(Circulation. 1997;95:363-370.)
© 1997 American Heart Association, Inc.
Articles |
Serial Follow-up After Optimized Ultrasound-Guided Deployment of Palmaz-Schatz Stents
In-Stent Neointimal Proliferation Without Significant Reference Segment Response
the Department of Medicine, Division of Cardiology, Klinikum Innenstadt, University of Munich, Germany.
Correspondence to Priv-Doz Dr med Harald Mudra, Medizinische Klinik, Klinikum Innenstadt, Ziemssenstrasse 1, D-80336 Muenchen, Germany.
Background The effects of ultrasound-guided high-pressure stenting on late stent and reference segment dimensions are unknown. In this study, we report about angiographic and ultrasound measurements to assess the amount and distribution of neointimal ingrowth within the stent and the changes of plaque burden and dimensions within the reference segments.
Methods and Results Sixty-eight consecutive patients with 72 lesions received single or multiple Palmaz-Schatz coronary stents with a standardized protocol for stent optimization under ultrasound guidance. The residual angiographic diameter stenosis was 3±12% (reference diameter, 3.16±0.61 mm). At follow-up 4.8±2.5 months later, angiography revealed a diameter stenosis of 27±21% with a restenosis rate of 15.3% (confidence interval: 7.8% to 25.6%). Lumen renarrowing within the stent was exclusively due to neointimal ingrowth; no stent compression was observed. The neointima covered 20±20% of the stent area and was more pronounced in the midportion of the stent. Volumetric assessment performed in 26 patients resulted in 13±14% or 65±28% of the stent volume occupied by neointimal ingrowth in patients without or with restenosis, respectively. Vessel remodeling had an impact on lumen dimensions only at reference sites but not within the stent. Plaque burden of 46±11% and 48±11% at the proximal and distal reference sites, respectively, did not show a relevant progression during the follow-up.
Conclusions Serial ultrasound analyses did not show any evidence of stent compression or relevant vessel remodeling. Restenosis was solely due to neointimal ingrowth. Despite a considerable plaque burden within the reference segments, there was no relevant progression of the disease adjacent to the stent.
Key Words: ultrasonics • stents • angioplasty • angiography • restenosis
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