Quantitative coronary three-dimensional geometry and its association with atherosclerotic disease burden and composition.

BACKGROUND: Isolate features of the coronary anatomy have been associated with the pathophysiology of atherosclerotic disease. Computational methods have been described to allow precise quantification of the complex three-dimensional (3D) coronary geometry. The present study tested whether quantitative parameters that describe the spatial 3D coronary geometry is associated with the extension and composition of the underlying coronary artery disease (CAD). METHODS: Patients with CAD scheduled for percutaneous intervention were investigated with coronary computed tomography angiography (CCTA), and invasive coronary angiography, and virtual histology intravascular ultrasound (IVUS-VH). For all target vessels, 3D centerlines were extracted from CCTA images and processed to quantify 23 geometric indexes, grouped into 3 main categories as follows: (i) length-based; (ii) curvature-based, torsion-based, and curvature/torsion-combined; (iii) vessel path-based. The geometric variables were compared with IVUS-VH parameters assessing the extent and composition of coronary atherosclerosis. RESULTS: A total of 36 coronary patients (99 vessels) comprised the study population. From the 23 geometric indexes, 18 parameters were significantly (p < 0.05) associated with at least 1 IVUS-VH parameter at a univariate analysis. All three main geometric categories provided parameters significantly related with atherosclerosis variables. The 3D geometric indexes were associated with the degree of atherosclerotic extension, as well as with plaque composition. Geometric features remained significantly associated with all IVUS-VH parameters even after multivariate adjustment for clinical characteristics. CONCLUSIONS: Quantitative 3D vessel morphology emerges as a relevant factor associated with atherosclerosis in patients with established CAD.

Zero-contrast imaging for the assessment of transcatheter aortic valve implantation in candidates with renal dysfunction.

BACKGROUND: Candidates for transcatheter aortic valve implantation (TAVI) are currently evaluated using computed tomography angiography and invasive cardiac catheterization as an essential part of case selection and pre-procedure interventional planning. However, both imaging methods utilize iodinated agents, which may cause contrast-induced nephropathy, particularly in patients with baseline renal dysfunction. This study aimed to describe a zero-contrast imaging protocol for pre-TAVI evaluation in patients with advanced renal impairment. METHODS: The pre-TAVI zero-contrast scheme consisted of the following multi-modality combinations: (1) gadolinium-free magnetic resonance imaging (three-dimensional navigator-echo with electrocardiogram-gated steady-state free-precession series); (2) iodinated-free multislice computed tomography electrocardiogram-gated; (3) lower limb arterial duplex scan ultrasound; and (4) transesophageal echocardiography. Ultimately, TAVI was performed for those deemed good candidates, and contrast was allowed during the intervention; however, operators were strongly advised to utilize the least volume possible of iodinated agents. This pilot survey included ten patients with symptomatic aortic stenosis and renal dysfunction who underwent zero-contrast multi-modality imaging. RESULTS: All the patients ultimately underwent TAVI. The intervention was successful in all cases, without ≥ moderate residual aortic regurgitation, prosthesis embolization, annulus rupture, major vascular complications, stroke, or death during index hospitalization. The creatinine clearance remained stable throughout the observation period (baseline: 26.85 ± 12.55 mL/min; after multi-modality imaging: 26.76 ± 11.51 mL/min; post-TAVI at discharge: 29.84 ± 13.98 mL/min; p = 0.3 all). CONCLUSION: The proposed contrast-free imaging protocol appears to be a promising clinical tool for pre-TAVI evaluation in patients with severe renal dysfunction.

Comparison of intravascular lithotripsy and rotational atherectomy for the treatment of heavily calcified coronary lesions: the STIFF (Stenoses with calcificaTIon treated with angioplasty eFFected with dedicated interventional tools) study.

BACKGROUND: Percutaneous coronary interventions in heavily calcified coronary lesions are associated with technical difficulties and the worse prognosis. Lesion preparation is important to reduce complications and improve outcomes. The aim of this study is to compare the results of rotational atherectomy (RA) and intravascular lithotripsy (IVL) at achieving optimal stent implantation using intravascular ultrasound criteria. METHODS: Retrospective, single-center study comparing patients with heavily calcified coronary lesions that underwent percutaneous coronary interventions using RA or IVL. RESULTS IN TOTAL: 25 patients (13 in the RA group and 12 in the IVL group) were included. Reference vessel diameter was similar between the groups [2.59 (2.51-3.63) mm in the RA group vs. 2.79 (2.59-3.16) mm in the IVL group; P = 0.89], as were minimal lumen area [1.02 (0.80-1.23) mm vs. 1.40 (1.01-1.40) mm; P = 0.43] and diameter stenosis [60.4% (52.3-72.3) vs. 56.1% (47.8-61.3); P = 0.56). The final minimal lumen area was significantly larger in the IVL group [7.6 mm2 (5.8-8.6) vs. 5.4 mm2 (4.5-6.2); P = 0.01] as were lumen area gain [4.1 mm2 (2.6-5.9) vs. 2.3 mm2 (1.4-3.6); P = 0.01] and final stent volume [491.2 mm3 (372.2-729.8) vs. 326.2 mm3 (257.1-435.4); P = 0.03]. In the RA group, 69.2% of the patients achieved the preestablished intravascular ultrasound-based criteria for successful stent implantation, vs. 100% of the patients in the IVL group (P = 0.04). CONCLUSION: Patients in the IVL group achieved the Intravascular Ultrasound Versus Angiography-Guided Drug-Eluting Stent Implantation trial criteria of successful stent implantation more frequently than those treated with RA.

Inflammatory Phenotype by OCT Coronary Imaging: Specific Features Among De Novo Lesions, In-Stent Neointima, and In-Stent Neo-Atherosclerosis. / Fenótipo Inflamatório por Imagem de OCT Coronária: Características Específicas Entre Lesões De Novo, Hiperplasia Intimal e Neoaterosclerose Intra-Stent.

BACKGROUND: Coronary stenosis can be caused de novo atherosclerosis, in-stent restenosis, and in-stent neoatherosclerosis, three entities that develop from a diverse pathophysiological milieu. OBJECTIVE: This study aims to investigate, using optical coherence tomography (OCT), whether or not coronary lesions related to these processes differ in their local inflammatory profile. METHODS: Retrospective analysis of patients with diagnosed or suspected coronary lesions who had undergone OCT imaging for clinical reasons. Macrophage and intra-plaque neovascularization were assessed by OCT and used as surrogates of local inflammation. A significance level of < 0.05 was adopted as statistically significant. RESULTS: From the 121 lesions, 74 were de novo, 29 were restenosis, and 18 were neoatherosclerosis. Neovascularization was found in 65.8% of de novo, 10.3% in restenosis, and 94.4% in neoatherosclerosis (p<0.01 for all). The volume of neovascularization was different among lesion types (950 vs. 0 vs. 6220, respectively [median values in 1000 x µm3/mm]; p<0.01 for all), which were significantly higher in neoatherosclerosis and lower in restenosis. The presence of macrophages differed among the lesions (95.9% in de novo vs. 6.9% in restenosis vs. 100% in neoatherosclerosis [p<0.01 for all]). Moreover, the intensity of macrophagic infiltration was different among lesion types (2.5 vs. 0.0 vs. 4.5, respectively [median values of macrophage score]; p<0.01 for all), significantly higher in neoatheroscleosis and lower in restenosis. CONCLUSION: When compared using coronary OCT, de novo atherosclerosis, in-stent restenosis, and neoatherosclerosis presented markedly different inflammatory phenotypes.

FUNDAMENTO: A estenose coronária pode ser causada por de novo aterosclerose, reestenose intra-stent e neoaterosclerose intra-stent, três entidades que se desenvolvem a partir de diversos meios fisiopatológicos. OBJETIVOS: Este estudo tem como objetivo investigar, por meio da tomografia de coerência óptica (OCT), se as lesões coronarianas relacionadas a esses processos diferem em seu perfil inflamatório local. MÉTODOS: Análise retrospectiva de pacientes com lesões coronárias diagnosticadas ou suspeitas que realizaram exames de OCT por motivos clínicos. Macrófagos e neovascularização intraplaca foram avaliados por OCT e utilizados como marcadores de inflamação local. O nível de significância < 0,05 foi adotado como estatisticamente significante. RESULTADOS: Das 121 lesões, 74 eram de novo , 29 eram reestenose e 18 eram neoaterosclerose. Neovascularização foi encontrada em 65,8% das de novo , 10,3% na reestenose e 94,4% na neoaterosclerose (p<0,01 para todos). O volume de neovascularização foi diferente entre os tipos de lesão (950 vs. 0 vs. 6.220, respectivamente [valores medianos em 1000 x µm 3 /mm]; p<0,01 para todos), sendo significativamente maior na neoaterosclerose e menor na reestenose. A presença de macrófagos diferiu entre as lesões (95,9% em de novo vs. 6,9% em reestenose vs. 100% em neoaterosclerose [p<0,01 para todos]). Além disso, a intensidade da infiltração macrofágica foi diferente entre os tipos de lesão (2,5 vs. 0,0 vs. 4,5, respectivamente [valores medianos do escore de macrófagos]; p<0,01 para todos), significativamente maior na neoaterosclerose e menor na reestenose. CONCLUSÕES: Quando comparados pela OCT coronariana, de novo , reestenose intra-stent e neoaterosclerose apresentaram fenótipos inflamatórios marcadamente diferentes.

Safety and effectiveness of introducing a robotic-assisted percutaneous coronary intervention program in a tertiary center: a prospective study.

Background: Robotic-assisted percutaneous coronary intervention (PCI) is a novel technology that permits remote operation of interventional devices. However, little is known about the safety and effectiveness of introducing a robotic PCI program in a hospital already experienced in traditional coronary angioplasty. Methods: Prospective single-arm survey to assess the safety and effectiveness of robotic-assisted PCI in comparison to pre-defined performance goals. The study cohort comprised all consecutive cases treated with robotic PCI since its introduction. The safety primary endpoint was a composite of (I) overall death or (II) non-fatal adverse events related to target vessel complications (stent thrombosis, myocardial infarction, vessel perforation or cardiac tamponade, or repeat invasive treatment) during the index hospitalization. The efficacy primary endpoint was robotic-assisted procedural success, a composite of (I) successful dilatation of the target lesion and (II) successful robotic assistance, defined as absent non-planned manual conversion. Results: A total of 83 patients and 112 lesions were prospectively enrolled. The rate of angiographic success was 99.1%. From these, 97 lesions (86.6%) were treated with only robotic PCI or with hybrid according to the pre-interventional plan. The rates of efficacy and safety primary endpoints were 85.7% and 2.4% respectively (P<0.01 for non-inferior to the pre-defined performance threshold). Conclusions: Introduction of robotic-assisted PCI in a tertiary center was associated with safe and effective results, comparable to pre-defined goals of optimal performance.

Fenótipo Inflamatório por Imagem de OCT Coronária: Características Específicas Entre Lesões De Novo, Hiperplasia Intimal e Neoaterosclerose Intra-Stent / Inflammatory Phenotype by OCT Coronary Imaging: Specific Features Among De Novo Lesions, In-Stent Neointima, and In-Stent Neo-Atherosclerosis

Resumo Fundamento A estenose coronária pode ser causada por de novo aterosclerose, reestenose intra-stent e neoaterosclerose intra-stent, três entidades que se desenvolvem a partir de diversos meios fisiopatológicos. Objetivos Este estudo tem como objetivo investigar, por meio da tomografia de coerência óptica (OCT), se as lesões coronarianas relacionadas a esses processos diferem em seu perfil inflamatório local. Métodos Análise retrospectiva de pacientes com lesões coronárias diagnosticadas ou suspeitas que realizaram exames de OCT por motivos clínicos. Macrófagos e neovascularização intraplaca foram avaliados por OCT e utilizados como marcadores de inflamação local. O nível de significância < 0,05 foi adotado como estatisticamente significante. Resultados Das 121 lesões, 74 eram de novo , 29 eram reestenose e 18 eram neoaterosclerose. Neovascularização foi encontrada em 65,8% das de novo , 10,3% na reestenose e 94,4% na neoaterosclerose (p<0,01 para todos). O volume de neovascularização foi diferente entre os tipos de lesão (950 vs. 0 vs. 6.220, respectivamente [valores medianos em 1000 x µm 3 /mm]; p<0,01 para todos), sendo significativamente maior na neoaterosclerose e menor na reestenose. A presença de macrófagos diferiu entre as lesões (95,9% em de novo vs. 6,9% em reestenose vs. 100% em neoaterosclerose [p<0,01 para todos]). Além disso, a intensidade da infiltração macrofágica foi diferente entre os tipos de lesão (2,5 vs. 0,0 vs. 4,5, respectivamente [valores medianos do escore de macrófagos]; p<0,01 para todos), significativamente maior na neoaterosclerose e menor na reestenose. Conclusões Quando comparados pela OCT coronariana, de novo , reestenose intra-stent e neoaterosclerose apresentaram fenótipos inflamatórios marcadamente diferentes.

Abstract Background Coronary stenosis can be caused de novo atherosclerosis, in-stent restenosis, and in-stent neoatherosclerosis, three entities that develop from a diverse pathophysiological milieu. Objective This study aims to investigate, using optical coherence tomography (OCT), whether or not coronary lesions related to these processes differ in their local inflammatory profile. Methods Retrospective analysis of patients with diagnosed or suspected coronary lesions who had undergone OCT imaging for clinical reasons. Macrophage and intra-plaque neovascularization were assessed by OCT and used as surrogates of local inflammation. A significance level of < 0.05 was adopted as statistically significant. Results From the 121 lesions, 74 were de novo, 29 were restenosis, and 18 were neoatherosclerosis. Neovascularization was found in 65.8% of de novo, 10.3% in restenosis, and 94.4% in neoatherosclerosis (p<0.01 for all). The volume of neovascularization was different among lesion types (950 vs. 0 vs. 6220, respectively [median values in 1000 x µm3/mm]; p<0.01 for all), which were significantly higher in neoatherosclerosis and lower in restenosis. The presence of macrophages differed among the lesions (95.9% in de novo vs. 6.9% in restenosis vs. 100% in neoatherosclerosis [p<0.01 for all]). Moreover, the intensity of macrophagic infiltration was different among lesion types (2.5 vs. 0.0 vs. 4.5, respectively [median values of macrophage score]; p<0.01 for all), significantly higher in neoatheroscleosis and lower in restenosis. Conclusion When compared using coronary OCT, de novo atherosclerosis, in-stent restenosis, and neoatherosclerosis presented markedly different inflammatory phenotypes.