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Psychoticism in patients with panic disorder with or without comorbid agoraphobia.

OBJECTIVE: A few case-reports have previously described transient psychotic-like symptoms in non-psychotic patients with panic disorder (PD). We aimed to systematically explore whether PD patients without any current or past psychosis can be differentiated according to the severity of 'psychoticism' as a dimension, comprising clinical features such as psychotic-like experiences, increased social alienation, hostility and suspiciousness.

METHODS: Sample included 35 (female = 26) medication-free, non-psychotic patients consecutively referred from our Department's Outpatient Clinic for acute symptoms of DSM-5 PD with (PDA; N = 29) or without concurrent agoraphobia. Psychometric measures included the Symptom Checklist-90-Revised (SCL-90-R), Agoraphobic Cognitions Questionnaire (ACQ), Body Sensations Questionnaire (BSQ), and panic attacks during last 21 days PA-21d.

RESULTS: Multiple regression analysis (forward stepwise) revealed that, among all SCL-90-R subscales, the psychoticism-subscale was most significantly associated with panic-related beliefs included in the ACQ, while significant associations emerged between the paranoid ideation-subscale and the ACQ and BSQ measures. Moreover, significant correlations emerged between the SCL-90-R psychoticism-subscale and all three measures of PD symptoms (ACQ, BSQ, PA-21d) and between the SCL-90-R paranoid ideation-subscale and both the ACQ and BSQ.

CONCLUSIONS: This significant association between levels of psychoticism and severity of panic symptoms may reflect a more severe subtype of PD.

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