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Renal function in the elderly: impact of hypertension and cardiac function
1Department of Internal Medicine, Ruperto-Carola University, Heidelberg, Germany.
Kidney International
|April 1, 1997
Summary
Renal function declines with age, but less than previously thought. Comorbidities like hypertension and heart failure significantly impact kidney function in older adults, affecting hemodynamics and sodium handling.
Area of Science:
- Nephrology
- Gerontology
- Physiology
Background:
- Renal function is widely believed to decline significantly with aging, even without disease.
- Age-related renal changes may be influenced by confounding factors such as hypertension and atherosclerosis.
Purpose of the Study:
- To comprehensively compare renal function across different elderly groups and young controls.
- To investigate the impact of aging, hypertension, and heart failure on renal hemodynamics and hormonal balance.
Main Methods:
- Compared glomerular filtration rate (GFR) and effective renal plasma flow (ERPF) in young, elderly normotensive, elderly hypertensive, and elderly heart failure patients.
- Assessed renovascular resistance, filtration fraction, fractional sodium excretion, lithium clearance, and hormonal levels (PTH, 25-(OH)D3).
Main Results:
- Elderly subjects showed lower GFR and ERPF than young subjects, with further reductions in hypertensive and heart failure groups.
- Renovascular resistance and filtration fraction were elevated in the elderly, especially with comorbidities.
- Altered sodium handling and hormonal imbalances (increased PTH, decreased vitamin D metabolites) were observed in the elderly.
Conclusions:
- Age-associated decline in renal hemodynamics is less severe than often reported, with comorbidities significantly confounding kidney function.
- Aging impacts renal hemodynamics, hormonal regulation, and sodium handling, necessitating careful consideration of comorbidities in elderly patients.