Physiological Mechanisms in Regulation of Blood Pressure Fast Frequency Variations

Abstract

Spectral analysis of blood pressure fast oscillations (short-term variability), both in humans and animals, reveals three major frequential domains: the very low-, low- and the high-frequency domain. In this paper, experimental data providing evidence for physiological mechanisms involved in the regulation of blood pressure oscillations such as sympathetic nervous system, renin-angiotensin system, NO, respiration, heart function, and circulating blood volume are reviewed. In addition, novel evidence is provided by the author for vasopressin modulation of the low- and high-frequency blood pressure components. This review suggests that the multiplicity of factors involved in the genesis of the blood pressure spectral components imply utmost caution in interpreting spectral results

Key Words:

• blood pressure
• spectrum analysis
• sympathicus
• renin-angiotensin
• NO
• respiration
• dehydration
• hemorrhage
• physostigmine
• vasopressin