32, 95% -0.51--0.13, <0.05), but this phenomenon was not observed in foreign literatures (=0.30). The use of DCB in the treatment of coronary de novo bifurcation lesions has the potential to reduce the rate of restenosis and late lumen loss of side branch compared with conventional balloon group. However, due to the limitation on quantity, quality and results of published studies, more high-quality and large scale RCTs are still needed to confirm these findings.