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Kellner, M. et al.

Kellner, Yassouridis, Jahn, Wiedemann,

Influence of clonidine on psychopathological, endocrine and respiratory effects of cholecystokinin tetrapeptide in patients with panic disorder.

The influence of clonidine pretreatment on psychopathological, endocrine and respiratory effects of cholecystokinin tetrapeptide (CCK-4) was characterized. Patients with panic disorder (DSM-III-R) were given 50 micrograms CCK-4 i.v. at 1100 hours on 2 separate study days. In a randomized double-blind design they were additionally infused with 150 micrograms clonidine or placebo from 1040 to 1110 hours. After CCK-4 all patients experienced symptom attacks. No effects of clonidine on panic psychopathology or blood gas parameters were observed. After CCK-4, in the clonidine condition the pituitary release of adrenocorticotropin (ACTH) and prolactin was seemingly enhanced compared to placebo. Our results suggest that CCK-4-induced panic attacks are not suppressible by presynaptic alpha-2 receptor stimulation. Moreover, they point to a synergistic postsynaptic action of clonidine to CCK-4 upon pituitary hormone secretion. The diverging sites of action might possibly explain the discrepancies of psychopathological alterations and stress hormone secretion.[1]

References

Influence of clonidine on psychopathological, endocrine and respiratory effects of cholecystokinin tetrapeptide in patients with panic disorder. Kellner, M., Yassouridis, A., Jahn, H., Wiedemann, K. Psychopharmacology (Berl.) (1997) [Pubmed]

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