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  1. Article ; Online: Current Toolset in Predicting Acute Coronary Thrombotic Events

    Maria Emfietzoglou / Michail C. Mavrogiannis / Hector M. García-García / Kimon Stamatelopoulos / Ioannis Kanakakis / Michail I. Papafaklis

    Life, Vol 13, Iss 696, p

    The “Vulnerable Plaque” in a “Vulnerable Patient” Concept

    2023  Volume 696

    Abstract: Despite major advances in pharmacotherapy and interventional procedures, coronary artery disease (CAD) remains a principal cause of morbidity and mortality worldwide. Invasive coronary imaging along with the computation of hemodynamic forces, primarily ... ...

    Abstract Despite major advances in pharmacotherapy and interventional procedures, coronary artery disease (CAD) remains a principal cause of morbidity and mortality worldwide. Invasive coronary imaging along with the computation of hemodynamic forces, primarily endothelial shear stress and plaque structural stress, have enabled a comprehensive identification of atherosclerotic plaque components, providing a unique insight into the understanding of plaque vulnerability and progression, which may help guide patient treatment. However, the invasive-only approach to CAD has failed to show high predictive value. Meanwhile, it is becoming increasingly evident that along with the “vulnerable plaque”, the presence of a “vulnerable patient” state is also necessary to precipitate an acute coronary thrombotic event. Non-invasive imaging techniques have also evolved, providing new opportunities for the identification of high-risk plaques, the study of atherosclerosis in asymptomatic individuals, and general population screening. Additionally, risk stratification scores, circulating biomarkers, immunology, and genetics also complete the armamentarium of a broader “vulnerable plaque and patient” concept approach. In the current review article, the invasive and non-invasive modalities used for the detection of high-risk plaques in patients with CAD are summarized and critically appraised. The challenges of the vulnerable plaque concept are also discussed, highlighting the need to shift towards a more interdisciplinary approach that can identify the “vulnerable plaque” in a “vulnerable patient”.
    Keywords coronary disease ; atherosclerosis ; coronary plaque ; myocardial infarction ; imaging ; shear stress ; Science ; Q
    Subject code 610
    Language English
    Publishing date 2023-03-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Role of FGF21 and Leptin for the Diagnosis of Metabolic Health in Children with and without Obesity

    Eleni M. Domouzoglou / Antonios P. Vlahos / Michail I. Papafaklis / Vasileios K. Cholevas / Nikolaos Chaliasos / Ekaterini Siomou / Lampros K. Michalis / Agathocles Tsatsoulis / Katerina K. Naka

    Journal of Personalized Medicine, Vol 13, Iss 12, p

    2023  Volume 1680

    Abstract: Obesity and unfavorable metabolic profiles increase the risk for cardiovascular complications in adults. Although it is important to distinguish different metabolic health states at an early stage, there are limited data on the related value of ... ...

    Abstract Obesity and unfavorable metabolic profiles increase the risk for cardiovascular complications in adults. Although it is important to distinguish different metabolic health states at an early stage, there are limited data on the related value of biomarkers in childhood. We aimed to identify biomarkers for the detection of different metabolic health states in children with and without obesity. The serum levels of metabolic regulators (fibroblast growth factor 21 [FGF21], leptin, adiponectin and insulin-like growth factor binding protein 1) and vascular indices (flow-mediated dilation [FMD] and carotid intima-media thickness) were assessed in 78 children. Differences between the metabolically healthy and unhealthy state within children with normal weight (MHN vs. MUN), and within children with overweight/obesity (MHO vs. MUO) were investigated; the discriminatory power of the biomarkers was studied. Both MUN and MUO groups expressed altered lipid and glucose homeostasis compared to their healthy counterparts. The metabolic unhealthy state in children with normal weight was linked to higher FGF21 levels which had good discriminatory ability (area under the curve [AUC]: 0.71, 95% CI: 0.54–0.88; p = 0.044). In overweight/obese children, leptin was increased in the metabolically unhealthy subgroup (AUC: 0.81, 95% CI: 0.68–0.95; p = 0.01). There was a decrease in FMD indicating worse endothelial function in overweight/obese children versus those with normal weight. Distinct states of metabolic health exist in both children with normal weight and overweight/obese children. FGF21 and leptin may help to identify the metabolic unhealthy state in children with normal weight and in overweight/obese children, respectively, early in life.
    Keywords obesity ; overweight ; fibroblast growth factor 21 ; leptin ; metabolism ; adiponectin ; Medicine ; R
    Subject code 360
    Language English
    Publishing date 2023-12-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Body Mass Index Is Independently Associated with the Presence of Ischemia in Myocardial Perfusion Imaging

    Chrissa Sioka / Paraskevi Zotou / Michail I. Papafaklis / Aris Bechlioulis / Konstantinos Sakellariou / Aidonis Rammos / Evangelia Gkika / Lampros Lakkas / Sotiria Alexiou / Pavlos Kekiopoulos / Katerina K. Naka / Christos Katsouras

    Medicina, Vol 58, Iss 8, p

    2022  Volume 987

    Abstract: Background and Objectives : Obesity has been linked to various cardiovascular risk factors, increased incidence of coronary artery disease, and myocardial perfusion defects. The aim of this study was to investigate if body mass index (BMI) and waist ... ...

    Abstract Background and Objectives : Obesity has been linked to various cardiovascular risk factors, increased incidence of coronary artery disease, and myocardial perfusion defects. The aim of this study was to investigate if body mass index (BMI) and waist circumference (WC) were associated with myocardial perfusion defects. Materials and Methods : A total of 308 consecutive patients who had myocardial perfusion imaging (MPI) with single photon emission computed tomography (SPECT) and a complete medical record on file were studied retrospectively. Results : The median age was 69 (61–76) years, the BMI was 27.6 (24.4–30.7) kg/m 2 , and the WC was 110 (102–118) cm. Of the 308 patients, 239 patients (77.6%) had myocardial ischemia. A positive test for ischemia was more frequent in men compared to women (72 vs. 28%, p < 0.001). Within the male group, BMI and WC were not significantly different between the ischemia and non-ischemia groups. In contrast, within the female group, both BMI (30.2 vs. 27.1 kg/m 2 , p = 0.002) and WC (112 vs. 105.5 cm, p = 0.020) were significantly higher in the ischemia group. Multivariable logistic regression showed that male sex and BMI were the only two independent predictors of ischemia in our patient population. Conclusions : This study showed that BMI was an independent predictor of ischemia in our patient population.
    Keywords myocardial perfusion imaging ; myocardial ischemia ; body mass index ; waist circumference ; obesity ; Medicine (General) ; R5-920
    Subject code 610
    Language English
    Publishing date 2022-07-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: Patient-Specific Simulation of Coronary Artery Pressure Measurements

    Panagiotis K. Siogkas / Michail I. Papafaklis / Antonis I. Sakellarios / Kostas A. Stefanou / Christos V. Bourantas / Lambros S. Athanasiou / Themis P. Exarchos / Katerina K. Naka / Lampros K. Michalis / Oberdan Parodi / Dimitrios I. Fotiadis

    BioMed Research International, Vol

    An In Vivo Three-Dimensional Validation Study in Humans

    2015  Volume 2015

    Abstract: Pressure measurements using finite element computations without the need of a wire could be valuable in clinical practice. Our aim was to compare the computed distal coronary pressure values with the measured values using a pressure wire, while testing ... ...

    Abstract Pressure measurements using finite element computations without the need of a wire could be valuable in clinical practice. Our aim was to compare the computed distal coronary pressure values with the measured values using a pressure wire, while testing the effect of different boundary conditions for the simulation. Eight coronary arteries (lumen and outer vessel wall) from six patients were reconstructed in three-dimensional (3D) space using intravascular ultrasound and biplane angiographic images. Pressure values at the distal and proximal end of the vessel and flow velocity values at the distal end were acquired with the use of a combo pressure-flow wire. The 3D lumen and wall models were discretized into finite elements; fluid structure interaction (FSI) and rigid wall simulations were performed for one cardiac cycle both with pulsatile and steady flow in separate simulations. The results showed a high correlation between the measured and the computed coronary pressure values (coefficient of determination [r2] ranging between 0.8902 and 0.9961), while the less demanding simulations using steady flow and rigid walls resulted in very small relative error. Our study demonstrates that computational assessment of coronary pressure is feasible and seems to be accurate compared to the wire-based measurements.
    Keywords Medicine ; R
    Subject code 621
    Language English
    Publishing date 2015-01-01T00:00:00Z
    Publisher Hindawi Limited
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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