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Elevated urinary norepinephrine in interstitial cystitis.

P C Stein1, A Torri, C L Parsons

  • 1Department of Surgery, University of California San Diego Medical Center, 92103-8897, USA.

Urology
|June 15, 1999
PubMed
Summary
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Urinary norepinephrine levels are elevated in patients with interstitial cystitis (IC), suggesting increased sympathetic activity. These elevated levels did not change with treatment or symptom severity.

Area of Science:

  • Urology
  • Neuroendocrinology
  • Biochemistry

Background:

  • Interstitial cystitis (IC) is a chronic condition characterized by bladder pain and urinary urgency.
  • The underlying pathophysiology of IC is not fully understood, but neurogenic inflammation and increased sympathetic activity have been implicated.

Purpose of the Study:

  • To quantify urinary catecholamine levels in patients diagnosed with interstitial cystitis (IC).
  • To investigate the potential correlation between elevated urinary catecholamines and the presence of IC.

Main Methods:

  • Enzyme-linked immunosorbent assay (ELISA) was used to measure norepinephrine and normetanephrine in urine samples.
  • Urine samples were collected from patients with IC (n=111) and healthy volunteers (n=92).
  • Creatinine levels were measured to normalize catecholamine concentrations.

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Main Results:

  • Patients with IC exhibited significantly higher urinary norepinephrine levels compared to controls (89.1 ± 58.3 vs. 54.9 ± 37.1 μg/g creatinine, P < 0.05).
  • No significant difference in normetanephrine levels was observed between IC patients and controls.
  • Elevated norepinephrine levels in IC patients did not decrease after 1-15 months of treatment with various medications.

Conclusions:

  • Elevated urinary norepinephrine in IC patients suggests increased sympathetic (adrenergic) activity, potentially originating from the bladder or adrenal glands.
  • The findings are consistent with the hypothesis that heightened sympathetic tone contributes to IC pathophysiology.
  • Norepinephrine levels did not correlate with symptom severity or improve with common IC treatments.