OCT Technology: Differences between Biodegradable and Durable Polymers: Insights from the LEADERS Trial LEADERS OCT
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1 OCT Technology: Differences between Biodegradable and Durable Polymers: Insights from the LEADERS Trial LEADERS OCT Substudy Carlo Di Mario, MD Peter Barlis, MD Evelyn Regar, MD Peter Juni, MD Patrick Serruys, MD
2 LEADERS OCT Substudy Introduction What Have We Learnt From LEADERS? A drug eluting stent with abluminal biodegradable polymer eluting biolimus is as good (in fact marginally better) than the first in class, the Cypher Why are People Excited About It? Because they hope that a biodegradable polymer will be better in terms of long term safety
3 BioMatrix Flex Stent Platform Drug: Biolimus A g/ mm stent Drug carrier: Poly(Lactic Acid) PLA:BA9=50:50 Stent platform: -stainless steel (112 m) -corrugated ring, quadrature-link design for improved flexibility Cross-section sketch of Biolimus A9-eluting stent -asymmetric, abluminal coating
4 Definite Stent Thrombosis Biolimus Stent 857 Patients Sirolimus Stent 850 Patients P 0-30 days 1.6% 1.6% 0.98 >30 days 9 mo 0.2% 0.5% mo 12 mo 2.0% 2.0% mo-24 mo?? mo?? mo?? mo??
5 Limus Eluted From A Durable vs ERodable Stent Coating OCT Substudy PI: Carlo Di Mario, Peter Barlis, Evelyn Regar, Patrick Serruys Royal Brompton Hospital, London Thoraxcenter, Erasmus MC, Rotterdam Consecutive patients in the Angiographic Substudy (1:4 randomization to Angiographic Follow-Up at 9 months) were requested to perform an OCT examination during follow-up angiography Primary endpoint: Secondary endpoints: Strut Apposition at f-up Neointimal Thickness % CSA Neointimal Obstruction Presence neointimal coverage f-up
6 Baseline Clinical Characteristics Sirolimus n = 26 Biolimus n = 20 P Value Age (years) 65±10 66± Male (%) Hypertension (%) Diabetes Mellitus (%) Smoker (%) Dyslipidaemia (%) Family History (%) Prior MI (%) Prior PCI (%) Prior CABG (%) LVEF (%) 54.9± ± Primary PCI STEMI (%)
7 ALL (n=64) Sirolimus (n=35) Biolimus (n=29) P value Target vessel 0.15 Left main LAD Left circumflex RCA Bypass graft Reference VD (mm) Lesion length (mm) Baseline QCA MLD (mm) DS, %
8 QCA After Procedure MLD (mm) ALL (n=64) Cypher Select (n=35) BioMatrix (n=29) P value In-stent In-segment DS (%) In-stent In-segment Acute gain (mm) In-stent In-segment
9 ALL (n=64) Sirolimus (n=35) Biolimus (n=29) P value Reference VD (mm) MLD (mm) In-stent In-segment DS (%) In-stent In-segment Late loss QCA at F/U In-stent In-segment
10 9 Mo Follow-Up Results MACE (46 Pts, 100%) & QCA (65 Lesions, 98%) Major Adverse Events Sirolimus n = 26 Biolimus n = 20 P Value Q-Wave MI 0 0 Non-Q wave MI 2 1 TVR 2 0
11 A Typical LEADERS Case from Rotterdam 2 Biolimus Eluting Stents LEADERS OCT Substudy
12 Covered malapposed strut Uncovered struts Hyperplasia of neointima Well covered struts 2.36 mm², SA 3.39 mm ²
13 Thin Intimal Coverage of Stent Struts BioMatrix Stent 7 Months post Implantation
14 Incomplete Coverage of Stent Struts BioMatrix Cypher
15 Coverage of Overlapping Stents Baseline pre Cypher 2.25 x 23, 2.5 x 28, 3 x 33, 3x23 mm
16 Late Intimal Coverage Malapposed Cypher Stent Struts Uncovered Covered
17 Minimal Distance between mid-point Leading Edge Stent Strut and Intimal Contour If the intimal contour is shadowed behind strut, draw a line connecting adjacent visible intimal contours 230 m
18 Classification of Stent Strut Malapposition Apposed Malapposed Embedded Protruding Malapposed Cypher Select < 80 m m 160 m Taxus Liberte < 65 m m 130 m Endeavor/Resolute < 55 m m 110 m BioMatrix < 56 m m 112 m Embedded Protruding Malapposed
19 LEADERS OCT Substudy Neointimal & Stent Areas + Thickness Independent Core Laboratory (Cardialysis) with Analysts Blinded Single Stent To Randomisation
20 LEADERS OCT Substudy OCT Data Analysis Analysis of stented segment with computer-assisted contour detection at 450 μm intervals Lumen area Stent area Neointimal area Analysis of individual cross sections Strut apposition Strut coverage Tissue appearance Neointimal thickness Intraluminal tissue/thrombus
21 LEADERS OCT Substudy OCT Analysable Data struts in 64 lesions (triangles) in 46 patients belonging to the two groups were examined. Triangle base reflects the number of struts in each lesion. Randomized to Stent 0 Randomized to Stent 1 59 lesions lesions within Lesions in 46 ithin patients patients Struts Struts struts within in lesions
22 Multilevel structure of stent-related OCT data Struts and stents clustered in lesions Lesions clustered in patients Principle of data independence violated CANNOT USE CLASSIC STATS: t-test chi-square linear regression logistic regression Patient Lesion Stent Strut
23 Stent-related OCT data: Multilevel analysis WEIGHTED MULTILEVEL ANALYSIS IN WINBUGS - Two levels: - Patients Lesions - Includes random effects at the level of patients - Accounts for correlation of lesion characteristics within patients - Implicitly assigns analytical weights proportional to numbers of struts observed within each lesion
24 Percentage of Uncovered Struts Difference 1.4%, 95% CI 0.0 to 3.7%, p= Sirolimus Biolimus
25 Percentage of lesions with >10% uncovered struts Difference 11.2%, 95% CI -0.5 to 32.5%, p= Sirolimus 14 Biolimus
26 Percentage of lesions with >5% uncovered struts Difference 34.5%, 95% CI 10.4 to 62.7%, p= Sirolimus Biolimus
27 Percentage of lesions with any uncovered struts Difference 11.7%, 95% CI to 46.2%, 75.7p= Cypher Biomatrix
28 Lesions with Stent 0 Distribution of Uncovered Struts within Lesions Lesions with Stent 1 Sirolimus Biolimus
29 median neointimal thickness per lesion Neointimal Coverage per Lesion Sirolimus Stent 0 Stent Biolimus 1 p=0.13
30 struts Number of Struts LEADERS OCT Substudy Neointimal Thickness Distribution visualised by IVUS=27.65% Missed by IVUS=72.4% Neointimal Thickness Neointimal thickness
31 OCT Qualitative Analysis Tissue Appearance A B C Homogenous Strut is covered on luminal side with tissue, that is homogenous, dense and signal-rich Inhomogenous Strut is covered on luminal side with tissue, that is not homogenous but shows signal-rich and sharply Delineated, focal signal-poor areas Layered Strut is covered on luminal side with tissue, that shows a concentric, layered appearance with transition from signal-rich to signal poor tissue Courtesy of Dr E. Regar, Rotterdam, NL
32 Fourier-Domain OCT Imaging l sweep Reflections at different depths generate interference signals with different frequencies 1260 nm 1360 nm Fast tunable laser Fixed reference mirror Fast Fourier Transform (FFT) Amplitude Frequency (Depth)
33 LEADERS OCT Substudy Conclusions In a consecutive group of patients/lesions from the randomised LEADERS trial the biolimus eluting stent struts are more frequently apposed and have more frequently neointimal coverage visualised with OCT than sirolimus eluting stents The clinical relevance of these findings require further scrutiny Neointimal thickness in covered struts is similar in sirolimus and biolimus struts and below 100 μm (IVUS threshold) in the majority of cases (72.4%)
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