主题词：Nitric Oxide and Endothelin Effects; Cardiac electrophysiology and arrhythmias; Blood Pressure and Hypertension Studies; Receptor Mechanisms and Signaling; Renin-Angiotensin System Studies; Cardiac Ischemia and Reperfusion; Hormonal Regulation and Hypertension; Ion channel regulation and function; Heart Failure Treatment and Management; Heart Rate Variability and Autonomic Control; Cardiovascular Function and Risk Factors; Eicosanoids and Hypertension Pharmacology; Cardiac Imaging and Diagnostics; Cardiac Arrhythmias and Treatments; Atrial Fibrillation Management and Outcomes; Analytical Methods in Pharmaceuticals; Antiplatelet Therapy and Cardiovascular Diseases; Cardiac pacing and defibrillation studies; Neuropeptides and Animal Physiology; Cardiovascular and exercise physiology; Lipoproteins and Cardiovascular Health; Neuroscience and Neuropharmacology Research; Pulmonary Hypertension Research and Treatments; Cardiac Arrest and Resuscitation; Cardiac Fibrosis and Remodeling