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  • Title: Relationship of antihypertensive effect of enalapril to serum MK-422 levels and angiotensin converting enzyme inhibition.
    Author: Johnston CI, Jackson B, McGrath B, Matthews G, Arnolda L.
    Journal: J Hypertens Suppl; 1983 Oct; 1(1):71-5. PubMed ID: 6100611.
    Abstract:
    In hypertensive patients the time courses for the rise in serum MK-422 level, and fall in both angiotensin converting enzyme (ACE) activity and blood pressure after 10 mg of enalapril were very similar. A close relationship between serum MK-422 levels and percentage ACE inhibition could be demonstrated and the acute fall in blood pressure showed a good correlation with either measurement. With chronic administration, serum MK-422 levels increased linearly with the dose of enalapril. As in the acute study, close relationships between the serum MK-422 level and ACE inhibition, and between either measurement and the fall in blood pressure, could be demonstrated after chronic enalapril administration. However, when compared to the acute response, the ACE inhibition dose-response line was shifted to the right after chronic enalapril therapy suggesting that enalapril may lead to ACE induction in humans. This did not appear to influence significantly the blood pressure lowering effect of enalapril or the relationship between ACE inhibition and the hypotensive effect.
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