Publications by authors named "Niklas F Boeder"

Background: Percutaneous coronary intervention (PCI) is the standard-of-care treatment for left main stenosis as an alternative to bypass surgery. In addition, severe coronary lesion calcification can be modified by intravascular lithotripsy (IVL). However, with PCI and debulking treatment options, there are inherent limitations.

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Background: Patients with severe tricuspid regurgitation present late and are often ineligible for surgery or transcatheter repair systems. Transfemoral venous implantation of a bicaval valved stent has been proposed as therapeutic option in selected patients. The aim of this study was to summarize the early procedural and clinical outcomes of the novel TRICENTO system for the treatment of patients with symptomatic severe tricuspid regurgitation.

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Introduction: Initial trials of bioresorbable vascular scaffolds (BVS) have mostly excluded patients presenting with acute coronary syndrome (ACS). However, these patients might benefit from a BVS platform, in particular as they are often younger and have been less frequently treated than patients with chronic disease.

Aim: To compare the acute performance of a Novolimus eluting BVS in ACS and non-ACS patients using optical coherence tomography (OCT) in patients presenting with acute or chronic coronary syndrome.

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Background A recent study reported that the outcome of patients with plaque erosion treated with stenting is poor when the underlying plaque is lipid rich. However, the detailed phenotype of patients with plaque erosion, particularly as related to different age groups, has not been systematically studied. Methods and Results Patients with acute coronary syndromes caused by plaque erosion were selected from 2 data sets.

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Background: South Asians, and Indians in particular, are known to have a higher incidence of premature atherosclerosis and acute coronary syndromes (ACS) with worse clinical outcomes, compared to populations with different ethnic backgrounds. However, the underlying pathobiology accounting for these differences has not been fully elucidated.

Methods: ACS patients who had culprit lesion optical coherence tomography (OCT) imaging were enrolled.

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After the bioresorbable PLLA-based vascular scaffold (Absorb BVS) was taken from the market due to its high adverse event rates, a magnesium-based scaffold (Magmaris) was introduced. To compare the acute performance of the sirolimus-eluting magnesium alloy Magmaris scaffold with that of the novolimus-eluting PLLA-based DESolve scaffold in terms of appropriate scaffold deployment using optical coherence tomography (OCT). Data from the final OCT pullback of 98 patients were included (19 Magmaris, 79 DESolve) and analyzed at 1-mm intervals.

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Aims: We aimed to investigate predictors of scaffold failure and the potential impact of an optimized scaffold implantation technique by means of a learning curve on long-term clinical outcome after bioresorbable scaffold (BRS) implantation and to evaluate predictors of scaffold failure.

Methods And Results: A total of 3326 patients were included in this prospective, observational, multi-center study (ClinicalTrials.gov NCT02066623) of consecutive patients undergoing BRS implantation between November 2013 and January 2016.

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Introduction: The frequency, characteristics and clinical implications of Strut fractures (SFs) remain incompletely understood.

Methods And Results: A total of 185 (160 patients) newer-generation drug-eluting stents (DES) were imaged. SFs were found in 21 DES (11.

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We report the case of a 64-year-old patient with history of chronic kidney disease on dialysis who was repeatedly hospitalized due to hydropic decompensation. Right heart failure with secondary severe tricuspid regurgitation was diagnosed. An interventional approach was recommended due to the heavy calcification of the sinus venosus and the perioperative risk (EuroScore II 3.

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Antiplatelet agents and statin therapies are widely used in patients with known cardiovascular disease. Plaque rupture (PR) and plaque erosion (PE) are the most frequent underlying mechanisms of acute coronary syndromes (ACS). The conditions and medications that are associated with ST-segment elevation myocardial infarction (STEMI) following PR or PE have not been systematically studied.

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Previous studies have reported a circadian variation in the onset of ST-segment elevation myocardial infarction (STEMI). However, underlying mechanisms for the circadian variation have not been fully elucidated. We investigated the relationship between onset of STEMI and the underlying pathology using optical coherence tomography (OCT).

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Background Seasonal variations in acute coronary syndromes (ACS) have been reported, with incidence and mortality peaking in the winter. However, the underlying pathophysiology for these variations remain speculative. Methods and Results Patients with ACS who underwent optical coherence tomography were recruited from 6 countries.

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We report the case of a 70-year-old patient with history of chronic heart disease who underwent bypass surgery twice beforehand and was admitted due to non-ST segment elevation myocardial infarction. Angiography showed degeneration of all bypass grafts except the LIMA bypass, which showed significant ostial stenosis with severe calcification. Peri-operative risk was computed to be as high as 12.

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Article Synopsis
  • Ethnic differences in how acute coronary syndromes (ACS) develop were analyzed by comparing Asians and Whites, focusing on patient characteristics and underlying mechanisms.
  • Among 1,225 patients studied, Asians had higher rates of diabetes and hypertension in STEMI cases, while NSTE-ACS patients showed more diabetes and renal issues compared to Whites.
  • Although there were similarities in plaque characteristics for STEMI cases between the two groups, Whites had a significantly higher risk of calcified plaque in NSTE-ACS patients after accounting for other health factors.
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Background Plaque erosion is responsible for 25% to 40% of patients with acute coronary syndromes (ACS). Recent studies suggest that anti-thrombotic therapy without stenting may be an option for this subset of patients. Currently, however, an invasive procedure is required to make a diagnosis of plaque erosion.

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Postmortem studies reported plaque erosion is frequent in young women. Recent in vivo studies failed to show age and sex differences in the plaque erosion prevalence. The aim of this study was to investigate the prevalence of plaque erosion by age and sex among acute coronary syndromes (ACS) patients.

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Aims: To examine the clinical experience and practical use of the PASCAL transcatheter valve repair system (Edwards Lifesciences, Irvine, CA, USA) and to report some of the first clinical results.

Methods And Results: A total of 18 consecutive patients with severe, symptomatic mitral regurgitation (MR) were included in this German multicentre registry. All patients underwent clinical, echocardiographic, and laboratory assessment prior to the PASCAL procedure and before hospital discharge.

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Malapposition is a common finding in stent and scaffold thrombosis (ScT). Evidence from studies with prospective follow-up, however, is scarce. We hypothesized that incidental observations of strut malapposition might be predictive of late ScT during subsequent follow-up.

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Objectives: This study conducted detailed analysis of calcified culprit plaques in patients with acute coronary syndromes (ACS).

Background: Calcified plaques as an underlying pathology in patients with ACS have not been systematically studied.

Methods: From 1,241 patients presenting with ACS who had undergone pre-intervention optical coherence tomography imaging, 157 (12.

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Objective: This study of patients treated with novolimus-eluting bioresorbable scaffold (BRS) investigated the impact of plaque burden on the acute mechanical performance of the BRS and the short-term outcome.

Methods: A total of 15 patients were enrolled. The following parameters were derived from optical coherence tomography (OCT) during the final pullback: mean and minimum area, residual area stenosis, incomplete strut apposition, tissue prolapse, scaffold expansion index (SEI), scaffold eccentricity index (SEC), symmetry index, strut fracture, and edge dissection.

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Objective: To evaluate the acute performance of a novolimus-eluting bioresorbable scaffold (BRS) with different strut thickness (DESolve system 150 and 100) using optical coherence tomography (OCT) in terms of appropriate scaffold deployment.

Background: Outcome after BRS implantation seen in registries and meta-analyses continue to show a higher rate of scaffold thrombosis than those reported with DES. Thus, second scaffold generations with lower strut thickness might have potential advantages in terms of flow disturbance.

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Objectives: To examine ischemic and bleeding outcomes in patients on triple antithrombotic therapy (TAT) compared with dual antiplatelet therapy (DAPT) after the implantation of bioresorbable scaffolds (BRS).

Background: The optimal antithrombotic regimen in patients undergoing percutaneous coronary intervention that have an indication for oral anticoagulation is unclear, in particular among those undergoing BRS implantation.

Methods: Consecutive patients of a single-center, all-comers BRS registry were included.

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Background: The MitraClip procedure can be an alternative treatment option for patients with high surgical risk for whom surgical treatment is contraindicated. Patients with prosthetic material have an increased risk for infective endocarditis.

Hypothesis: Incidence, treatment and outcome of patients with endocarditis after interventional mitral valve repair are not known.

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A 64-year old woman was referred to the division of cardiology due to recurrent angina pectoris (CCS III). The patient's symptoms and high cardiovascular risk profile were an indication for coronary angiography. Relevant coronary heart disease was hereby ruled out; however, angiography showed a direct drainage of coronary vessels into the chambers.

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Aims: To evaluate the acute performance of a novolimus-eluting bioresorbable scaffold (BRS) with a nominal diameter of 4.0mm (DESolve® XL) using optical coherence tomography (OCT) in terms of appropriate scaffold deployment.

Methods And Results: Ten patients (55.

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