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Glomerular hyperfiltration in essential hypertension: hormonal aspects.

G Regolisti1, C Buzio, A Cavatorta

  • 1Istituto di Clinica Medica e Nefrologia, Università degli Studi, Parma.

Acta Bio-Medica De L'Ateneo Parmense : Organo Della Societa Di Medicina E Scienze Naturali Di Parma
|January 1, 1992
PubMed
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Essential hypertension patients showed blunted renal functional reserve. Nifedipine enhanced protein-induced hyperfiltration, while enalapril reduced it, suggesting drug-specific effects on kidney hemodynamics.

Area of Science:

  • Nephrology
  • Cardiovascular Medicine
  • Pharmacology

Background:

  • Glomerular hyperfiltration contributes to renal damage in essential hypertension.
  • The impact of antihypertensive drugs on renal functional reserve in hypertension is not fully understood.

Purpose of the Study:

  • To assess renal functional reserve in essential hypertensive patients without renal impairment.
  • To investigate the effects of nifedipine and enalapril on renal hemodynamics and hormonal changes after an oral protein load.

Main Methods:

  • Measured renal hemodynamic parameters, plasma renin activity, aldosterone, and atrial natriuretic factor in 14 hypertensive patients.
  • Administered an acute oral protein load alone, with nifedipine, or with enalapril, compared to a carbohydrate meal.

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Main Results:

  • An oral protein load alone caused insignificant increases in glomerular filtration rate and renal plasma flow.
  • Nifedipine with protein load significantly increased glomerular filtration rate and renal plasma flow.
  • Enalapril with protein load decreased glomerular filtration rate and renal plasma flow.

Conclusions:

  • Renal functional reserve was blunted in essential hypertensive patients.
  • Nifedipine enhanced protein-induced hyperfiltration, while enalapril abolished it.
  • Hormonal changes did not appear to be the primary drivers of observed hemodynamic effects.