Brazilian Medical Association guidelines for the diagnosis and differential diagnosis of panic disorder

The definition of treatment resistance in anxiety disorders: a Delphi method-based consensus guideline

Anxiety disorders are very prevalent and often persistent mental disorders, with a considerable rate of treatment resistance which requires regulatory clinical trials of innovative therapeutic interventions. However, an explicit definition of treatment-resistant anxiety disorders (TR-AD) informing such trials is currently lacking. We used a Delphi method-based consensus approach to provide internationally agreed, consistent and clinically useful operational criteria for TR-AD in adults. Following a summary of the current state of knowledge based on international guidelines and an available systematic review, a survey of free-text responses to a 29-item questionnaire on relevant aspects of TR-AD, and an online consensus meeting, a panel of 36 multidisciplinary international experts and stakeholders voted anonymously on written statements in three survey rounds. Consensus was defined as ≥75% of the panel agreeing with a statement. The panel agreed on a set of 14 recommendations for the definition of TR-AD, providing detailed operational criteria for resistance to pharmacological and/or psychotherapeutic treatment, as well as a potential staging model. The panel also evaluated further aspects regarding epidemiological subgroups, comorbidities and biographical factors, the terminology of TR-AD vs. "difficult-to-treat" anxiety disorders, preferences and attitudes of persons with these disorders, and future research directions. This Delphi method-based consensus on operational criteria for TR-AD is expected to serve as a systematic, consistent and practical clinical guideline to aid in designing future mechanistic studies and facilitate clinical trials for regulatory purposes. This effort could ultimately lead to the development of more effective evidence-based stepped-care treatment algorithms for patients with anxiety disorders.

Anxiety Sensitivity and Panic Disorder: Evaluation of the Impact of Cognitive-Behavioral Group Therapy

Anxiety sensitivity (AS) is a multidimensional construct associated with the etiology and maintenance of panic disorder (PD) symptoms. However, only a few studies have evaluated whether cognitive-behavioral group therapy (CBGT) can modify the condition. The objective of this study was to evaluate the impact of CBGT on AS in patients with PD and to analyze AS and its dimensions as predictors of response to CBGT. In the present clinical trial, an intervention group (n = 37) attended 12 CBGT sessions, while a control group (n = 52) did not receive any intervention. The severity of symptoms and of AS were evaluated before and after CBGT in the intervention group and once in the control group. Significant improvement occurred in all specific PD symptoms and in general anxiety and depressive symptoms. Furthermore, AS scores reduced significantly after intervention. This study confirmed that AS is higher in patients with more severe PD. The effectiveness of CBGT for reducing the physical, cognitive, and social dimensions of AS was also observed, supporting the hypothesis of a positive impact of therapy.

Resilience and coping strategies in cognitive behavioral group therapy for patients with panic disorder

BACKGROUND

Although resilience and coping are important factors associated with mental health, they are rarely investigated in the treatment of patients with panic disorder (PD).

OBJECTIVE

To evaluate the response to four resilience and coping strategy sessions added to the standard cognitive behavioral group therapy (CBGT) protocol for PD.

DESIGN

Controlled clinical trial.

METHODS

The control group (n = 50) attended 12 CBGT sessions, while the intervention group (n = 50) received four additional resilience and coping strategy sessions, i.e., 16 in total. Symptom severity, resilience, coping strategies, and quality of life were assessed at baseline and post-CBGT.

RESULTS

Symptom severity and maladaptive coping strategies decreased significantly in both groups. However, the intervention group had increased resilience and improvement in the environment domain of quality of life.

CONCLUSIONS

Additional sessions have potential benefits for coping skills and resilience in PD patients, but these benefits should be evaluated in further long-term studies.

Respiratory subtype of panic disorder: Can serum phosphate levels be a possible outcome to group cognitive-behavior therapy?

OBJECTIVE

Panic disorder (PD) respiratory subtype (RS) was described in order to cluster patients according to their symptoms. These patients are characterized by experiencing a relatively high number of noticeable respiratory symptoms during a panic attack (PA) and a higher reactivity to CO₂. In this study, we aimed to evaluate the clinical relevance of this diagnostic category, evaluating if there are different responses to cognitive-behavioral therapy in patients with panic disorder RS as compared to those with the non-respiratory subtype (NRS), using serum phosphate as a biological marker.

METHODS

Patients were assessed by a clinical interview followed by a structured diagnostic interview (M.I.N.I) and classified as RS or NRS based on symptoms. The severity of PD was evaluated throughout the PDSS, CGI, HAM-A, STAI and the BDI rating scales. All patients underwent 12 structured sessions of group-CBT for PD and had their blood collected at baseline and after treatment to assess phosphate levels.

RESULTS

One hundred and thirty-eight patients have been assessed, and 102 were included in this trial. Sixty-nine patients completed the treatment protocol, 42 were classified as RS and 27 as NRS. Both RS and NRS patients improved in all clinical scales (p < 0.001). The mean phosphate levels increased from 2.44 mg/dl ± 0.49 at baseline to 3.38 mg/dl ± 0.52 (p < 0.01) in the RS group as well as from 2.46 mg/dl ± 0.64 at baseline to 3.46 mg/dl ± 0.61 (p < 0.01) in the NSR group.

LIMITATIONS

Small sample size and the lack of assessment of other clinical and physiological parameters, such as respiratory variables.

CONCLUSION

Our findings suggest that both RS and NRS benefit from group CBT and that there was a change in phosphate levels after effective treatment in both groups. Our data support the idea that there is a reversal of the conditions that promote hypophosphatemia as chronic hyperventilation after CBT treatment, whereas it is in disagreement to the presence of two different PD subtypes based on phosphate levels once their rates did not differ at baseline and had a similar increase after effective treatment.