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Changes in renal autacoids in aged human hypertensives
A Ungar1, C Cristofari, M Torrini
1Dipartimento di Area Critica Medico Chirurgica, Università degli Studi di Firenze e Azienda Ospedaliera Careggi, Italy. aungar@unifit.it
Summary
Elderly kidneys with isolated systolic hypertension fail to adapt to stress, leading to renal damage. Antihypertensive treatment is crucial for preventing cardiovascular and kidney disease in these patients.
Area of Science:
- Nephrology
- Gerontology
- Cardiovascular Medicine
Background:
- Aging kidneys undergo modifications but remain functional in healthy individuals.
- Stress and adrenergic activation increase kidney vulnerability in the elderly, potentially causing renal failure.
- Hypertension accelerates age-related kidney changes, particularly affecting glomeruli.
Purpose of the Study:
- To investigate renal hemodynamic adaptation capacity in healthy elderly individuals and those with isolated systolic hypertension.
- To assess the impact of mental stress-induced adrenergic activation on renal hemodynamics in these groups.
Main Methods:
- Acute experiment involving mental stress to induce adrenergic activation.
- Comparison of renal hemodynamic responses between healthy elderly subjects and elderly patients with isolated systolic hypertension.
Main Results:
- Healthy elderly individuals exhibited prolonged, pronounced renal vasoconstriction in response to adrenergic activation.
- Elderly patients with isolated systolic hypertension showed a lack of renal adaptation, with passive renal vasodilation and glomerular hyperfiltration.
- Hypertensive elderly individuals demonstrated impaired paracrine response of renal vasculature, with no autacoid production variations during adrenergic activation.
Conclusions:
- Altered renal autoregulation in elderly patients with isolated systolic hypertension contributes to accelerated glomerulosclerosis and increased risk of renal damage and end-stage renal disease.
- Antihypertensive treatment of isolated systolic hypertension is vital for preventing cardiovascular mortality and renal complications.