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NAG level differences in panic disorder and agoraphobia.

Michael J Garvey1, Russell Noyes

  • 1Department of Psychiatry, University of Iowa College of Medicine, Iowa City, IA, USA. michael-garvey@uiowa.edu

Journal of Anxiety Disorders
|August 4, 2005
PubMed
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Urinary enzyme levels may help distinguish panic disorder (PD) from agoraphobia. N-acetyl-beta-glucosaminidase (NAG) levels were significantly lower in panic disorder patients, suggesting these conditions may be distinct diseases.

Area of Science:

  • Psychiatry
  • Biochemistry
  • Medical Diagnostics

Background:

  • The relationship between panic disorder (PD) and agoraphobia remains debated, with uncertainty regarding their classification as distinct entities or variants of a single disorder.
  • Urinary lysosomal enzyme N-acetyl-beta-glucosaminidase (NAG) levels have demonstrated variability across different psychiatric conditions, suggesting potential utility as a biomarker.

Purpose of the Study:

  • To investigate whether urinary NAG levels differ between patients diagnosed with panic disorder and those with agoraphobia.
  • To assess if observed differences in NAG levels could support or refute the hypothesis that PD and agoraphobia are distinct medical conditions.

Main Methods:

  • A comparative study was conducted involving 91 patients diagnosed with agoraphobia and 24 patients diagnosed with panic disorder.

Related Experiment Videos

  • Urinary levels of the enzyme N-acetyl-beta-glucosaminidase (NAG) were measured and compared between the two patient groups.

    • Main Results:

    • Patients with panic disorder exhibited significantly lower mean urinary NAG levels (9.7 ± 8) compared to patients with agoraphobia (22 ± 21).
    • The observed statistically significant difference (P < .005) indicates a potential biochemical distinction between the two disorders.

    Conclusions:

    • The findings provide limited evidence supporting the hypothesis that panic disorder and agoraphobia represent distinct diseases.
    • Urinary NAG levels may serve as a potential biomarker for differentiating between panic disorder and agoraphobia, warranting further investigation.