Konstantinos Kalogeras

Dr. Konstantinos Kalogeras

orcid

Research Focus & Metrics

Academic Career Length

15Years (2012-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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18 January 2023 in Molecules
Verified
Journal Article
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Stamatios LampsasStamatios Lampsas
Stamatios Lampsas
MXMaria Xenou
Maria Xenou
EVANGELOS OIKONOMOUEVANGELOS OIKONOMOU
EVANGELOS OIKONOMOU
Panteleimon PantelidisPanteleimon Pantelidis
Panteleimon Pantelidis
ALAntonios Lysandrou
Antonios Lysandrou
GSGerasimos Siasos
Gerasimos Siasos
Lipoprotein(a) (Lp(a)) is a low-density lipoprotein (LDL) cholesterol-like particle bound to apolipoprotein(a). Increased Lp(a) levels are an independent, heritable causal risk factor for atherosclerotic cardiovascular disease (ASCVD) as they are largely determined by variations in the Lp(a) gene (LPA) locus encoding apo(a). Lp(a) is the preferential lipoprotein carrier for oxidized phospholipids (OxPL), and its role adversely affects vascular inflammation, atherosclerotic lesions, endothelial function and thrombogenicity, which pathophysiologically leads to cardiovascular (CV) events. Despite this crucial role of Lp(a), its measurement lacks a globally unified method, and, between different laboratories, results need standardization. Standard antilipidemic therapies, such as statins, fibrates and ezetimibe, have a mediocre effect on Lp(a) levels, although it is not yet clear whether such treatments can affect CV events and prognosis. This narrative review aims to summarize knowledge regarding the mechanisms mediating the effect of Lp(a) on inflammation, atherosclerosis and thrombosis and discuss current diagnostic and therapeutic potentials.

29 September 2023 in Life
Verified
Journal Article
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MKMaria Katsioupa
Maria Katsioupa
IKIslam Kourampi
Islam Kourampi
EVANGELOS OIKONOMOUEVANGELOS OIKONOMOU
EVANGELOS OIKONOMOU
VTVasiliki Tsigkou
Vasiliki Tsigkou
PTPanagiotis Theofilis
Panagiotis Theofilis
Dimitris TousoulisDimitris Tousoulis
Dimitris Tousoulis
The burden of cardiovascular diseases and the critical role of acute coronary syndrome (ACS) in their progression underscore the need for effective diagnostic and prognostic tools. Biomarkers have emerged as crucial instruments for ACS diagnosis, risk stratification, and prognosis assessment. Among these, high-sensitivity troponin (hs-cTn) has revolutionized ACS diagnosis due to its superior sensitivity and negative predictive value. However, challenges regarding specificity, standardization, and interpretation persist. Beyond troponins, various biomarkers reflecting myocardial injury, neurohormonal activation, inflammation, thrombosis, and other pathways are being explored to refine ACS management. This review article comprehensively explores the landscape of clinically used biomarkers intricately involved in the pathophysiology, diagnosis, and prognosis of ACS (i.e., troponins, creatine kinase MB (CK-MB), B-type natriuretic peptides (BNP), copeptin, C-reactive protein (CRP), interleukin-6 (IL-6), d-dimers, fibrinogen), especially focusing on the prognostic role of natriuretic peptides and of inflammatory indices. Research data on novel biomarkers (i.e., endocan, galectin, soluble suppression of tumorigenicity (sST2), microRNAs (miRNAs), soluble oxidized low-density lipoprotein receptor-1 (sLOX-1), F2 isoprostanes, and growth differentiation factor 15 (GDF-15)) are further analyzed, aiming to shed light on the multiplicity of pathophysiologic mechanisms implicated in the evolution of ACS. By elucidating the complex interplay of these biomarkers in ACS pathophysiology, diagnosis, and outcomes, this review aims to enhance our understanding of the evolving trajectory and advancements in ACS management. However, further research is necessary to establish the clinical utility and integration of these biomarkers into routine practice to improve patient outcomes.

Verified
Journal Article
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VTVasiliki Tsigkou
Vasiliki Tsigkou
EVANGELOS OIKONOMOUEVANGELOS OIKONOMOU
EVANGELOS OIKONOMOU
AAArtemis Anastasiou
Artemis Anastasiou
Stamatios LampsasStamatios Lampsas
Stamatios Lampsas
George E. ZakynthinosGeorge E. Zakynthinos
George E. Zakynthinos
GSGerasimos Siasos
Gerasimos Siasos
Heart failure is a complex medical syndrome that is attributed to a number of risk factors; nevertheless, its clinical presentation is quite similar among the different etiologies. Heart failure displays a rapidly increasing prevalence due to the aging of the population and the success of medical treatment and devices. The pathophysiology of heart failure comprises several mechanisms, such as activation of neurohormonal systems, oxidative stress, dysfunctional calcium handling, impaired energy utilization, mitochondrial dysfunction, and inflammation, which are also implicated in the development of endothelial dysfunction. Heart failure with reduced ejection fraction is usually the result of myocardial loss, which progressively ends in myocardial remodeling. On the other hand, heart failure with preserved ejection fraction is common in patients with comorbidities such as diabetes mellitus, obesity, and hypertension, which trigger the creation of a micro-environment of chronic, ongoing inflammation. Interestingly, endothelial dysfunction of both peripheral vessels and coronary epicardial vessels and microcirculation is a common characteristic of both categories of heart failure and has been associated with worse cardiovascular outcomes. Indeed, exercise training and several heart failure drug categories display favorable effects against endothelial dysfunction apart from their established direct myocardial benefit.

4 February 2025 in Journal of Clinical Medicine
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George E. ZakynthinosGeorge E. Zakynthinos
George E. Zakynthinos
GGGrigorios Giamouzis
Grigorios Giamouzis
Andrew XanthopoulosAndrew Xanthopoulos
Andrew Xanthopoulos
EVANGELOS OIKONOMOUEVANGELOS OIKONOMOU
EVANGELOS OIKONOMOU
KKKonstantinos Kalogeras
Konstantinos Kalogeras
VTVASILIKI TSOLAKI
VASILIKI TSOLAKI
Sepsis is a systemic inflammatory response syndrome of suspected or confirmed infectious origin, which frequently culminates in multiorgan failure, including cardiac involvement. Septic cardiomyopathy (SCM) remains a poorly defined clinical entity, lacking a formal or consensus definition and representing a significant knowledge gap in critical care medicine. It is an often-underdiagnosed complication of sepsis. The only widely accepted aspect of its definition is that SCM is a transient myocardial dysfunction occurring in patients with sepsis, which cannot be attributed to ischemia or pre-existing cardiac disease. The pathogenesis of SCM appears to be multifactorial, involving inflammatory cytokines, overproduction of nitric oxide, mitochondrial dysfunction, calcium homeostasis dysregulation, autonomic imbalance, and myocardial edema. Diagnosis primarily relies on echocardiography, with advanced tools such as tissue Doppler imaging (TDI) and global longitudinal strain (GLS) providing greater sensitivity for detecting subclinical dysfunction and guiding therapeutic decisions. Traditional echocardiographic findings, such as left ventricular ejection fraction measured by 2D echocardiography, often reflect systemic vasoplegia rather than intrinsic myocardial dysfunction, complicating accurate diagnosis. Right ventricular (RV) dysfunction, identified as a critical component of SCM in many studies, has multifactorial pathophysiology. Factors including septic cardiomyopathy itself, mechanical ventilation, hypoxemia, and hypercapnia—particularly in cases complicated by acute respiratory distress syndrome (ARDS)—increase RV afterload and exacerbate RV dysfunction. The prognostic value of cardiac biomarkers, such as troponins and natriuretic peptides, remains uncertain, as these markers primarily reflect illness severity rather than being specific to SCM. Treatment focuses on the early recognition of sepsis, hemodynamic optimization, and etiological interventions, as no targeted therapies currently exist. Emerging therapies, such as levosimendan and VA-ECMO, show potential in severe SCM cases, though further validation is needed. The lack of standardized diagnostic criteria, combined with the heterogeneity of sepsis presentations, poses significant challenges to the effective management of SCM. Future research should focus on developing cluster-based classification systems for septic shock patients by integrating biomarkers, echocardiographic findings, and clinical parameters. These advancements could clarify the underlying pathophysiology and enable tailored therapeutic strategies to improve outcomes for SCM patients.

7 November 2022 in Life
Verified
Journal Article
Open access
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EVANGELOS OIKONOMOUEVANGELOS OIKONOMOU
EVANGELOS OIKONOMOU
PTPanagiotis Theofilis
Panagiotis Theofilis
Stamatios LampsasStamatios Lampsas
Stamatios Lampsas
OKOurania Katsarou
Ourania Katsarou
KKKonstantinos Kalogeras
Konstantinos Kalogeras
GSGerasimos Siasos
Gerasimos Siasos
Over the last decades, significant advances have been achieved in the treatment of coronary artery disease (CAD). Proper non-invasive diagnosis and appropriate management based on functional information and the extension of ischemia or viability remain the cornerstone in the fight against adverse CAD events. Stress echocardiography and single photon emission computed tomography are often used for the evaluation of ischemia. Advancements in non-invasive imaging modalities such as computed tomography (CT) coronary angiography and cardiac magnetic resonance imaging (MRI) have not only allowed non-invasive imaging of coronary artery lumen but also provide additional functional information. Other characteristics regarding the plaque morphology can be further evaluated with the latest modalities achieving a morpho-functional evaluation of CAD. Advances in the utilization of positron emission tomography (PET), as well as software advancements especially regarding cardiac CT, may provide additional prognostic information to a more evidence-based treatment decision. Since the armamentarium on non-invasive imaging modalities has evolved, the knowledge of the capabilities and limitations of each imaging modality should be evaluated in a case-by-case basis to achieve the best diagnosis and treatment decision. In this review article, we present the most recent advances in the noninvasive anatomical and functional evaluation of CAD.

6 June 2023 in Journal of the American Heart Association
Verified
Journal Article
Open access
KKKonstantinos Kalogeras
Konstantinos Kalogeras
RJRichard J. Jabbour
Richard J. Jabbour
RPRadoslaw Pracon
Radoslaw Pracon
TKTito Kabir
Tito Kabir
JSJoanne Shannon
Joanne Shannon
VPVasileios Panoulas
Vasileios Panoulas
Background: No data currently exist comparing the contemporary iterations of balloon‐expandable (BE) Edwards SAPIEN 3/Ultra and the self‐expanding (SE) Medtronic Evolut PRO/R34 valves. The aim of the study was the comparison of these transcatheter heart valves with emphasis on patients with small aortic annulus. Methods and Results: In this retrospective registry, periprocedural outcomes and midterm all‐cause mortality were analyzed. A total of 1673 patients (917 SE versus 756 BE) were followed up for a median of 15 months. A total of 194 patients died (11.6%) during follow‐up. SE and BE groups showed similar survival at 1 (92.6% versus 90.6%) and 3 (80.3% versus 85.2%) years ( P log‐rank =0.136). Compared with the BE group, patients treated with the SE device had lower peak (16.3±8 mm Hg SE versus 21.9±8 mm Hg BE) and mean (8.8±5 mm Hg SE versus 11.5±5 mm Hg BE) gradients at discharge. Conversely, the BE group demonstrated lower rates of at least moderate paravalvular regurgitation postoperatively (5.6% versus 0.7% for SE and BE valves, respectively; P <0.001). In patients treated with small transcatheter heart valves (≤26 mm for SE and ≤23 mm for BE; N=284 for SE and N=260 for BE), survival was higher among patients treated with SE valves at both 1 (96.7% SE versus 92.1% BE) and 3 (91.8% SE versus 82.2% BE) years ( P log‐rank =0.042). In propensity‐matched patients treated with small transcatheter heart valve, there remained a trend for higher survival among the SE group at both 1 (97% SE versus 92.3% BE) and 3 years (91.8% SE versus 78.7% BE), P log‐rank =0.096). Conclusions: Real‐world comparison of the latest‐generation SE and BE devices demonstrated similar survival up to 3 years’ follow‐up. In patients with small transcatheter heart valves, there may be a trend for improved survival among those treated with SE valves.