Adrenoceptors and Hypertension

Area of Science:

• Cardiovascular Medicine
• Nephrology
• Pharmacology

Background:

• Hypertension is a prevalent condition causing significant mortality and morbidity due to vascular and end-organ damage.
• Early hypertension stages, particularly in young men, involve hemodynamic alterations like increased cardiac output and peripheral resistance.
• Kidney damage from increased sodium reabsorption is a proposed initial trigger for essential hypertension.

Purpose of the Study:

• To review the pathophysiological mechanisms of hypertension, focusing on adrenoceptor stimulation and the renin-angiotensin-aldosterone system.
• To discuss the historical and current therapeutic roles of adrenoceptor antagonists and other antihypertensive agents.
• To highlight hypertension management in specific complex medical conditions.

Main Methods:

• Review of pathophysiological mechanisms including catecholamine effects on adrenoceptors and the renin-angiotensin-aldosterone system.
• Analysis of the therapeutic evolution of antihypertensive drugs, from early adrenoceptor blockers to current first-line agents.
• Examination of hypertension in specific conditions like pregnancy, phaeochromocytoma, and pulmonary arterial hypertension.

Main Results:

• Adrenoceptor stimulation (α1, β1) and renin-angiotensin-aldosterone system activation contribute to endothelial dysfunction and persistent hypertension.
• While initially used, α1 blockers, α2 agonists, and β blockers are no longer first-line due to outcome trial results.
• Angiotensin-converting enzyme inhibitors, angiotensin receptor blockers, calcium channel blockers, and thiazide-like diuretics are now considered first-line therapies.

Conclusions:

• Adrenoceptor agents remain relevant as second- or third-line therapy for hypertension.
• Understanding adrenoceptor roles is crucial for managing hypertension in various clinical contexts.
• This overview provides insights for clinicians and researchers on adrenoceptors in hypertension pathophysiology and treatment.