Format

Send to

Choose Destination
Int J Cardiol. 2019 Oct 1;292:95-97. doi: 10.1016/j.ijcard.2019.05.041. Epub 2019 May 18.

Optimal balloon positioning for the proximal optimization technique? An experimental bench study.

Author information

1
Department of Interventional Cardiology, Cardiovascular Hospital and INSERM Unit 1060 CARMEN, Lyon, France; Stanford University Medical Center and Palo Alto VA Health Care Systems, Stanford, CA, USA. Electronic address: francois.derimay@chu-lyon.fr.
2
Department of Interventional Cardiology, Cardiovascular Hospital and INSERM Unit 1060 CARMEN, Lyon, France.
3
Stanford University Medical Center and Palo Alto VA Health Care Systems, Stanford, CA, USA.
4
CHU Nantes, PHU4 OTONN, Nantes, F-44093, France.

Abstract

AIMS:

The proximal optimization technique (POT) in coronary bifurcation stenting improves apposition and side-branch obstruction. The POT balloon should be positioned with the distal radio-opaque marker at the carina cut plane. However, the real impact of positioning remains unknown.

METHODS AND RESULTS:

Synergy™ stents (Boston Scientific, USA) were implanted on left-main fractal bench models. Initial POT was performed in 3 positions according to distal shoulder position (loss of balloon parallelism) relative to the carina cut plane (n = 5/group): i) "proximal", 1 mm before carina; ii) "medium", just at carina; iii) "distal", 1 mm after carina. Results were quantified on 2D- and 3D-OCT. Compared to implantation, initial POT improved malapposition in all positions ("proximal": 61.5 ± 1.4% vs. 5.1 ± 2.7%; "medium": 60.2 ± 2.4% vs. 1.3 ± 0.6%; "distal": 60.5 ± 2.9% vs. 1.1 ± 1.8%, p < 0.05). However, residual malapposition was greater in "proximal" position (p < 0.05). "Proximal", unlike "medium" or "distal" POT, also failed to improve side-branch obstruction. Conversely, "distal" POT significantly overstretched the main-branch ostium, with stent/artery ratio 1.22 ± 0.04 vs. 1.11 ± 0.07 for "medium" POT (p < 0.05).

CONCLUSION:

Shoulder positioning is essential to optimize the mechanical benefit of POT without main-branch overstretch (too distal position). Experimentally, the best position is just at the carina cut plane ("medium").

Supplemental Content

Full text links

Icon for Elsevier Science
Loading ...
Support Center