Renal Response to Amino Acid Infusion in Essential Hypertension

• Published in: Hypertension (Dallas, Tex. 1979) Tex. 1979), 1994-01, Vol.23 (1 Suppl I), p.I-225-I-230
• Main Authors: Juncos, Luis, Cornejo, Juan Carlos, Pamies-Andreu, Encaraacion, Romero, Juan Carlos
• Format: Article
• Language: English
• Subjects: Adult; Aged; Aldosterone - blood; Amino Acids - administration & dosage; Amino Acids - pharmacology; Angiotensin II - blood; Biological and medical sciences; Blood Pressure - drug effects; Diastole - drug effects; Diet, Sodium-Restricted; Diseases of the cardiovascular system; Enalapril - pharmacology; Female; Glomerular Filtration Rate - drug effects; Humans; Hypertension - diet therapy; Hypertension - physiopathology; Infusions, Intravenous; Kidney - blood supply; Kidney - drug effects; Kidney - physiopathology; Male; Medical sciences; Middle Aged; Radiotherapy. Instrumental treatment. Physiotherapy. Reeducation. Rehabilitation, orthophony, crenotherapy. Diet therapy and various other treatments (general aspects); Regional Blood Flow - drug effects; Renin - blood; Sodium - urine; Systole - drug effects; Urine
• ISSN: 0194-911X; 1524-4563
• DOI: 10.1161/01.hyp.23.1_suppl.i225

In the present study, we evaluated the renal response to a 4-hour infusion of amino acids in essential hypertensive patients, as well as the effects that dietary sodium restriction and enalapril (a converting enzyme inhibitor) had on this renal response. During normal sodium intake, amino acid infusion significantly increased renal plasma flow from 383±58 to 478±51 mL/min and glomerular filtration rate from 82±8 to 100±13 mL/min. All these effects were abolished when the patients received a low sodium diet (40 mmol/d) for 3 days before the amino acid infusion. The administration of enalapril to the patients during sodium restriction restored the amino acid-induced increment in renal plasma flow (from 388±35 to 537±48 mL/min) and glomerular filtration rate (from 88±9 to 103±10 mL/min). Mean arterial pressure remained unaltered under all experimental conditions. The results show that in patients with essential hypertension dietary sodium restriction prevents amino acid-induced increments in glomerular filtration rate and renal plasma flow and that this effect is restored during the simultaneous administration of enalapril.