Ioannis S. Tzourtzos

Ioannis S. Tzourtzos

orcid
2nd Cardiology Department, University Hospital of Ioannina (...

Research Focus & Metrics

Academic Career Length

3Years (2024-Present)

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

Representative Publications

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30 November 2025 in Microorganisms
Verified
Journal Article
Open access
PDF file
DLDiamantina Lymperatou
Diamantina Lymperatou
RKRevekka Konstantopoulou
Revekka Konstantopoulou
MMMichalis Mentsis
Michalis Mentsis
Natalia AtzemoglouNatalia Atzemoglou
Natalia Atzemoglou
CDChristina Diamanti
Christina Diamanti
ECEirini Christaki
Eirini Christaki
Antimicrobial resistance (AMR) poses a critical global health threat. Wastewater surveillance has recently emerged as a valuable public health tool for monitoring AMR in communities and healthcare settings. This narrative review comprehensively examines the role of hospital wastewater surveillance (HWWS) in monitoring antimicrobial resistance. Methods to detect resistant bacteria and antimicrobial resistance genes (ARGs) in wastewater systems, ranging from culture-based techniques to advanced molecular approaches, including polymerase chain reaction (PCR) and next-generation sequencing (NGS), are explored. The review synthesizes data on key antimicrobial resistance genes commonly detected in hospital effluents and explores how HWWS contributes to understanding the dynamics of resistance within healthcare settings. Furthermore, it identifies methodological challenges and inconsistencies in data reporting and outlines necessary standardization steps to enhance the effectiveness of HWWS programs. Opportunities for integrating HWWS with clinical and public health frameworks are presented, emphasizing the need for robust metadata and transparent reporting. This review provides a comprehensive approach to HWWS strategies, which could complement robust infection control and antibiotic stewardship interventions to combat AMR.

5 March 2025 in Biomolecules
Verified
Journal Article
Open access
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CBChristos E. Ballas
Christos E. Ballas
CKChristos S Katsouras
Christos S Katsouras
CTChristos Tourmousoglou
Christos Tourmousoglou
KSKonstantinos C. Siaravas
Konstantinos C. Siaravas
Ioannis S. TzourtzosIoannis S. Tzourtzos
Ioannis S. Tzourtzos
CACHRISTOS ALEXIOU
CHRISTOS ALEXIOU
Postoperative atrial fibrillation (POAF) is the most common arrhythmia following cardiac surgery. This review critically explores the interplay between cardiopulmonary bypass (CPB) and aortic cross-clamping (ACC) times in POAF development. CPB disrupts systemic homeostasis by inducing inflammatory cascades, oxidative stress, and ischemia–reperfusion injury. Prolonged ACC times further exacerbate myocardial ischemia and structural remodeling, with durations exceeding 60–75 min consistently linked to an increased POAF risk. However, variability in outcomes across studies reveals the complex, multifactorial nature of POAF pathogenesis. Patient-specific variables, such as baseline comorbidities and myocardial protection strategies, modulate these risks, emphasizing the need for personalized surgical approaches. Despite advancements in myocardial protection techniques and anti-inflammatory strategies, the incidence of POAF remains persistently high, indicating a gap in translating mechanistic insights into effective interventions. Emerging biomarkers, including microRNAs (e.g., miR-21, miR-483-5p, etc.) and markers of myocardial injury like troponin I, offer potential for enhanced risk stratification and targeted prevention. However, their clinical applicability requires further validation in diverse patient populations. This review underscores the critical need for integrative research that combines clinical, molecular, and procedural variables to elucidate the nuanced interplay of factors driving POAF. Future directions include leveraging advanced intraoperative monitoring tools, refining thresholds for CPB and ACC times, and developing individualized perioperative protocols.

27 September 2024 in Medicina
Verified
Journal Article
Open access
PDF file
Ioannis S. TzourtzosIoannis S. Tzourtzos
Ioannis S. Tzourtzos
LLLampros Lakkas
Lampros Lakkas
CKChristos S Katsouras
Christos S Katsouras
Pulmonary embolism (PE) is correlated with serious morbidity and mortality. Efforts have been made to establish and validate mortality predictive scores based mainly on clinical parameters. Patients with PE and traditional indices of echocardiographic right ventricular (RV) dysfunction or pressure overload have a higher probability of a worse outcome. During the last two decades, studies regarding the use of two-dimensional speckle-tracking echocardiography (2DSTE) and its derived indices in the setting of acute PE have been conducted. In this comprehensive review of the literature, we aimed to summarize these studies. Safe conclusions and comparisons among the reviewed studies are prone to statistical errors, mainly because the studies published were heterogenous in design, different 2DSTE-derived parameters were tested, and different clinical outcomes were used as endpoints. Nonetheless, RV strain indices and, more commonly, regional longitudinal strain of the RV free wall have shown a promising correlation with mortality, assisting in the differential diagnosis between PE and other acute or chronic disorders.

5 February 2025 in Cancers
Verified
Journal Article
Open access
PDF file
KSKonstantinos C. Siaravas
Konstantinos C. Siaravas
AMAmalia Ioanna Moula
Amalia Ioanna Moula
Ioannis S. TzourtzosIoannis S. Tzourtzos
Ioannis S. Tzourtzos
CBChristos E. Ballas
Christos E. Ballas
CKChristos S Katsouras
Christos S Katsouras
Background/Objectives: Patients with acute myeloid leukemia (AML) have a higher propensity for adverse cardiovascular outcomes, primarily due to the toxic effects of chemotherapeutic agents. The purpose of this systematic review is to explore the association of acute myeloid leukemia treatment with adverse cardiovascular events. Methods: We systematically screened the literature for studies providing comparative data on cardiovascular toxicities in patients treated for acute myeloid leukemia. After the initial search, 3649 papers were screened and a final total number of 46 were included for the review process. Results: Common chemotherapeutic agents used in AML may cause cardiovascular (CV) toxicities. A plethora of pathophysiological mechanisms are incriminated for these effects. Drug combinations may increase the risk in a synergistic way. In addition, common mutations of AML, personal history of previous cardiovascular disease and impaired heart function carry an increased complication risk. Biomarkers, as well as multimodality imaging, may be used for the early detection of cardiovascular toxicities. Conclusions: Increased risks of CV toxicity and comorbidities are observed among AML patients. With all the available diagnostic modalities, early detection and CV prevention strategies can improve the patient’s prognosis and quality of life.

Verified
Journal Article
Open access
PDF file
CBChristos E. Ballas
Christos E. Ballas
CKChristos S Katsouras
Christos S Katsouras
KSKonstantinos C. Siaravas
Konstantinos C. Siaravas
Ioannis S. TzourtzosIoannis S. Tzourtzos
Ioannis S. Tzourtzos
AMAmalia Ioanna Moula
Amalia Ioanna Moula
CACHRISTOS ALEXIOU
CHRISTOS ALEXIOU
This review explores the advantages of ivabradine in the management of cardiac surgery patients, particularly highlighting its heart rate (HR)-reducing properties, its role in minimizing the impact of atrial fibrillation, and its contributions to improving left ventricular diastolic function, as well as reducing pain, stress, and anxiety. In parallel, studies provide evidence that ivabradine influences endothelial inflammatory responses through mechanisms such as biomechanical modulation. Unlike traditional beta-blockers that may induce hypotension, ivabradine selectively inhibits hyperpolarization-activated cyclic nucleotide-gated (HCN) channels, allowing for effective HR reduction without compromising blood pressure stability. This characteristic is particularly beneficial for patients at risk of atrial fibrillation post-surgery, where HR control is crucial for cardiovascular stability. This is an area in which ivabradine appears to play a role prophylactically, possibly in combination with beta-blockers. Furthermore, ivabradine has been associated with enhanced diastolic parameters in left ventricular function, reflecting its potential to improve surgical outcomes in patients with compromised heart function. In addition to its cardiovascular benefits, it appears to alleviate psychological stress and anxiety, common in postoperative settings, by moderating the neuroendocrine response to stress, thereby reducing stress-induced hormone levels. Furthermore, it has notable analgesic properties, contributing to pain management through its action on HCN channels in both the peripheral and central nervous systems. Collectively, these findings indicate that ivabradine may serve as a valuable therapeutic agent in the perioperative care of cardiac surgery patients, addressing both physiological and psychological challenges during recovery.

Verified
Journal Article
Open access
PDF file
ARAidonis Rammos
Aidonis Rammos
CFChristos Floros
Christos Floros
Ioannis S. TzourtzosIoannis S. Tzourtzos
Ioannis S. Tzourtzos
ISIlektra I Stamou
Ilektra I Stamou
PKPetros Kalogeras Kalogeras
Petros Kalogeras Kalogeras
LMLampros Michalis
Lampros Michalis
Cardiogenic shock (CS) is a heterogeneous pathophysiological state with high mortality, despite the development of cardiac intensive care units (CICUs) and the advanced treatments applied. The cornerstones of therapy that have been proposed in many algorithms are intravenous (i.v.) pressors and devices for mechanical circulatory support (MCS), depending on the CS profile (left, right, or biventricular involvement), etiology (acute myocardial infarction, heart failure, or other) and SCAI stage (A to E, with MCS generally recommended for Stages C–E). There are many gaps in the evidence regarding i.v. medications and devices, with the existing data being controversial. Moreover, there are differences in the devices’ availability and, as a result, a lack of experience in many centers. In this review article, an algorithm for the management of CS is proposed, and the gaps in every step are presented. Early clinical suspicion that leads to prompt diagnosis, health system organization, large-scale trials, and the configuration of national or regional shock centers could bridge the current therapeutic gaps and balance disparities in the management of CS in order to improve outcomes.