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  • Title: Resistance to blockade by saralasin of effect of ACE inhibitors in conscious sodium-restricted dog.
    Author: Zimmerman BG, Goering JL, Raich PC.
    Journal: Am J Physiol; 1988 Nov; 255(5 Pt 2):F944-52. PubMed ID: 2847552.
    Abstract:
    Comparison of the effect of captopril and enalaprilat was made on mean systemic arterial blood pressure (BP), renal blood flow (RBF), and renal vascular resistance (RVR) of conscious sodium-replete and sodium-restricted dogs (plasma renin activity = 6.66 ng angiotensin I.ml-1.h-1). BP was decreased by -8 +/- 2 mmHg and RBF was increased by 34 +/- 12 ml/min with captopril given intravenously and by -5 +/- 2 mmHg and 28 +/- 7 ml/min with enalaprilat in sodium-replete dogs. The respective changes in BP and RBF in sodium-restricted dogs were -29 +/- 2 mmHg and 62 +/- 12 ml/min with captopril and -25 +/- 6 mmHg and 53 +/- 18 ml/min with enalaprilat. Saralasin infused intra-arterially to the kidney significantly blocked the increase in RBF seen after angiotensin-converting enzyme (ACE) inhibition in sodium-replete dogs, and reduced the increase in RBF in sodium-restricted dogs, but the latter effect was not statistically significant. A more moderate increase in plasma renin activity was established in another group of sodium-restricted dogs, and saralasin was administered intravenously instead of intra-arterially. Enalaprilat increased RBF in these dogs in the presence of a saralasin blockade (42 +/- 7 ml/min), and this effect was not significantly changed by prior administration of indomethacin (28 +/- 6 ml/min). The results suggest that blockade of the influence of the renin-angiotensin system and possibly another vasodilator mechanism, such as kinin potentiation, account for the increase in RBF after ACE inhibition in the low-sodium state.
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