期刊
EUROINTERVENTION
卷 14, 期 2, 页码 166-173出版社
EUROPA EDITION
DOI: 10.4244/EIJ-D-17-00719
关键词
aortic stenosis; fractional flow reserve; transcatheter aortic valve implantation
资金
- Swiss National Science Foundation for research [3200B_163256/1]
- Swiss Heart Foundation
Aims:In this study we aimed to test the hypothesis that left ventricular (LV) afterload reduction in severe aortic valve stenosis (AS) by transcatheter aortic valve implantation (TAVI) acutely improves coronary haemodynamics. Methods and results: This was a prospective, pathophysiologic study in 40 patients with severe AS undergoing TAVI. Endpoints were determined invasively immediately before and after TAVI without altering coronary stenotic lesions if present. Myocardial hyperaemia was induced by intravenous adenosine. The primary study endpoints were coronary flow reserve (thermodilution-derived CFR), and fractional flow reserve (FFR). The secondary study endpoint was coronary collateral flow index (CFI) as obtained during a one-minute coronary balloon occlusion. CFR was 1.9 +/- 0.9 before TAVI and 2.0 +/- 1.0 after TAVI (p=0.72). FFR was 0.90 +/- 0.08 before TAVI and 0.93 +/- 0.08 after TAVI (p=0.0021). The TAVI-induced increase in FFR was related to a significant decrease in hyperaemic mean aortic pressure from 71 +/- 16 mmHg before TAVI to 67 +/- 15 mmHg after TAVI (p=0.0099). Hyperaemic CFI increased from 0.127 +/- 0.083 before to 0.146 +/- 0.090 after TAVI (p=0.0508). Conclusions: CFR appears not to be acutely affected by LV afterload reduction among patients with severe AS in response to TAVI. However, it acutely improves FFR; this occurs via lowering of mean aortic pressure. Hyperaemic coronary collateral flow index tends to augment in response to TAVI.
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