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Plaque modification of severely calcified coronary lesions by scoring balloon angioplasty using Lacrosse non-slip element: insights from an optical coherence tomography evaluation

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TLDR
The thickness and shape of calcifications were predictors of successful lesion modification after Lacrosse NSE angioplasty and receiver-operating characteristic curve analysis showed that calcification thickness < 565 μm was the best predictor of completely disrupted calcification.
Abstract
Percutaneous coronary intervention (PCI) for heavily calcified lesions is challenging because these lesions are resistant to balloon dilatation and stenting. Lacrosse non-slip element (NSE) may have the potential to dilate heavily calcified lesions. We aimed to investigate predictors of successful lesion modification using Lacrosse NSE angioplasty via optical coherence tomography (OCT)-guided PCI. We investigated 32 patients with severe target lesion calcification treated with OCT-guided PCI. Successful lesion modification was defined as the complete fracture of calcification after Lacrosse NSE angioplasty. Before PCI, 172 segments with calcification were identified. After pre-dilatation using Lacrosse NSE, successful lesion modification was achieved in 117 segments (68.0%). Calcification was significantly thinner in successfully disrupted segments than in non-disrupted segments (p < 0.001). Calcification angle tended to be larger in disrupted than in non-disrupted segments (p = 0.08). Convex types were less frequently observed in disrupted than in non-disrupted segments (p < 0.001). At minimal lumen area sites, 26 segments (81.3%) were successfully modified. Similar to the overall results, the disrupted group had significantly thinner calcification than the non-disrupted group (p < 0.001). The angle of the calcified plaque was similar between the 2 groups (p = 0.39). Convex-type calcifications were less frequently observed in the disrupted group than in the non-disrupted group (p = 0.05). Receiver-operating characteristic curve analysis showed that calcification thickness < 565 μm was the best predictor of completely disrupted calcification. The thickness and shape of calcifications were predictors of successful lesion modification after Lacrosse NSE angioplasty.

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様式第5 号(第 9条関係)
論文内容の要旨
報告番号
氏名
菅原裕
Plaque Modification of Severely Calcified Coronary Lesions by Scoring Balloon Angioplasty Using
Lacrosse Non-slip Elemen
t: Insights from an Optical Coherence Tomography Evaluation
(和訳)
冠動脈高度石灰化病変に対するスコアリングバルーンラクロス
Non -Slip Element を用い
た冠動脈形成術一光干渉断層法による有用性の評価
論文内容の要旨
背景
冠動脈インターベンョンにおいて、高度石灰化プラー を有する冠動脈病変拡張は時に困難を
伴う場合がある。高度石灰化病変をバルーンによる前拡張なしにステントを留置するとステント拡
張不全やステント内血栓症の原因となる スコアリングバルーンであるラクロス
Non-Slip
Elemenet (NSE)
は高度石灰化病変を拡張するのに適しているといわれている光干渉断層法 (OCT)
冠動脈プラークの組織性状を明瞭に評価出来る。今回、我々はラクロス
NSE で有効な前拡張可能な
石灰化病変の特徴を明らかにするために、
OCT を用いて検討を行った。
方法
ラクロス
NSE を用いて冠動脈形成術を施行した、高度石灰化病変 32 例に対しに対し OCT を行い、
術前後の病変を評価した。対象冠動脈プラークのうち、内腔断面積が最も小さ 部位で、石灰化プ
ラークが完全に離断しているものを拡張成功と定義した。高度石灰化プラークを有する
172 断面を
評価対象とした
結果
ラクロス NSE による拡張で全体の 68 出にあたる 117 断面で拡張成功がみられた拡張不成功群と比
較して拡張成功群は石灰化プラークの厚みが有意に薄かった
(p 0.001) 。石灰化プラークの角度は
拡張成功群の方が大きい傾向があったが有意差はみられなかった
(p=0.08) 拡張不成功群は拡張成
功群と比較して血管内腔に向かつて凸型の石灰化が多く みら れた
(p 0.001) 対象プラークの 内腔
断面積が最も小さい部位部分において
26 病変 (8 1. 3略)がラクロス NSE での拡張が得られた 内腔が
最も小さい部位でも拡張成功群と不成功群を比較すると、拡張成功群は石灰化の厚みが薄かった
(p O. 001) 。石灰化の角度は拡張成功群と不成功群で、差はなかった (p=O. 39) 。内向きに凸の石灰化
は拡張不成功群で有意に多くみられた
(p=O. 05) 0 ROC 曲線解析によれば、ラクロス NSE による冠動
脈拡張が得られるカ トオフ値は石灰化の厚さが 56511m 以下であった。また,石灰化の角度が
270 。以上の病変に限定すると、そのカ トオフ値は石灰化厚さが 53511m 以下で、あった。
結論
冠動脈プラークの石灰化の厚みと石灰化の形態がラクロス
NSE による冠動脈拡張成功の予測に有用
であった。石灰化の厚みが
56511m 以下で、血管内腔に向かつて凸ではない形態の石灰化であればラ
クロス
NSE による冠動脈拡張成功が得られる可能性が高い
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References
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Cutting balloon: A novel approach to percutaneous angioplasty☆

TL;DR: The aims of the study were to determine the immediate morphology of incisions made with the cutting balloon, determine the healing response to the endovascular incisions, and compare angiographie results obtained with standard and cutting balloons.
Journal ArticleDOI

Impact of target lesion coronary calcification on stent expansion.

TL;DR: The extent of target lesion calcification as assessed by OCT may be an important determinant of the expansion of 2nd-generation DES.
Journal ArticleDOI

Treatment of calcified coronary lesions with Palmaz-Schatz stents An intravascular ultrasound study

TL;DR: Implantation of stents in calcified lesions results in less optimal stent expansion, especially in lesions with thick, eccentric calcific plaque layers, and use of adjunctive rotational atherectomy before stent placement may improve the procedural result.
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