Publications by authors named "Rengin Cetin Guvenc"

Atrial septal defects (ASD) divert flow from systemic to pulmonary circulation, and some degree of plasma volume expansion and neurohormonal activation are necessary to maintain the effective circulatory volume. The aim of the present study was to understand the patterns of neurohormonal activation in ASD patients. 16 ASD patients and 10 controls were enrolled.

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Aims: Digoxin has been used in the treatment for heart failure for centuries, but the role of this drug in the modern era is controversial. A particular concern is the recent observational findings suggesting an increase in all-cause mortality with digoxin, although such observations suffer from biased results since these studies usually do not provide adequate compensation for the severity of disease. Using a nationwide registry database, we aimed to investigate whether digoxin is associated with 1-year all-cause mortality in patients with heart failure irrespective of phenotype.

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Background: Central Illustration: Usefulness of Age, Creatinine and Ejection Fraction - Modification of Diet in Renal Disease Score for Predicting Survival in Patients with Heart Failure Summary of the study design and key findings. ACEF: Age, creatinine and ejection fraction, MDRD: Modified Diet in Renal Disease. While many risk models have been developed to predict prognosis in heart failure (HF), these models are rarely useful for the clinical practitioner as they include multiple variables that might be time-consuming to obtain, they are usually difficult to calculate, and they may suffer from statistical overfitting.

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Objective: Coronavirus disease-2019 (COVID-19) is associated with atrial fibrillation (AF) and ventricular arrhythmias. Several electrophysiological abnormalities on surface electrocardiography (ECG) are associated with AF and ventricular arrhythmias, either as markers of abnormal interatrial conduction or abnormal repolarization. The present study sought to understand whether such ECG markers are more common in patients hospitalized with COVID-19 infection during the pandemic.

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Background: Congestion is the main cause of morbidity and a prime determinant of survival in patients with heart failure (HF). However, the assessment of congestion is subjective and estimation of plasma volume (ePV) has been suggested as a more objective measure of congestion. This study aimed to explore the relationships and interactions between ePV, the severity of congestion and survival using a nationwide registry.

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Hypochloremia has recently gained interest as a potential marker of outcomes in patients with heart failure (HF). The exact pathophysiologic mechanism linking hypochloremia to HF is unclear but is thought to be mediated by chloride-sensitive proteins and channels located in kidneys. This analysis aimed to understand whether renal dysfunction (RD) affects the association of hypochloremia with mortality in patients with HF.

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Manifest myocardial involvement is somewhat rare in patients with Behcet's disease (BD), although echocardiographic studies suggest that subclinical alterations in left ventricular (LV) contractility is rather common. Data on right ventricular (RV) involvement in BD is rather scarce. This study aims to determine whether RV systolic performance is affected in BD patients, and to understand the clinical and echocardiographic correlates of RV contractility in these patients.

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Objective: Predicting outcomes is an essential part of evaluation of patients with heart failure (HF). While there are multiple individual laboratory and imaging variables as well as risk scores available for this purpose, they are seldom useful during the initial evaluation. In this analysis, we aimed to elucidate the predictive usefulness of Thrombolysis in Myocardial Infarction Risk Index (TIMI-RI), a simple index calculated at the bedside with three commonly available variables, using data from a multicenter HF registry.

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Background: The accurate determination of low-density lipoprotein cholesterol (LDL-C) is important to reach guideline-recommended LDL-C concentrations and to reduce adverse cardiovascular outcomes in diabetic patients. The commonly used Friedewald equation (LDL-Cf), gives inaccurate results in diabetic patients due to accompanying diabetic dyslipidemia. Recently two new equations - Martin/Hopkins (LDL-Cmh) and Sampson (LDL-Cs) - were developed to improve the accuracy of LDL-C estimation, but data are insufficient to suggest the superiority of one equation over the other one.

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Presence of right heart failure (RHF) is associated with a worse prognosis in patients with left ventricular failure (LVF). While the cause of RHF secondary to LVF is multifactorial, an increased right ventricular (RV) afterload is believed as the major cause of RHF. However, data are scarce on the adaptive responses of the RV in patients with LVF.

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Background: Right ventricular failure (RVF) after left ventricular assist device (LVAD) implantation is a major cause of postoperative morbidity and mortality. Despite the availability of multiple imaging parameters, none of these parameters had adequate predictive accuracy for post-LVAD RVF.

Aim: To study whether right ventricular pressure-dimension index (PDI), which is a novel echocardiographic index that combines both morphologic and functional aspects of the right ventricle, is predictive of post-LVAD RVF and survival.

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Background: A history of preeclampsia (pPE) and gestational diabetes (pGDM) are female-specific risk markers for atherosclerosis and future cardiovascular risk. In addition to increasing the risk of established risk factors for atherosclerosis, such as hypertension or diabetes, evidence suggests that pregnancy-related complications can also directly accelerate atherosclerosis by inducing endothelial dysfunction. A combination of both conditions is seen in a subset of patients with pregnancy, though it is not known whether this combination increases the overall risk for cardiovascular events.

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Background: It is difficult to determine left ventricular systolic performance in patients with severe mitral regurgitation (MR) since left ventricular ejection fraction (EF) could be preserved until the end stages of the disease. Myocardial efficiency (MEf) describes the amount of external work (EW) done by the left ventricle per unit of oxygen consumed (mVO₂). In the present study, we aimed to investigate MEf in patients with asymptomatic severe MR using a novel echocardiographic method.

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Measurement of pulmonary venous flow (PVF) parameters can be used to estimate left ventricular end-diastolic pressure (LVEDP) on transthoracic echocardiography. Despite that, 2016 American Society of Echocardiography (ASE)/European Association of Cardiovascular Imaging (EACVI) algorithm gave a secondary role to PVF to assess left ventricular filling pressure. We aimed to test correlations between several PVF parameters, including novel measurements, with LVEDP and to analyze whether PVF parameters have an incremental usefulness over ASE/EACVI algorithm to estimate LVEDP.

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Background And Aims: Patients with inflammatory bowel disease (IBD) are at increased risk for coronary artery disease (CAD), even after adjusting for traditional risk factors for atherosclerosis. While inflammation is widely regarded as the pathophysiologic link between IBD and CAD, the exact mechanisms are largely unknown. This study was conducted to investigate the association of lipid parameters and indices with coronary flow reserve and markers of inflammation in IBD patients.

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Objective: Heart failure (HF) is a progressive clinical syndrome. SELFIE-TR is a registry illustrating the overall HF patient profile of Turkey. Herein, all-cause mortality (ACM) data during follow-up were provided.

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Background: Recent advances had allowed measurement of myocardial deformation parameters using 3D speckle-tracking echocardiography (STE). Agreement between these two modalities and interchangeability of findings remain as an issue since 2DSTE is more widely available than 3DSTE. The aim of this study was to investigate the correlation and agreement between 2DSTE and 3DSTE in healthy volunteers and in patients with mild mitral stenosis (MS).

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We retrospectively analyzed short- and long-term outcomes of patients who received bailout tirofiban during primary percutaneous intervention (pPCI). A total of 2681patients who underwent pPCI between 2009 and 2014 were analyzed; 1331 (49.6%) out of 2681 patients received bailout tirofiban.

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Background: Involvement of right-sided heart chambers (RSHCs) in patients infected with human immunodeficiency virus (HIV) is common and is usually attributed to pulmonary arterial or venous hypertension (PH). However, myocardial involvement in patients with HIV is also common and might affect RSHCs even in the absence of overt PH. Our aim was to define morphologic and functional alterations in RSHC in patients with HIV and without PH.

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Masses on the interatrial septum are usually caused by myxomas or thrombi within a patent foramen ovale. We report a 53-year-old male patient with a hollow mass within the left atrium that was incidentally found during a routine transthoracic echocardiography. Further investigation of the mass with transesophageal two- and three-dimensional echocardiography has revealed that the mass was a localized aneurysm of a patent foramen ovale tunnel.

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Ebstein's anomaly is a rare CHD that is characterised by caudal displacement of the functional tricuspid annulus and a dysfunctional tricuspid valve owing to a failure of proper leaflet coaptation. We present a balanced variant of Ebstein's anomaly, in which the overgrowth of the septal leaflet had allowed proper coaptation of the tricuspid leaflets, thus preserving the valve function.

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Artifacts are by-products of ultrasound imaging that may cause confusion or misdiagnosis if not interpreted correctly. There are, however, several disorders where a specific pattern of artifacts can aid in diagnosis, especially when the object in question cannot be visualized directly. In this manuscript, we report two patients with reverberation and shadow artifacts originating from the housing and the propeller of a continuous-flow intra-pericardial left ventricular assist device.

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In a fraction of patients with mild mitral stenosis, left ventricular systolic function deteriorates despite the lack of hemodynamic load imposed by the dysfunctioning valve. Neither the predisposing factors nor the earlier changes in left ventricular contractility were understood adequately. In the present study we aimed to evaluate left ventricular mechanics using three-dimensional (3D) speckle tracking echocardiography.

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Background: Cardiac cachexia and low serum albumin levels are poor prognostic signs in advanced heart failure, while overweight patients or patients who gain weight after treatment have more favourable outcomes. Weight gain following LVAD implantation is common, while the dynamic changes in body mass or serum proteins have not been studied adequately. Our aim was to study short-term changes in serum albumin, total protein and body weight following LVAD implantation and to compare these changes with heart failure patients treated medically.

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