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Nephrogenous cyclic AMP levels in primary hyperparathyroidism.

J C Babka, R H Bower, J Sode

    Archives of Internal Medicine
    |October 1, 1976
    PubMed
    Summary
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    Diagnosing hyperparathyroidism is challenging due to overlapping urinary cyclic adenosine-3

    Area of Science:

    • Endocrinology
    • Nephrology
    • Clinical Diagnostics

    Background:

    • Urinary cyclic adenosine-3',5'-monophosphate (cAMP) measurements have limited clinical utility for diagnosing hyperparathyroidism due to overlap between patient groups.
    • Accurate diagnosis of hyperparathyroidism is crucial for effective patient management.

    Purpose of the Study:

    • To evaluate the diagnostic potential of parathyroid hormone (PTH)-dependent, nephrogenous cAMP in differentiating hyperparathyroid patients from healthy controls.
    • To assess whether nephrogenous cAMP levels can overcome the limitations of total urinary cAMP measurements.

    Main Methods:

    • Collected two-hour urine samples and blood from 23 primary hyperparathyroidism patients and 19 control subjects.
    • Calculated nephrogenous cAMP by subtracting filtered cAMP from total urinary cAMP excretion.

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  • Measured total urinary cAMP excretion in micromols per gram of creatinine.

    • Main Results:

    • Total urinary cAMP excretion was significantly higher in hyperparathyroid patients (6.8 ± 0.5 SE) compared to controls (2.9 ± 0.15), but showed considerable overlap.
    • Nephrogenous cAMP levels, expressed as a percentage of total cAMP, were markedly higher in hyperparathyroid patients (72.5 ± 1.8%) than in controls (26.3 ± 4.1%).
    • Nephrogenous cAMP levels clearly distinguished between the hyperparathyroid and control groups.

    Conclusions:

    • Nephrogenous cAMP determination offers a distinct separation between hyperparathyroid patients and normal individuals.
    • This method shows promise for improving the diagnostic accuracy of hyperparathyroidism.
    • Nephrogenous cAMP measurement may be a valuable tool in the clinical diagnosis of hyperparathyroidism.