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Methodologic problems in plasma renin activity measurements.

A Delorme, P T Guyene, P Corvol

    The American Journal of Medicine
    |November 1, 1976
    PubMed
    Summary
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    Optimizing plasma renin activity (PRA) measurement requires careful control of pH and angiotensinase inhibitors. Lower pH and specific inhibitors enhance PRA detection, particularly in hypertensive patients with low renin levels.

    Area of Science:

    • Biochemistry
    • Endocrinology
    • Clinical Chemistry

    Background:

    • Plasma renin activity (PRA) is a critical biomarker in hypertension management.
    • Accurate in vitro generation of angiotensin I is essential for reliable PRA measurements.
    • The influence of assay conditions, including pH and inhibitors, on PRA values requires detailed investigation.

    Purpose of the Study:

    • To investigate the impact of pH and various angiotensinase inhibitors on in vitro angiotensin I generation during PRA assays.
    • To determine the optimal conditions for sensitive PRA measurement, especially in patients with low renin activity.

    Main Methods:

    • Comparative analysis of PRA values generated at different pH levels (5.7 vs. 7.4).
    • Evaluation of PRA measurements using distinct angiotensinase inhibitors: diisopropylfluorophosphate (DRP) versus a combination of dimercaprol (BAL) and hydroxyquinoline (8-OHQ).

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  • Assessment of PRA distribution in 124 hypertensive patients on a normal sodium diet using optimized conditions (pH 5.7, BAL, 8-OHQ).

    • Main Results:

    • PRA values were significantly higher at pH 5.7 compared to pH 7.4.
    • At pH 5.7, DRP yielded higher PRA values than the BAL/8-OHQ mixture, suggesting potential interference of inhibitors with the renin-angiotensinogen reaction.
    • A strong correlation was observed between PRA values obtained using different methods.
    • The optimized method (pH 5.7, BAL, 8-OHQ) demonstrated sensitivity in detecting low PRA in hypertensive patients.

    Conclusions:

    • Assay pH critically influences in vitro angiotensin I generation and PRA values.
    • Certain angiotensinase inhibitors may interact with the renin-angiotensinogen reaction, affecting PRA results.
    • The developed assay conditions enhance sensitivity for detecting low PRA, aiding in the diagnosis and management of specific hypertensive patient groups.