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Conn's syndrome: a simple diagnostic approach.

S Mathew1, B Perakath, A Nair

  • 1Christian Medical College, Vellore, Tamil Nadu, India.

The National Medical Journal of India
|December 29, 1999
PubMed
Summary

Simple tests and CT scans accurately diagnose Conn's syndrome (primary aldosteronism). While surgery cures hypokalemia, hypertension often persists post-adrenalectomy.

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Area of Science:

  • Endocrinology
  • Surgical Endocrinology

Background:

  • Primary aldosteronism diagnosis typically involves biochemical tests and adrenal imaging.
  • Conn's syndrome (adrenal tumor) requires surgery, while bilateral adrenal hyperplasia is medically managed.
  • Diagnostic methods evolved with the introduction of aldosterone and plasma renin activity assays in 1994.

Purpose of the Study:

  • To evaluate the diagnostic accuracy of simple biochemical tests and CT imaging for Conn's syndrome.
  • To compare diagnostic approaches before and after the availability of aldosterone and plasma renin activity assays.

Main Methods:

  • Retrospective study of 17 patients with Conn's syndrome from 1990 to 1998.
  • Analysis of diagnostic criteria including serum/urinary potassium, CT scans, and hormonal assays.
  • All patients underwent adrenalectomy after preoperative preparation.

Main Results:

  • Pre-1994 diagnosis relied on hypertension, hypokalemia, kaliuresis, alkalosis, and CT scans.
  • Post-1994, aldosterone and plasma renin activity (PRA) assays were incorporated.
  • No operative mortality; all patients achieved normokalemia post-surgery, but 43.8% had persistent hypertension.

Conclusions:

  • Simple investigations and CT imaging are adequate for accurate Conn's syndrome diagnosis.
  • Extensive biochemical testing (aldosterone, PRA) is valuable for uncertain cases.
  • Surgery resolves hypokalemia but approximately 45% of patients experience residual hypertension.

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