Possible mechanism of late lumen enlargement after treatment for de novo coronary lesions with drug-coated balloon

• Published in: International journal of cardiology 2020-12, Vol.321, p.30-37
• Main Authors: Yamamoto, Tetsuya, Sawada, Takahiro, Uzu, Kenzo, Takaya, Tomofumi, Kawai, Hiroya, Yasaka, Yoshinori
• Format: Article
• Language: English
• Subjects: Angioplasty, Balloon, Coronary - adverse effects; Coronary Angiography; Coronary Artery Disease - diagnostic imaging; Coronary Artery Disease - therapy; Coronary Vessels - diagnostic imaging; Drug coated balloon; Humans; Intravascular ultrasound; Late lumen enlargement; Pharmaceutical Preparations; Treatment Outcome; Ultrasonography, Interventional
• ISSN: 0167-5273; 1874-1754
• DOI: 10.1016/j.ijcard.2020.07.028

Drug-coated balloon (DCB) treatment for de novo coronary artery disease has demonstrated late lumen enlargement (LLE) in mid-term follow-up and it was considered as clinical benefit; however, its mechanism and the predictive factor remains unclear. This study enrolled 46 consecutive patients (54 lesions) treated with DCB, using intravascular ultrasound (IVUS) at the index procedure and at the 9-month follow-up. We measured IVUS parameters at 1-mm intervals and calculated the mean volume of the external elastic membrane (EEM), lumen, and plaque. We calculated the dissection index (DI) defined as summation of the following points, 2: dissection over EEM, 1: intra-EEM dissection, 0: no dissection at every 1-mm interval, and divided by lesion length. IVUS showed that there was no flow limiting dissection just after DCB treatment, the mean EEM and lumen volume (LV) had significantly increased while mean plaque volume had significantly decreased at 9 months, and 74.1% lesions exhibited LLE. We divided the patients into three groups according to delta mean LV. Mean EEM volume significantly increased and mean plaque volume significantly decreased in the larger and smaller LLE groups, but not in the non-LLE group. The DI was higher in a descending order in the three groups. The multiple regression analysis demonstrated that the DI was the strongest predictor of the change in mean LV. LLE after DCB treatment may be caused by vessel enlargement and plaque regression. The non-flow limiting larger dissection just after DCB treatment may strongly associate with the intending LLE. •Late lumen enlargement (LLE) after DCB treatment contribute to good clinical result.•Significant vessel enlargement and plaque regression were mechanism of LLE.•Dissection without flow limitation may cause the intending LLE after DCB treatment.