Transcranial sonography of brainstem structures in panic disorder

Area of Science:

• Neuroimaging
• Psychiatry
• Neurosonology

Background:

• Panic disorder is linked to altered serotonin metabolism in the brainstem raphe.
• Brainstem raphe alterations may play a role in the pathophysiology of panic disorder.

Purpose of the Study:

• To investigate brainstem raphe echogenicity using transcranial sonography (TCS) in patients with panic disorder.
• To determine if TCS can identify neuroimaging markers associated with panic disorder.

Main Methods:

• Utilized transcranial sonography (TCS) to assess brainstem raphe and substantia nigra echogenicity.
• Employed both visual and digitized image analysis on anonymized images.
• Included derivation (96 healthy volunteers) and validation (26 healthy volunteers, 26 panic disorder patients) cohorts.

Main Results:

• Significantly reduced brainstem raphe echogenicity was more frequent in panic disorder patients (68% visual, 52% digitized) compared to controls (31% visual, 12% digitized).
• Digitized brainstem raphe echogenicity achieved 64% sensitivity and 73% specificity for diagnosing panic disorder.
• Reduced echogenicity correlated with shorter treatment duration and, trend-wise, lower anxiety severity.

Conclusions:

• Patients with panic disorder exhibit altered brainstem raphe echogenicity on TCS.
• These findings suggest underlying changes in the central serotonergic system in panic disorder.
• TCS may serve as a potential diagnostic tool for identifying neurobiological correlates of panic disorder.