Sympathetic nervous system and chronic renal failure

Area of Science:

• Nephrology
• Cardiology
• Neuroscience

Background:

• Chronic renal failure (CRF) is associated with significant cardiovascular complications.
• The sympathetic nervous system (SNS) plays a crucial role in cardiovascular regulation.
• Understanding SNS involvement in CRF is vital for improving patient prognosis.

Purpose of the Study:

• To review the evidence linking the sympathetic nervous system (SNS) to chronic renal failure (CRF).
• To discuss the roles of SNS in arterial hypertension, cardiovascular risk, and hemodialysis hypotension.

Main Methods:

• Literature review of studies investigating SNS activity in CRF.
• Analysis of evidence connecting kidney function, nervous signals, and blood pressure regulation.
• Examination of data on heart rate variability and mortality in CRF patients.
• Review of mechanisms underlying hypotension during hemodialysis.

Main Results:

• Evidence indicates sympathetic hyperactivity in CRF, linked to arterial hypertension.
• Diseased kidneys may send signals that sustain hypertension; nephrectomy can reduce blood pressure.
• Reduced heart rate variability in CRF suggests increased risk of all-cause and sudden death.
• Hemodialysis hypotension involves withdrawal of sympathetic activity, vasodilation, and bradycardia, potentially due to cardiac mechanoceptor activation or other factors.

Conclusions:

• Sympathetic hyperactivity is a key feature of CRF, contributing to hypertension and cardiovascular risk.
• Therapies targeting SNS modulation hold promise for improving quality of life and outcomes in CRF patients.