Chapter 9: Hypertension Management

Blood pressure regulation involves a complex interplay of physiological mechanisms that maintain cardiovascular homeostasis through the interaction of cardiac output and systemic vascular resistance. The autonomic nervous system continuously monitors blood pressure changes through baroreceptors and chemoreceptors, triggering adjustments in heart rate, contractility, and vascular tone via sympathetic and parasympathetic pathways. The renal and endocrine systems contribute to long-term pressure regulation through the renin-angiotensin-aldosterone system, which promotes vasoconstriction and sodium-water retention, while the vascular endothelium modulates local resistance through release of vasodilators such as nitric oxide and vasoconstrictors like endothelin-1. Hypertension, defined as sustained systolic pressure of 140 mm Hg or greater or diastolic pressure of 90 mm Hg or greater, is classified as either primary, which accounts for the majority of cases and stems from genetic, environmental, and demographic factors, or secondary, which results from identifiable causes including renal disease, primary aldosteronism, sleep apnea, and oral contraceptive use. Untreated hypertension leads to progressive target organ damage affecting the heart, brain, kidneys, and eyes, manifesting as left ventricular hypertrophy, stroke, nephropathy, and retinopathy. Diagnosis requires multiple properly measured readings across separate visits rather than single measurements. Management prioritizes prevention of end-organ complications through lifestyle modifications including weight reduction, sodium restriction using dietary approaches such as the DASH protocol, alcohol moderation, and regular physical activity, supplemented when necessary by pharmacological intervention with agents such as diuretics, beta-blockers, calcium channel blockers, ACE inhibitors, and angiotensin II receptor blockers. Treatment decisions must account for patient age, race, comorbidities, and special circumstances such as pregnancy or chronic kidney disease. Nursing responsibilities encompass comprehensive assessment, continuous hemodynamic monitoring, patient education regarding medication adherence and lifestyle changes, and facilitation of self-monitoring practices to achieve sustained blood pressure control and prevent cardiovascular complications.