Abstract
Background: The aim of this work was to examine a possible association between a clinically relevant panic disorder and plasma total homocysteine concentration. Methods: 23 patients with panic disorder with or without agoraphobia confirmed by a standardized clinical interview (Structural Clinical Interview for DSM-IV-German version) and 23 healthy controls matched for gender and age completed questionnaires (SCL-K9, STAI, ADS, STAXI) and had blood drawn after a 15 min rest. Plasma total homocysteine concentrations were measured by competitive enzyme immunoassay. Interfering variables such as age, gender, smoking status, comorbid depression and medication were controlled for. Results: Patients with panic disorder had higher plasma homocysteine concentrations in comparison to the control group (mean value 11.00 vs. 9.14 µmol/l, p = 0.04 with age, gender, smoking status, comorbid depression and antidepressant medication being controlled for). Furthermore, homocysteine plasma concentration was positively correlated with Global Severity of Symptoms (SCL-K9, r<sub>Pearson</sub> = 0.41, p < 0.01). Conclusion: The findings of this study suggest a link between elevated plasma homocysteine levels and panic disorder. This raises a new hypothesis of another pathway to an increased risk of cardiovascular events in anxious individuals.
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