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Sodium directly impairs target organ function in hypertension.
Edward D Frohlich1, Jasmina Varagic
1Ochsner Clinic Foundation, New Orleans, Louisiana 70121, USA. efrohlich@ochsner.org
Current Opinion in Cardiology
|August 12, 2005
Summary
Salt sensitivity in hypertension may manifest as impaired organ function, not just increased blood pressure. Studies show salt loading causes cardiac and renal damage, even with minimal arterial pressure rise.
Area of Science:
- Cardiovascular Research
- Nephrology
- Hypertension Pathophysiology
Background:
- Epidemiologic studies link increased salt intake to hypertension prevalence.
- Only a subset of individuals with essential hypertension exhibit salt sensitivity.
- This review explores an alternative hypothesis for salt sensitivity.
Purpose of the Study:
- To investigate if salt sensitivity is indicated by target organ dysfunction, not solely by elevated arterial pressure.
- To discuss the hypothesis that impaired organ structure and function can signify salt sensitivity.
Main Methods:
- Utilized the spontaneously hypertensive rat model, a relevant model for human hypertension.
- Examined the effects of salt loading on cardiac and renal structures and functions.
Main Results:
- Salt loading in spontaneously hypertensive rats induced left ventricular diastolic dysfunction.
- Impaired renal excretory function and massive proteinuria were observed following salt loading.
- These organ changes were associated with significant ischemia and fibrosis, with only a minor increase in arterial pressure.
Conclusions:
- Salt sensitivity may present as target organ damage (cardiac and renal) rather than solely a rise in blood pressure.
- Structural and functional changes in the heart and kidneys are precipitated by salt loading.
- Ischemia and fibrosis are key pathological features in salt-induced organ damage.