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Topic Review
Cardiotoxic Effects of Immune Checkpoint Inhibitor Therapies
Cardiotoxicity ranges from arrhythmias to life-threatening myocarditis with very high mortality rates. To date, most treatments of  Immune Checkpoint Inhibitor (ICI) cardiotoxicity include immune suppression, which is also not cardiac-specific and may result in hampering of tumor clearance. 
  • 614
  • 19 Apr 2022
Topic Review
Collagen fibers in Mitral Valve
Collagen fibers are essential structural components of mitral valve leaflets, their tension apparatus (chordae tendineae), and the associated papillary muscles. Excess or lack of collagen fibers in the extracellular matrix (ECM) in any of these structures can adversely affect mitral valve function. The organization of collagen fibers provides a sophisticated framework that allows for unidirectional blood flow during the precise opening and closing of this vital heart valve. Although numerous ECM molecules are essential for the differentiation, growth, and homeostasis of the mitral valve (e.g., elastic fibers, glycoproteins, and glycans), collagen fibers are key to mitral valve integrity. Besides the inert structural components of the tissues, collagen fibers are dynamic structures that drive outside-to-inside cell signaling, which informs valvular interstitial cells (VICs) present within the tissue environment.
  • 613
  • 01 Sep 2021
Topic Review
Dyslipidemia
Dyslipidemia is a significant threat to public health worldwide and the identification of its pathogenic mechanisms, as well as novel lipid-lowering agents, are warranted. Magnesium (Mg) is a key element to human health and its deficiency has been linked to the development of lipid abnormalities and related disorders, such as the metabolic syndrome, type 2 diabetes mellitus, or cardiovascular disease.
  • 611
  • 07 May 2021
Topic Review
Constraints in Clinical Cardiology
The integration of genetic and molecular components of a disease produces interacting networks, modules and phenotypes with clinical applications in complex cardiovascular entities. With the holistic principle of systems biology, some of the features of complexity and natural progression of cardiac diseases are approached and explained. Two important interrelated holistic concepts of systems biology are described; the emerging field of personalized medicine and the constraint-based thinking with downward causation. Constraints in cardiovascular diseases embrace three scientific fields related to clinical cardiology: biological and medical constraints; constraints due to limitations of current technology; and constraints of general resources for better medical coverage. Systems healthcare and personalized medicine are connected to the related scientific fields of: ethics and legal status; data integration; taxonomic revisions; policy decisions; and organization of human genomic data. 
  • 611
  • 27 May 2021
Topic Review
Induced Cardiomyocyte Proliferation
Spontaneous cardiomyocyte regeneration has been demonstrated in embryonic and neonatal mammals after genetic ablation, apical resection, or myocardial infarction. Adult cardiomyocyte proliferation and turnover have been reported to be minimal in human heartsand rodents. Cardiomyocyte division was also demonstrated to occur at a very low rate after acute and chronic infarction in humans.
  • 611
  • 13 Sep 2021
Topic Review
The Popeye Domain Containing Gene Family
The Popeye domain containing (POPDC) genes encode a novel class of  3',5'-cyclic adenosine monophosphate (cAMP) effector proteins, which are localized to the plasma membrane. Mutations of POPDC genes have been associated with cardiac and skeletal muscle disease. However POPDC genes also play a role as tumor suppressor by interacting with proteins involved in cell migration, cell signaling and cell cycle control.
  • 611
  • 08 Dec 2021
Topic Review
Biomechanical Properties of Ascending Aorta
Ascending thoracic aortic aneurysm is a life-threatening disease, which is difficult to detect prior to the occurrence of a catastrophe. Epidemiology patterns of ascending thoracic aortic dilations/aneurysms remain understudied, whereas the risk assessment of it may be improved. 
  • 610
  • 24 Oct 2022
Topic Review
Eptifibatide
Eptifibatide is a glycoprotein IIb/IIIa inhibitor that blocks different pathways in platelet activation and aggregation.
  • 610
  • 11 Apr 2023
Topic Review
Fractalkine in Cardiovascular Disease
Fractalkine (FKN, CX3CL1) is a unique chemokine, present as a transmembrane protein on the endothelium, or following cleavage as a soluble ligand, attracting leukocyte subsets expressing the corresponding receptor CX3CR1.  Fractalkine receptor CX3CR1 is associated with microvascular obstruction (MVO) in patients undergoing primary PCI. Moreover, inhibition of CX3CR1 with an allosteric small molecule antagonist (KAND567) in the rat MI model reduces acute infarct size, inflammation, and intramyocardial haemorrhage (IMH). 
  • 610
  • 03 Aug 2023
Topic Review
The Electrocardiogram in Reflex Syncope
The baseline electrocardiogram (ECG) is less informative in neurally mediated syncope (NMS) than in arrhythmic syncope. However, some of the ECG patterns present in NMS can have diagnostic and prognostic value in such patients. This work reviews known ECG findings related to the cardioinhibitory reflex, as well as recently studied ECG patterns present in patients with NMS, such as the isolated very low QRS voltage.
  • 608
  • 26 Aug 2021
Topic Review
Pulmonary Atresia with Ventricular Septal Defect
Pulmonary atresia with ventricular septal defect (PA/VSD) is the extreme form of Fallot's tetralogy in which pulmonary blood flow is ensured from systemic blood flow sources. In the presence of Major Aorto-Pulmonary Collateral Arteries (MAPCAs), the disease assumes the greatest complexity due to the variable pulmonary perfusion patterns, of which MAPCAs are an important, although not the only source. True pulmonary arteries may have varying degrees of hypoplasia, be absent and, more rarely, discontinuous, with unilateral pulmonary perfusion provided by the arterial duct and contralateral by MAPCAs. The variability of the pulmonary perfusion pattern is a determining factor in the complexity of patients with PA/VSD/MAPCAs and the consequent diversity of their surgical management.
  • 608
  • 12 Apr 2022
Topic Review
Epigenetics in LMNA-Related Cardiomyopathy
Mutations in the gene for lamin A/C (LMNA) cause a diverse range of diseases known as laminopathies. LMNA-related cardiomyopathy is a common inherited heart disease and is highly penetrant with a poor prognosis. Numerous investigations using mouse models, stem cell technologies, and patient samples have characterized the phenotypic diversity caused by specific LMNA variants and contributed to understanding the molecular mechanisms underlying the pathogenesis of heart disease. As a component of the nuclear envelope, LMNA regulates nuclear mechanostability and function, chromatin organization, and gene transcription.
  • 608
  • 23 Mar 2023
Topic Review
Cardiac Sarcoidosis
Cardiac sarcoidosis (CS) is an unusual, but potentially harmful, manifestation of systemic sarcoidosis (SA), a chronic disease characterized by organ involvement from noncaseating and nonnecrotizing granulomas. Lungs and intrathoracic lymph nodes are usually the sites that are most frequently affected, but no organ is spared and CS can affect a variable portion of SA patients, up to 25% from post-mortem studies. The cardiovascular involvement is usually associated with a bad prognosis and is responsible for the major cause of death and complications, particularly in African American patients. Furthermore, the diagnosis is often complicated by the occurrence of non-specific clinical manifestations, which can mimic the effect of more common heart disorders, and imaging and biopsies are the most valid approach to avoid misdiagnosis.
  • 607
  • 31 May 2021
Topic Review
Micro-CT in Pulmonary Diseases Diagnosis
Micro-computed tomography (micro-CT) is a promising novel medical imaging modality that allows for non-destructive volumetric imaging of surgical tissue specimens at high spatial resolution. 
  • 607
  • 02 Nov 2022
Topic Review
MicroRNAs in Myocarditis
Myocarditis is an inflammatory disease of the heart with a viral infection as the most common cause. It affects most commonly young adults. Although endomyocardial biopsy and cardiac magnetic resonance are used in the diagnosis, neither of them demonstrates all the required qualities. There is a clear need for a non-invasive, generally available diagnostic tool that will still remain highly specific and sensitive. These requirements could be possibly met by microribonucleic acids (miRNAs), which are small, non-coding RNA molecules that regulate many fundamental cell functions. They can be isolated from cells, tissues, or body fluids. 
  • 607
  • 29 Dec 2022
Topic Review
Diagnostic Method for Cardiac Malposition
A significant number of patients with dextrocardia and other cardiac malpositions have other congenital heart defects (CHDs). The incidence of CHDs in subjects with cardiac malpositions is significantly greater than that in normal children, and the prevalence varies with the associated visceroatrial situs. The most useful approach to diagnosis is segmental analysis. Firstly, dextroposition should be excluded. In segmental analysis, the visceroatrial situs, ventricular location, status of atrioventricular connections, the great artery relationship, and conotruncal relationship are determined with the use of electrocardiogram (ECG), chest X-ray, and echocardiographic studies, and, when necessary, other imaging studies, including angiography. Following identification of the afore-mentioned segments, the associated defects in the atrial and ventricular septae, valvar and vascular stenosis or atresia may be determined by a review of the historical information, physical examination, and analysis of chest roentgenogram, ECG, and echocardiographic studies. Along the way, a pictorial rendition of the terminology and diagnosis of cardiac malpositions is undertaken.
  • 606
  • 30 Dec 2022
Topic Review
Extracellular Matrix in Heart Disease
Accumulating evidence indicates that two major proteins are responsible for the structural coherence of bounding cardiomyocytes. These biomolecules are known as myocardial fibrillar collagen type I (COL1) and type III (COL3). In addition, fibronectin, laminin, fibrillin, elastin, glycoproteins, and proteoglycans take part in the formation of cardiac extracellular matrix (ECM). In physiological conditions, collagen synthesis and degradation in human cardiac ECM are well-regulated processes, but they can be impaired in certain cardiovascular diseases, such as heart failure (HF). Myocardial remodeling is part of the central mechanism of HF and involves cardiomyocyte injury and cardiac fibrosis due to increased fibrillar collagen accumulation.
  • 605
  • 07 Apr 2022
Topic Review
Cardiotoxicity of Fluoropyrimidines
The definition of cardiotoxicity includes not only clinical symptoms but also changes in left ventricular ejection fraction or histopathological changes in cardiomyocytes. Cardiotoxicity is a rare but serious complication of cytostatic agents, defined as a negative impact on heart function or cardiac cells. Fluoropyrimidine cardiotoxicity was first described in 1969, and since then, many studies have confirmed these findings, but many details such as incidence, mechanisms, and treatment are unclear and remain disputed.
  • 604
  • 20 Oct 2021
Topic Review
Caval Valve Implantation for Tricuspid Regurgitation Treatment
Given the technical simplicity of the bicaval valve implantation (CAVI) technique compared to other transcatheter devices, CAVI is postulated as a suitable alternative for a wide variety of patients affected with severe+ tricuspid regurgitation.
  • 604
  • 15 Nov 2021
Topic Review
microRNAs in Acute Coronary Syndromes
microRNAs (miRs) are endogenous non-coding single-stranded RNAs of approximately 20 nucleotides in length that negatively regulate post-transcriptional gene functions. Acute coronary syndromes (ACS) is a result of the interplay between coronary artery in situ thrombus formation, vulnerable plaque features such as a lipid or a necrotic core, myocardial necrosis followed by fibrosis. 
  • 604
  • 29 Nov 2022
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