Publications by authors named "David A Halon"

Background: The increased risk for cardiovascular events in diabetics is heterogeneous and contemporary clinical risk score calculators have limited predictive value. We therefore examined the additional value of coronary artery calcium score (CACS) in outcome prediction in type 2 diabetics without clinical coronary artery disease (CAD).

Methods: The study examined a population-based cohort of type 2 diabetics (n = 735) aged 55-74 years, recruited between 2006 and 2008.

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Introduction: Coronary artery disease and malignancy occur more frequently in patients with type 2 diabetes. They may share inflammation as a possible common pathogenetic mechanism, but it is unclear whether a clinical correlation exists between them.

Methods: This prospective cohort study followed 735 asymptomatic diabetics, aged 63.

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Objective: To determine whether coronary computed tomography angiography (CTA) should be performed in patients with any clinical probability of coronary artery disease (CAD), and whether the diagnostic performance differs between subgroups of patients.

Design: Prospectively designed meta-analysis of individual patient data from prospective diagnostic accuracy studies.

Data Sources: Medline, Embase, and Web of Science for published studies.

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Background: Contemporary data on clinical profiles and long-term outcomes of young adults with coronary artery disease (CAD) are limited.

Objectives: To determine the risk profile, presentation, and outcomes of young adults undergoing coronary angiography.

Methods: A retrospective analysis (2000-2017) of patients aged ≤ 35 years undergoing angiography for evaluation and/or treatment of CAD was conducted.

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The original version of this article, published on 19 March 2018, unfortunately contained a mistake. The following correction has therefore been made in the original: The names of the authors Philipp A. Kaufmann, Ronny Ralf Buechel and Bernhard A.

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Objectives: The authors used coronary computed tomography angiography (CTA) to determine plaque characteristics predicting individual late plaque events precipitating acute coronary syndromes (ACS) in a cohort of asymptomatic type 2 diabetic patients.

Background: In patients with coronary artery disease, CTA plaque characteristics may predict mid-term patient events.

Methods: Asymptomatic patients with diabetes 55 to 74 years of age with no history of coronary artery disease (N = 630) underwent baseline 64-slice CTA and detailed plaque level analysis.

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Objectives: To analyse the implementation, applicability and accuracy of the pretest probability calculation provided by NICE clinical guideline 95 for decision making about imaging in patients with chest pain of recent onset.

Methods: The definitions for pretest probability calculation in the original Duke clinical score and the NICE guideline were compared. We also calculated the agreement and disagreement in pretest probability and the resulting imaging and management groups based on individual patient data from the Collaborative Meta-Analysis of Cardiac CT (CoMe-CCT).

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Background: Coronary artery disease often progresses more rapidly in diabetics, but the integrated impact of diabetes and early revascularization status on late or repeat revascularization in the contemporary era is less clear.

Methods: Coronary angiography was performed in 12,420 patients between the years 2000-2015 and early revascularization status [none, percutaneous coronary intervention (PCI) or bypass surgery (CABG)] was determined. Subsequent revascularization procedures were recorded over a median follow-up of 67 months and its relation to diabetic and baseline revascularization status was studied.

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We examined 18,654 patients who underwent cardiac catheterization in a single center to clarify the association between catheterization indication, body mass index (BMI), and long-term survival over a mean follow-up of 81 months. Patients were grouped by indication for catheterization: (a) acute coronary syndromes (ACS), 7,426 patients; (b) coronary artery disease (CAD) evaluation in stable clinical presentation, 6,911 patients; and (c) primarily non-CAD cardiac evaluations, 4,317 patients. Compared with normal weight, overweight and obesity (but not morbid obesity) was associated with lower risk of long-term mortality.

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Background: Outcomes of patients with acute ST-elevation myocardial infarction (STEMI) are strongly correlated to the time interval from hospital entry to primary percutaneous coronary intervention (PPCI). Current guidelines recommend a door to balloon time of < 90 minutes.

Objectives: To reduce the time from hospital admission to PPCI and to increase the proportion of patients treated within 90 minutes.

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Objectives: Predictive models for heart failure (HF) in heterogeneous populations have had limited success. We examined cardiac computed tomography angiography (CTA) predictors of HF or cardiovascular death (HF-CVD) in a prospective study of asymptomatic diabetics undergoing baseline assessment by CTA.

Methods: The subjects (n = 735, aged 55-74 years, 51.

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Background: Familial hypercholesterolemia (FH) is associated with premature atherosclerotic cardiovascular disease (ASCVD). The introduction of potent therapeutic agents underlies the importance of improving clinical diagnosis and treatment gaps in FH.

Methods and results: A regional database of 1,690 adult patients with high-probability FH based on age-dependent peak-low-density lipoprotein cholesterol (LDL-C) cut-offs and exclusion of secondary causes of severe hypercholesterolemia, was examined to explore the clinical manifestations and current needs in the management of ASCVD, which was present in 248 patients (15%), of whom 83% had coronary artery disease (CAD); 19%, stroke; and 13%, peripheral artery disease.

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To understand the current impact of diabetes mellitus (DM) on long-term outcomes among patients referred for coronary angiography, we studied 14,337 consecutive patients (5,279 diabetic patients [37%]) referred to coronary angiography for assessment or treatment of coronary artery disease. We investigated long-term all-cause mortality and its interaction with hypoglycemic therapy and presenting coronary status. At baseline, patients with DM had more hypertension, hyperlipidemia, and renal failure; more were women, overweight, and more had previous coronary interventions.

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Background Familial hypercholesterolemia is characterized by markedly increased low-density lipoprotein cholesterol and risk for premature atherosclerotic cardiovascular disease. Models of care vary and reflect differing health policies and resources. The availability of electronic databases may enable better identification and assessment of familial hypercholesterolemia in the community.

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Background: Patients with severe familial hypercholesterolemia (FH) are often unrecognized despite typical presentation. The introduction of PCSK9 inhibitors opens new therapeutic options and emphasizes the need for identification of severe FH patients.

Objectives: The objective was identification, characterization, and management of severe FH patients by screening of cardiac catheterization (CC) database.

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Background: Radial artery occlusion (RAO) may occur following transradial catheterization, precluding future use of the vessel for vascular access or as a coronary bypass graft. Recanalization of RAO may occur; however, long-term radial artery patency when revascularization is more likely to be required has not been investigated. Transradial catheterization is usually performed via 5-Fr or 6-Fr catheters.

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Background: Type 2 diabetics are at increased risk for vascular events, but the value of further risk stratification for coronary heart disease (CHD) in asymptomatic subjects is unclear. We examined the added value of coronary computed tomography angiography over clinical risk scores (United Kingdom Prospective Diabetes Study), and coronary artery calcium in a population-based cohort of asymptomatic type 2 diabetics.

Methods And Results: Subjects (n=630) underwent baseline clinical assessment and computed tomography angiography (64-slice scanner).

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Background: Autonomic control of the cardiovascular system may be impaired in type 2 diabetes and is associated with increased morbidity and mortality. Parameters obtained during stress testing may reflect early stages of cardiac autonomic dysfunction and provide prognostic information in asymptomatic type 2 diabetes.

Methods: We performed maximal exercise treadmill testing in 594 patients with type 2 diabetes without known coronary heart disease.

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A 256-slice coronary computed tomography angiography (CCTA) is an accurate method for detection and exclusion of obstructive coronary artery disease (OBS-CAD). However, accurate image interpretation requires expertise and may not be available at all hours. The purpose of this study was to evaluate the usefulness of a fully automated computer-assisted diagnosis (COMP-DIAG) tool for exclusion of OBS-CAD in patients in the emergency department (ED) presenting with chest pain.

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Background: Despite its well-established prognostic value, cardiorespiratory fitness (CRF) is not incorporated routinely in risk assessment tools. Whether low CRF provides additional predictive information in asymptomatic type 2 diabetics beyond conventional risk scores and coronary artery calcification (CAC) is unclear.

Methods: We studied 600 type 2 diabetics aged 55-74 years without known coronary heart disease.

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Flow-limiting aorto-ostial coronary lesions are clinically important because they subtend a large myocardial territory and may induce extensive myocardial ischemia. Diagnosis and treatment of these lesions is challenging and procedural success and clinical outcomes are inferior to non-ostial lesions. The purpose of this review is to summarize current knowledge regarding aorto-ostial percutaneous coronary intervention and to suggest novel approaches for optimizing these procedures.

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Background: Impaired cardiorespiratory fitness (CRF) is a potent risk factor for mortality in diabetes, and may modify the relation between adiposity and mortality. We evaluated the interaction between CRF and abdominal adiposity distribution with all-cause mortality, myocardial infarction or stroke in patients with diabetes.

Methods: We studied 294 type 2 diabetics without known coronary artery disease.

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Aims: Accurate positioning of aorto-ostial coronary stents is challenging. Coronary CT angiography (CCTA) allows detailed imaging of the coronary sinuses and implanted stents. We utilised CCTA to evaluate the accuracy of aorto-ostial stenting and to assess the efficacy of conventional angiography for guiding these procedures.

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