ARTERIAL HYPERTENSION: PATHOPHYSIOLOGY, RISK FACTORS, AND PUBLIC HEALTH IMPLICATIONS

Аннотация

Arterial hypertension, or high blood pressure, is a leading cause of cardiovascular disease (CVD) worldwide, contributing significantly to morbidity and mortality. Despite medical advances, hypertension remains underdiagnosed and poorly controlled in many populations, leading to severe complications such as stroke, heart failure, and kidney disease. This thesis provides an in-depth analysis of the pathophysiology, epidemiology, and management strategies of arterial hypertension, with a particular focus on its public health implications. Through a comprehensive review of current research, this thesis emphasizes the critical need for improved prevention, diagnosis, and treatment strategies to reduce the global burden of hypertension. Keywords: Blood pressure, cardiac output (CO), systemic vascular resistance (SVR), Renin-Angiotensin-Aldosterone System (RAAS). 1: Introduction to Arterial Hypertension 1.1 Definition and Classification Arterial hypertension is defined as the persistent elevation of systemic arterial blood pressure. The American College of Cardiology (ACC) and American Heart Association (AHA) define hypertension as: Normal: Systolic BP < 120 mm Hg and Diastolic BP < 80 mm Hg Elevated: Systolic BP 120-129 mm Hg and Diastolic BP < 80 mm Hg Stage 1 Hypertension: Systolic BP 130-139 mm Hg or Diastolic BP 80-89 mm Hg Stage 2 Hypertension: Systolic BP ≥ 140 mm Hg or Diastolic BP ≥ 90 mm Hg 1.2 Global Burden and Significance Hypertension affects more than 1 billion people globally and is responsible for approximately 9.4 million deaths per year. It remains one of the most significant risk factors for cardiovascular morbidity and mortality, particularly in low- and middle-income countries where healthcare access is limited. The rising prevalence of hypertension is closely tied to demographic shifts, urbanization, dietary changes, and increased life expectancy. 2: Pathophysiology of Arterial Hypertension 2.1 Normal Blood Pressure Regulation Blood pressure is the result of cardiac output (CO) and systemic vascular resistance (SVR). Multiple systems, including the Renin-Angiotensin-Aldosterone System (RAAS), Sympathetic Nervous System (SNS), and the endothelium, tightly regulate BP: RAAS: Regulates blood volume and systemic vasoconstriction through aldosterone and angiotensin II, increasing BP. SNS: Stimulates vasoconstriction and increases heart rate, contributing to elevated BP. Endothelial Function: Controls vascular tone by releasing nitric oxide (NO) as a vasodilator and endothelin as a vasoconstrictor. 146 YOSH OLIMLAR ILMIY-AMALIY KONFERENSIYASI in-academy.uz/index.php/yo 2.2 Mechanisms of Hypertension Development Hypertension results from complex interactions between genetic, environmental, and physiological factors: Genetic Predisposition: Genetic variants affecting sodium handling, vascular function, and renal function contribute to hypertension. Renal Dysfunction: Impaired sodium excretion by the kidneys results in fluid retention, increasing blood volume and BP. Vascular Remodeling: Chronic hypertension causes arterial stiffness and increased peripheral resistance. Inflammation and Oxidative Stress: Prolonged inflammation and oxidative damage impair endothelial function, exacerbating BP elevation. 3: Epidemiology and Risk Factors 3.1 Global Trends in Hypertension Hypertension prevalence is highest in regions with rapid urbanization and economic growth, particularly in low- and middle-income countries. Increased dietary sodium, decreased physical activity, and higher rates of obesity contribute to this growing trend. In contrast, high- income countries have experienced a leftward shift in BP distribution due to better screening, prevention, and treatment. 3.2 Risk Factors for Hypertension Age: BP typically rises with age due to increased arterial stiffness and endothelial dysfunction. Obesity and Metabolic Syndrome: Excess body weight is a major contributor to elevated BP, primarily through increased blood volume, RAAS activation, and insulin resistance. Dietary Factors: High sodium intake and low potassium consumption are key dietary contributors to hypertension. Physical Inactivity: Sedentary lifestyles promote weight gain and negatively impact vascular health. Alcohol and Tobacco Use: Both excessive alcohol consumption and smoking are linked to higher BP and increased cardiovascular risk. 4: Clinical Consequences and Complications of Hypertension 4.1 Cardiovascular Complications Hypertension is a primary driver of cardiovascular morbidity and mortality: Stroke: Hypertension is the leading risk factor for both ischemic and hemorrhagic strokes. Coronary Artery Disease (CAD): Chronic hypertension accelerates atherosclerosis, increasing the risk of myocardial infarction. Heart Failure: Prolonged hypertension leads to left ventricular hypertrophy and subsequent heart failure, both with preserved and reduced ejection fraction. 4.2 Renal and Metabolic Complications Chronic Kidney Disease (CKD): Hyper