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Hypertension in primary glomerulonephritis without renal insufficiency
P Zucchelli1, A Zuccalà, E Mancini
1Divisione di Nefrologia e Dialisi, Policlinico S. Orsola-Malpighi, Bologna, Italy.
Summary
Hypertension in glomerulonephritis without kidney damage is not linked to sodium balance or autonomic nervous system issues. Some patients show elevated plasma renin activity (PRA), suggesting a specific mechanism in certain cases.
Area of Science:
- Nephrology
- Cardiovascular Physiology
- Endocrinology
Background:
- Hypertension frequently occurs in glomerulonephritis patients with preserved renal function.
- The underlying mechanisms driving hypertension in this context remain poorly understood.
Purpose of the Study:
- To investigate the pathogenesis of hypertension in glomerulonephritis without renal insufficiency.
- To explore the roles of the renin-angiotensin system, sodium balance, and autonomic nervous system.
Main Methods:
- Studied 85 glomerulonephritis patients (55 hypertensive) and 24 controls with normal renal function.
- Measured plasma renin activity (PRA), plasma noradrenaline, total exchangeable sodium, and urinary prostaglandin E (PGE).
- Assessed autonomic nervous system function using tilt, diving reflex, lying down, and deep-breathing tests.
Main Results:
- No significant differences in PRA, noradrenaline, sodium balance, urinary PGE, or autonomic function were found between hypertensive and normotensive glomerulonephritis patients, or compared to controls.
- Elevated PRA was observed in some normotensive glomerulonephritis patients, normalized by propranolol but not indomethacin.
Conclusions:
- Hypertension in glomerulonephritis without renal insufficiency is not associated with abnormalities in sodium balance, renin-angiotensin system, or autonomic nervous system function.
- Renin hypersecretion may contribute to hypertension in a subset of normotensive glomerulonephritis patients.