Sympathetic overactivity in hypertension. A moving target

Area of Science:

• Cardiovascular Science
• Neuroscience
• Metabolic Science

Background:

• The nervous system significantly influences human hypertension.
• Autonomic abnormalities, particularly excessive sympathetic activity, are evident early in hypertension and childhood.
• This sympathetic overactivity is linked to metabolic syndrome, insulin resistance, dyslipidemia, and coronary heart disease.

Purpose of the Study:

• To clarify the role of the nervous system in hypertension.
• To address misconceptions regarding the prognosis of neurogenic hypertension.
• To explain the hemodynamic transitions in hypertension.

Main Methods:

• Review of existing evidence on nervous system involvement in hypertension.
• Analysis of the relationship between sympathetic activity, metabolic syndrome, and cardiovascular outcomes.
• Examination of hemodynamic changes in neurogenic versus established hypertension.

Main Results:

• Excessive sympathetic activity is a consistent feature of hypertension, starting in childhood.
• Sympathetic overactivity contributes to hypertension, metabolic syndrome, and coronary heart disease.
• Neurogenic hypertension, contrary to popular belief, carries a high risk of accelerated hypertension and cardiovascular events.
• Hemodynamic changes evolve from increased cardiac output to high-resistance hypertension due to altered vascular and cardiac responsiveness.
• The central nervous system's "blood pressure seeking behavior" sustains elevated blood pressure even with decreased sympathetic tone in later stages.

Conclusions:

• The nervous system, particularly sympathetic overactivity, plays a critical role throughout the development and progression of hypertension.
• Misconceptions about neurogenic hypertension's benign prognosis are dangerous and unsupported by evidence.
• Understanding the central nervous system's role is crucial for managing hypertension and its associated risks.