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Erschienen in: Herz 6/2015

Open Access 01.09.2015 | Main Topic

OCT demonstrating neoatherosclerosis as part of the continuous process of coronary artery disease

verfasst von: B.-C. Zhang, A. Karanasos, E. Regar, MD, PhD

Erschienen in: Herz | Ausgabe 6/2015

Abstract

Although the advent of drug-eluting stents has reduced the rates of target vessel revascularization, there are observations of ongoing stent failure occurring very late after stent implantation and presenting as very late restenosis or as very late stent thrombosis. The de novo development of atherosclerosis within the neointimal region, called neoatherosclerosis, has been identified as one of the pathomechanisms of these observed late stent failures. The mechanisms of neoatherosclerosis development and its association with stent failure are currently the subject of intensive research. Optical coherence tomography (OCT) is an invasive imaging modality that allows us to visualize the micromorphology of coronary arteries with near-histological resolution, thus providing detailed assessment of the morphological characteristics of the neointima after stent implantation, including neoatherosclerosis. Several OCT studies have tried to provide in vivo insights in the mechanisms of neoatherosclerosis development and its association with late stent failure. This review summarizes the current insights into neoatherosclerosis obtained with OCT and discusses the association of neoatherosclerosis with late stent failure.
Drug-eluting stents (DES) have reduced the rates of target vessel revascularization and comprise the mainstay of treatment in percutaneous coronary intervention. However, despite the excellent short- and mid-term results with the current DES generation, ongoing stent failure with both bare metal stents (BMS) and DES is a frequent finding very late after stent implantation [13]. Very late stent failure clinically manifests as very late restenosis or stent thrombosis. Although the pathogenesis of (very) late stent failure appears to be multifactorial [4, 5], one of the major mechanisms that have been implicated is the de novo development of atherosclerosis within the neointimal region, called neoatherosclerosis [6, 7]. Observations of neoatherosclerosis have been documented both in ex vivo pathological observations and in vivo by intravascular imaging.
Among several imaging modalities that have been used to identify neoatherosclerosis [811], optical coherence tomography (OCT) can provide the most comprehensive assessment of the neointimal tissue. OCT allows for the visualization of the micromorphology of coronary arteries with near-histological resolution, differentiating between individual plaque components and providing important quantitative plaque information as the thickness of the fibrous plaque [12, 13]. Thus, by OCT it is possible to assess distinct morphological characteristics of neoatherosclerosis, such as macrophage infiltration, lipid accumulation, in-stent calcification, or neointimal rupture. Consequently, in vivo OCT studies have focused on studying in-stent neoatherosclerosis and its association with late stent failure. This review summarizes the current insights into neoatherosclerosis obtained with OCT and discusses the implications of neoatherosclerosis on long-term outcome after stent implantation.

Definition and OCT imaging evidence of in-stent neoatherosclerosis

Neoatherosclerosis refers to an atherosclerotic change in neointimal tissue, first described in pathologic specimens of BMS, and more recently in pathologic specimens of DES as well [6, 7]. Although observations of neoatherosclerosis had been sporadically documented from the early application of OCT [14, 15], the tissue properties of the observed neointimal tissue patterns were unknown. Pathological studies were the first to provide more comprehensive insights regarding the histological composition of this entity. These studies defined neoatherosclerosis as the presence of clusters of lipid-laden foamy macrophages with or without necrotic core formation and/or calcification within the neointimal tissue of stented segments [6]. The presence of morphological components of native atherosclerosis within the neointimal tissue implies that these features can be identified by OCT, which has a high accuracy for detection of these characteristics in native atherosclerotic plaques. This hypothesis has been corroborated by a pathologic study of ex vivo stented coronary arteries, imaged by OCT, which showed that the OCT appearance of these characteristics is similar to that in native atherosclerosis [16]. Components of neoatherosclerosis that can be visualized by OCT include macrophage infiltration, necrotic core, in-stent calcifications, and neoatherosclerotic plaque rupture [17]. An in-stent necrotic core visualized by OCT is defined as the presence of signal-poor, highly attenuating regions with poorly delineated borders within the neointima, while in-stent calcifications are defined as well-delineated, signal-poor regions with sharp borders [16]. In accordance with native atherosclerosis, macrophages on OCT appear as a thin signal-bright layer causing high attenuation, while neointimal plaque rupture appears as a discontinuation in the luminal surface with formation of a cavity burrowing into the neointima [16]. Representative OCT images of in-stent neoatherosclerosis are shown in Fig. 1.
At this point it is important to emphasize the difference of neoatherosclerosis with the previously reported heterogeneous and layered patterns of coverage [18]. These patterns are respectively defined as neointimal tissue with focally changing optical properties and varying backscattering patterns, and as neointimal tissue with concentric layers having different optical properties (an adluminal high scattering layer and an abluminal low scattering layer). Such patterns are often encountered in the context of in-stent restenosis, and although the pathological substrate is not well characterized, histological findings from atherectomy specimens, autopsy, and animal experiments include organized thrombus, fibrin, and myxomatous extracellular matrix with sporadic evidence of inflammation [16, 1921]. The association of these patterns with neoatherosclerosis is yet unknown, however there is evidence that these patterns similar to the homogeneous pattern may subsequently be replaced by neoatherosclerotic tissue [22, 23]. Representative OCT images of different neointimal coverage patterns are shown in Fig. 2.
Although OCT can discern the distinct morphological characteristics of neoatherosclerosis, caution should be applied to image interpretation. This is because macrophage infiltration can sometimes appear as in-stent necrotic core, and vice versa [24]. Also, the distinction of a layered pattern of coverage with in-stent necrotic core can also be challenging sometimes, although the low attenuation observed in the case of the layered pattern can be used to discriminate between these two entities [16]. Finally, with OCT it is not possible to distinguish between true adluminal atherosclerosis from the progression of an abluminal underlying necrotic core into the neointima. Nevertheless, the latter mechanism appears to be less prevalent [25], while it is unclear what the clinical significance of such a discrimination would be.

In vivo prevalence of neoatherosclerosis in BMS and DES with OCT

Several studies have tried to investigate the prevalence of neoatherosclerosis late after BMS or DES implantation using OCT (Table 1). The reported prevalence varies highly between the studies. As these studies differ significantly in stent type, in the interval between stent implantation and follow-up, and in the clinical presentation, this difference in prevalence appears to reflect differences in the composition of the studied population. The first reports of in-stent neoatherosclerosis report a prevalence of 67 % in patients with BMS implantation beyond 5 years [15]. Subsequent studies have shown lower prevalence ranging between 30 and 50 % in long-term follow-up of asymptomatic patients with BMS [2628]; however, this incidence could be as high as 100 % in BMS restenosis more than 10 years since implantation [29]. With regard to neoatherosclerosis within DES, a prevalence of more than 50 % has been reported in a very late follow-up [27, 28], which can be even higher in stents with failure [14]. These rates tend to generally be in accordance with rates reported by pathological studies, which show a prevalence of 13–65 % depending on stent type and stent age [25].
Table 1
Reported prevalence of neoatherosclerosis assessed by OCT in late stent follow-up studies
Study
Indication (n)
Stent type (n)
Follow-up duration
Prevalence (%)
Takano et al. [15]
Follow-up (21)
BMS (21)
≥ 5 years
67
Kitabata et al. [27]
Follow-up (36)
1st and 2nd DES (19)
BMS (17)
60 months
126 months
59
42
Kim et al. [22]
Follow-up (76)
1st and 2nd DES (76)
9 months
2 years
15
28
Kozuki et al. [23]
Follow-up (62)
1st DES (62)
3–12 months
36–80 months
3
23
Yonetsu et al. [30]
Follow-up (138)
1st and 2nd DES (82)
BMS (56)
 9 months
9–48 months
≥ 48 months
 9 months
9–48 months
≥ 48 months
37
63
75
8
28
77
Kuramitsu et al. [34]
Follow-up (33)
2nd DES (12)
1st DES (11)
BMS (10)
5 years
2 (frames)
10 (frames)
2 (frames)
Kitabata et al. [41]
Follow-up (46)
BMS (46)
≥ 4 years
47
Tian et al. [36]
Follow-up (109)
DES (109)
1 year
13.8
Hou et al. [26]
Follow-up (60)
BMS (60)
7 ± 1 years
33
Kang et al. [9]
Restenosis (50)
1st and 2nd DES (50)
32 (9–52) months
90
Kang et al. [29]
Restenosis (22)
BMS (22)
132 ± 31 months
100
Ino et al. [38]
Restenosis (48)
1st DES (48)
8 ± 1 months
34 ± 14 months
27
83
Ali et al. [8]
Restenosis (65)
1st and 2nd DES (51)
BMS (14)
33 (16–60) months
36 (15–113) months
68
36
Habara et al. [45]
Restenosis (86)
1st DES (86)
 1 year
1–3 years
 3 years
2
14
35
Lee et al. [33]
Restenosis (212)
1st DES (111)
2nd DES (101)
55 months
12 months
46
11
Ko et al. [54]
Stent thrombosis (18)
1st and 2nd DES (18)
42 ± 21 months
22
Amabile et al. [50]
Stent thrombosis (20)
1st DES (4) and BMS(16)
8 (1–18) years
50
Amioka et al. [51]
Stent thrombosis (23)
1st DES (13)
BMS (10)
1,750 ± 770 days
3,224 ± 1,380 days
46
50
Kang et al. [52]
Stent thrombosis (33)
1st DES (27)
BMS (6)
Median: 62 months
Median: 110 months
56
100
Alfonso et al. [67]
Stent thrombosis (15)
BMS(8) and DES (7)
Median: 347 days
27
Karanasos et al. [49]
Follow-up (22)
Restenosis (13)
Thrombosis (39)
BMS (13)/1st and 2nd DES (61)
≥ 18 months
Median: 63 months
32
85
67
BMS bare metal stents, 1st DES first-generation drug-eluting stents, 2nd DES second-generation drug-eluting stents, OCT optical coherence tomography.

Major factors associated with in-stent neoatherosclerosis

Stent type and age

Pathological studies were the first to indicate a potential association of stent type and stent age with the prevalence of neoatherosclerosis [6]. DES appear to have a higher prevalence of neoatherosclerosis compared with BMS. Moreover, irrespective of stent type, the interval from implantation appears to be strongly associated with neoatherosclerosis development, an interval which is much lower than the interval required for development of native atherosclerotic plaques [25]. Nakazawa et al. [6] first demonstrated an increased prevalence of neoatherosclerosis in autopsy specimens of first-generation DES compared with BMS despite a shorter interval from implantation. Importantly, in both groups, the prevalence of neoatherosclerosis increased with the interval since implantation [6]. In vivo OCT studies have been in line with pathological studies showing an increased prevalence of neoatherosclerosis in DES at a follow-up of up to 4 years, although at a very long-term follow-up the prevalence is similarly high for both stent types [30]. Furthermore, serial imaging observations in first- and second-generation DES demonstrate that neointimas with a homogeneous or heterogeneous pattern of coverage might develop neoatherosclerosis over time with the prevalence of neoatherosclerosis increasing from 15 % at 9 months to 28 % at 24 months since implantation [22]. This was further corroborated by another serial imaging study in first-generation DES where the incidence of neoatherosclerosis increased from 3 % at mid-phase observations (3–12 months after stent implantation) to 23 % at late-phase observations [23].
Although DES in general appear to have a higher prevalence of neoatherosclerosis than BMS, it is not clear whether the prevalence of neoatherosclerosis differs between first- and second-generation DES. Second-generation DES have improved biocompatibility due to thinner struts and more biocompatible or bioabsorbable polymers, which translates to lower vascular toxicity and hypersensitivity reactions [31, 32]. However, a human autopsy study did not demonstrate any significant difference in the prevalence of neoatherosclerosis between a second-generation DES, cobalt-chromium everolimus-eluting stent (CoCr-EES), and first-generation paclitaxel-eluting (PES) or sirolimus-eluting stent (SES): CoCr-EES = 29 %; SES = 35 %; PES = 19 % [32]. Conversely, an in vivo OCT study in 212 DES-treated patients with > 50 % stenosis (101 patients had a first-generation and 111 patients had a second-generation DES) demonstrated a significantly lower prevalence of neoatherosclerosis in the second-generation DES group (10.8 vs. 45.5 %, p < 0.001); however, this difference was not significant after adjusting for time since implantation [33]. Similar findings were observed with OCT in a comparison of the coronary arterial response in biodegradable polymer biolimus-eluting stents (BES) versus durable polymer SES and BMS at the 5-year follow-up. The number of cross sections with neoatherosclerosis within BES was similar to BMS (BES = 2.26 % vs. BMS = 2.23 %, p = 0.98) and tended to be lower than SES (BES = 2.26 % vs. SES = 9.90 %, p = 0.07) [34].
The reasons why the temporal course of atherosclerosis within stents is accelerated are not well understood; however, dysfunction of endothelial cells, which are barriers that prevent lipid infiltration and migration of inflammatory cells, has been considered to be the main mechanism. This mechanism can also explain the increased prevalence of neoatherosclerosis observed in DES, where local drug delivery inhibits neointimal hyperplasia, causing delayed coverage and dysfunction of endothelial cells [35].

Clinical factors

In addition to the stent type and age, several patient characteristics have been associated with neoatherosclerosis. Two registries of late stent follow-up have both identified chronic kidney disease as a factor independently associated with neoatherosclerosis [28, 33]. Other identified factors included low-density lipoprotein cholesterol > 70 mg/dl [33], current smoking, and lack of treatment with angiotensin-converting enzyme inhibitors or angiotensin II receptor blockers [28]. In another study, the presence of diabetes mellitus was associated with a higher incidence of neoatherosclerosis at a late DES follow-up (18.3 vs. 5.5 %, p = 0.03) [36]. Further subgroup analysis showed that elevated glycated hemoglobin (HbA1c) levels (> 7 %) in patients with diabetes mellitus were associated with a higher incidence of neoatherosclerosis (28 vs. 7 %, p = 0.048).

Plaque and stent characteristics

Plaque characteristics have also been implicated in the neoatherosclerotic process. Microvessels play a key role in advanced atherosclerosis, which is closely associated with plaque hemorrhage and plaque rupture [37], while previous investigations have demonstrated a higher incidence of microvessels in late in-stent restenotic tissue, suggesting that neovessels might be a trigger for in-stent neoatherosclerosis [38, 39]. Moreover, a spatial correspondence of neoatherosclerosis and microvessels was identified at a follow-up OCT examination of BMS and DES [40], supporting the hypothesis of microvessel involvement in neoatherosclerosis development. In the same study, neoatherosclerosis was more frequently identified in the proximal and distal stent sections, also associated with the morphology of the adjacent vessel segment. Specifically, the presence of lipid plaque in the adjacent stent edges was associated with the presence of neoatherosclerosis at the stent edges, implying that progression of native disease might also contribute to neoatherosclerosis. Apart from plaque characteristics, stent characteristics such as strut thickness seem to play a role even among the same stent type. In a study assessing the prevalence of neoatherosclerosis in BMS at a long-term follow-up (≥ 4 years after implantation), thick-strut stents (≥ 100 μm) had a higher prevalence of neoatherosclerosis compared with thin-strut stents (70 vs. 32 %, p = 0.02) [41].

Neoatherosclerosis and in-stent restenosis

Although early in-stent restenosis mainly results from aggressive neointimal proliferation [42], recent data also suggest that neoatherosclerosis may play an important pathophysiological role, especially in late restenosis. Pathological studies have demonstrated that neoatherosclerosis represents a common substrate in patients with late stent failure [43], while in vivo OCT studies have further elucidated the role of neoatherosclerosis in the development of late stent failure (Fig. 3). The presence of neoatherosclerosis has been associated with a higher degree of neointimal hyperplasia, independent from stent type and time since implantation [44]. Although during the early phases after DES implantation, homogeneous or heterogeneous patterns of coverage are the predominant pathology in in-stent restenosis, in later follow-up intervals restenosis is often associated with the presence of neoatherosclerosis [38, 45]. A study focusing on 50 patients with DES restenosis at a median follow-up of 32 months since implantation showed a prevalence of neoatherosclerosis of 52 % [9]. Also, in lesions with very late BMS restenosis beyond 10 years since implantation, neoatherosclerosis was detected in 100 % of the stents with a high frequency of neointimal rupture and neointimal thrombi [29]. However, a comparison of restenotic lesions of DES and BMS showed that neoatherosclerosis occurs earlier in DES compared with BMS and develops more diffusely along stented vessels with thinner cap and greater total lipid core [8]. Whether the contribution of neoatherosclerosis in restenosis of second-generation DES is similar to that of first-generation DES is not well established; however, observations of restenosis due to neoatherosclerosis have also been reported for second-generation DES [33].

Neoatherosclerosis and stent thrombosis

Neoatherosclerosis also appears to contribute to the development of (very) late stent thrombosis (Fig. 4). Initial pathological studies demonstrated a role for the underlying plaque in BMS thrombosis, while subsequent studies in DES incriminated an impaired healing response with high rates of uncovered struts and vascular toxicity-associated malapposition as the main pathogenetic factor [46, 47]. Nevertheless, more recent pathological and intracoronary imaging data support the hypothesis that neoatherosclerosis is an active causal mechanism in a high percentage of cases with late stent thrombosis [32, 48, 49]. Autopsy studies have shown that thrombosis might develop on the grounds of neointimal plaque rupture [32], while thrombus aspirate samples from patients with very late BMS thrombosis demonstrate the presence of atherosclerotic plaque components such as foamy macrophages and cholesterol crystals within the aspirates [48]. Simultaneously, a number of studies have examined the OCT findings in patients with late and very late stent thrombosis, in an attempt to identify the pathomechanisms [5054]. Despite minor discrepancies in the exact prevalence of neoatherosclerosis and the relative contribution of neointimal plaque rupture in each study, these studies collectively demonstrate a very high prevalence of plaque rupture as a pathomechanism for very late BMS thrombosis [55], and an almost equal contribution for neointimal plaque rupture and impaired healing in (very) late DES thrombosis [50, 52, 53]. Compared to an impaired healing response, neointimal rupture is a mechanism occurring mainly at longer intervals since stent implantation [50, 56], in neointimal regions with high necrotic core content and thin fibrous cap, similarly to what is observed in native atherosclerosis, but also with a very high incidence of macrophage infiltration [49].
Evidence also suggests that the clinical presentation of late stent failure is not exclusively affected by the presence of neoatherosclerosis but also by the morphological characteristics. In patients with in-stent restenosis, a higher incidence of OCT-defined thin-cap fibroatheroma, intimal rupture, and thrombi was identified in patients presenting with unstable angina compared with patients with stable symptoms [9]. Our group investigated the differences in the prevalence of neoatherosclerosis with regard to the clinical presentation [49]. Both stent restenosis and stent thrombosis had a higher prevalence of neoatherosclerosis compared with the asymptomatic group (stent thrombosis: 67 % vs. restenosis: 85 % vs. asymptomatic: 32 %; p < 0.001). However, the prevalence of neointimal rupture was higher in the stent thrombosis group (stent thrombosis: 41 % vs. restenosis: 15 % vs. asymptomatic: 5 %; p < 0.001) (Fig. 5a). This finding underscores the contribution of neoatherosclerosis development in the pathogenesis of late stent failure, while it indicates that neointimal rupture is mainly associated with acute presentation, although not infrequently encountered in stable or asymptomatic in-stent lesions.
Overall, intravascular imaging has changed the understanding of the pathogenesis of late restenosis and thrombosis by disclosing that neoatherosclerosis is a common pathomechanism in both entities (Fig. 5b). Stent restenosis had traditionally been considered a rather benign entity associated with stable symptoms, while stent thrombosis was seen as a life-threatening entity associated with acute presentation, with these two entities considered to be associated with different pathogenetic substrates. However, the presence—to a different extent—of common imaging findings such as in-stent necrotic core, neointimal rupture, and thrombus in both entities implies that these two presentations can occur as different manifestations of the same unfavorable healing process.

Neoatherosclerosis and bioresorbable scaffolds

Bioresorbable vascular scaffolds (BVS) are a new technology for percutaneous revascularization that are resorbed after an interval of 2–4 years since implantation. Conceptually, after this interval, the permanent vessel caging with the associated endothelial dysfunction disappears and this can lead to a reduction of stent-induced complications such as hypersensitivity reactions or neoatherosclerosis. First-in-man studies of BRS have demonstrated a favorable healing response at a very long-term follow-up with complete strut reabsorption, late luminal enlargement, and a potentially favorable plaque modification, while no cases of necrotic core accumulation of adluminal origin were observed [57]. As after bioresorption, the area corresponding to struts and neointima is consolidated with the underlying plaque, it resembles a native atherosclerotic plaque that is now well separated by the lumen by a signal-rich layer, a process modulated by hemodynamic factors [58] (Fig. 6). Nevertheless, as these first-in-man studies have focused on simple lesions, data on more complex lesions including thrombotic lesions are scarce [59]. Studies on more complex populations are ongoing, without, however, any worrying signs regarding neoatherosclerosis development in human studies of BVS thus far. Moreover, studies reporting on (very) late BVS thrombosis have not shown any evidence of scaffold thrombosis due to neointimal plaque rupture [60]. Therefore, the further development and implementation in the clinical practice of bioresorbable technologies might allow these complications to be overcome, although more long-term data are needed to confirm a potential benefit of this technology.

Newer OCT techniques for assessment of neoatherosclerosis

As previously mentioned, OCT is associated with some limitations in assessment of neoatherosclerosis. Nevertheless, new developments in OCT could improve in-stent tissue characterization and provide an enhanced and more objective neointimal tissue characterization. One of these developments is quantitative attenuation imaging. Tissue properties such as attenuation have been shown in ex vivo studies to be associated with the presence of macrophages and/or necrotic core [61, 62], while in vivo studies have demonstrated the potential of this technique for the detection of lipid plaques and fibroatheromas [63]. Therefore, this technique could be used for the assessment of neoatherosclerosis, since the optical properties of tissue components such as macrophages and a necrotic core are similar between native atherosclerosis and neoatherosclerosis. OCT assessment of neoatherosclerosis can also be improved through software for automated fibrous cap thickness measurement that can reduce human variability in the assessment of in-stent fibroatheromas [64]. Furthermore, the application of technologies such as polarization-sensitive OCT in humans can provide further structural information such as collagen and smooth muscle content of neointimal tissue [65], while high-speed OCT catheters will be able to acquire images from an entire coronary artery in less than 1 s [66].

Conclusion and perspectives

Recent evidence has highlighted the significance of in-stent neoatherosclerosis as a disease entity that comprises an important substrate for late adverse cardiac events after stent implantation and is one of the major pitfalls of the current generation of metallic stents. Pathological studies have demonstrated that infiltration of lipid-laden foamy macrophages with or without necrotic core and/or calcification formation constitutes the pathological substrate. A number of in vivo studies have used OCT—an imaging modality that can accurately identify morphological characteristics such as in-stent necrotic core, in-stent calcification, macrophage infiltration, and neointimal plaque rupture—in order to assess the in vivo characteristics and implications of this disease entity. These have demonstrated that neoatherosclerosis appears earlier and more frequently in drug-eluting stents compared with bare metal stents, is associated with several clinical and morphological factors, while its prevalence increases over time. Importantly, an association of neoatherosclerosis with late stent failure has been demonstrated, manifesting either as late restenosis, or in cases with neointimal plaque rupture as late stent thrombosis. Bioresorbable technologies hold promise for the reduction of this entity; however, their long-term healing response needs to be better documented. Further studies are needed so as to demonstrate what the prognostic implications of neoatherosclerosis detection are, and whether the natural history of this disease entity can be modified. Meanwhile, new devices for percutaneous revascularization need to be developed that can alleviate this entity, in order to be able to reduce the incidence of very late events after percutaneous coronary intervention.

Compliance with ethical guidelines

Conflict of interest

B.C. Zhang, A. Karanasos, and E. Regar state that there are no conflicts of interest. The accompanying manuscript does not include studies on humans or animals.
Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://​creativecommons.​org/​licenses/​by/​4.​0/​), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Metadaten
Titel
OCT demonstrating neoatherosclerosis as part of the continuous process of coronary artery disease
verfasst von
B.-C. Zhang
A. Karanasos
E. Regar, MD, PhD
Publikationsdatum
01.09.2015
Verlag
Urban & Vogel
Erschienen in
Herz / Ausgabe 6/2015
Print ISSN: 0340-9937
Elektronische ISSN: 1615-6692
DOI
https://doi.org/10.1007/s00059-015-4343-y

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