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Published on: July 3, 2013
Hypertensive nephrosclerosis as a relevant cause of chronic renal failure
E R Caetano1, R Zatz, L B Saldanha
1Renal Division, Department of Clinical Medicine, University of São Paulo, São Paulo, Brazil.
Insights
Hypertensive nephrosclerosis (HN) is a significant cause of chronic kidney disease. However, some patients diagnosed with HN may actually have primary nephritis, highlighting the need for renal biopsy in diagnosis.
Area of Science:
- Nephrology
- Pathology
- Hypertension Research
Background:
- Hypertensive nephrosclerosis (HN) is often diagnosed clinically, but its definitive role in end-stage renal disease requires clarification.
- Understanding the histological spectrum of kidney damage in hypertensive patients with renal insufficiency is crucial for accurate diagnosis and management.
Purpose of the Study:
- To determine the histological findings in hypertensive patients with moderate renal insufficiency.
- To assess the prevalence of hypertensive nephrosclerosis (benign and malignant forms) versus other renal pathologies in this cohort.
Main Methods:
- Renal biopsy was performed on 81 hypertensive outpatients (BP >/=160/95 mm Hg) with moderate renal insufficiency.
- Exclusion criteria included known secondary causes of hypertension, systemic disorders, rheumatic disease, or nephrotic syndrome.
Main Results:
- Hypertensive nephrosclerosis was the sole histological abnormality in 65% of patients.
- Benign nephrosclerosis (BN) was present in 22%, and malignant nephrosclerosis (MN) in 43%.
- Undiagnosed primary nephritis (PN) was found in 16%, and focal and segmental glomerulosclerosis in 19%.
Conclusions:
- Hypertensive nephrosclerosis (both BN and MN) is a relevant cause of chronic renal insufficiency.
- A significant proportion of patients clinically diagnosed with HN may have underlying primary nephritis, underscoring the diagnostic value of renal biopsy.
Abstract:
It is currently unclear whether hypertensive nephrosclerosis (HN), usually diagnosed solely on clinical grounds, is a relevant cause of end-stage renal disease. We biopsied 81 hypertensive outpatients (blood pressure >/=160/95 mm Hg) with moderate renal insufficiency, who were referred to our service from 1988 to 1998. Patients with known causes of hypertension, systemic disorders, rheumatic disease, or nephrotic syndrome were excluded. In 65% of patients, HN was the sole histological abnormality associated with renal dysfunction. Benign nephrosclerosis (BN), defined as isolated arteriolar hyalinosis and/or intimal fibrosis, was found in 18 HN patients (22%), whereas malignant nephrosclerosis (MN), denoted mainly by myointimal cell proliferation, appeared in 35 HN patients (43%). Previously undiagnosed primary nephritis (PN) was found in 13 patients (16%), whereas focal and segmental glomerulosclerosis, which might be either primary or secondary to hypertension, appeared in 15 patients (19%). These findings suggest that HN, in both its BN and MN forms, can be a definite cause of chronic renal insufficiency and that a substantial fraction of patients with renal insufficiency and clinical diagnosis of HN may actually have PN.
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