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Subjective perspectives on aetiological factors in atypical depression have not been previously explored from the viewpoint of those with lived experience. This study aimed to explore individuals' subjective experiences and explanations of atypical depression, and to examine whether perceived gender-specific influences might contribute to the observed gender disparity in atypical depression prevalence. Semi-structured, one-to-one interviews were conducted online with 16 individuals. Data were analysed using thematic analysis, employing an inductive approach and interpreted within a constructionist framework. Data coding was conducted using NVivo. Key themes centred on the prevalence of comorbid conditions and how they affected atypical depression presentation; how trauma was seen as both a causal factor and catalyst; the subjective impact of gender identity and roles; how environmental factors seemed to affect atypical depression onset and presentation; the difficulties experienced with atypical depression symptom variability in daily life; and reported coping behaviours. These findings highlight how individuals with atypical depression believed onset to be linked to experiences of trauma and comorbidity, in addition to ongoing influences of varied environmental factors. The variability of atypical depression symptoms in both the short and long term appears to be a core challenge in this subgroup. The gender disparity of atypical depression is also explored through the lens of lived experience and gender identity. Future research would benefit from exploring further these potential contributing factors, to provide a better understanding of their complex influences on atypical depression onset and maintenance.

Advances have been made in understanding the aetiology of functional neurological disorder (FND); however, its pathophysiological mechanisms have not been definitively demonstrated. Evidence suggests interacting roles for altered emotional processing and interoception, elevated autonomic arousal, and dissociation, but there is limited evidence demonstrating their causal influence on specific FND symptoms. Our superordinate aim is to elucidate potentially shared and distinct aetiological factors and mechanisms in two common FND subtypes, functional seizures (FS) and functional motor symptoms (FMS). This study has a multimodal, mixed between- and within-groups design. The target sample is 50 individuals with FS, 50 with FMS, 50 clinical controls (anxiety/depression), and 50 healthy controls. Potential aetiological factors (e.g., adverse life events, physical/mental health symptoms, dissociative tendencies, interoceptive insight/sensibility) will be assessed with a detailed medical history interview and self-report questionnaires. A laboratory session will include a neurocognitive battery, psychophysiological testing, cardiac interoception and time estimation tasks and an isometric handgrip task. A subsample will undergo magnetic resonance imaging, including structural, resting-state and task-based scans combined with psychophysiological recording. Remote monitoring with ecological momentary assessment and wearables will measure variability in FND symptoms and their potential predictors/correlates for ≥2 weeks in patients' daily lives. Longitudinal follow-ups at 3, 6, and 12-months will monitor longer-term outcomes in the clinical groups. This study employs multimodal research methods to rigorously examine several putative mechanisms in FND, at subjective/experiential, behavioural, and physiological levels. The study will test causal hypotheses about the role of altered emotional processing, autonomic arousal, dissociation and interoception in the initiation or exacerbation of FND symptoms, directly comparing these processes in FS and FMS to healthy and clinical controls. This is the first study of its kind, with potential to reveal important targets for prevention and treatment of FND in future.

ObjectivesTranscranial magnetic stimulation (TMS) has been used therapeutically for functional (conversion) motor symptoms but there is limited evidence for its efficacy and the optimal protocol. We examined the feasibility of a novel randomised controlled trial (RCT) protocol of TMS to treat functional limb weakness.DesignA double-blind (patient, outcome assessor) two parallel-arm, controlled RCT.SettingSpecialist neurology and neuropsychiatry services at a large National Health Service Foundation Trust in London, UK.ParticipantsPatients with a diagnosis of functional limb weakness (Diagnostic and Statistical Manual of Mental Disorders - Fifth Edition). Exclusion criteria included comorbid neurological or major psychiatric disorder, contraindications to TMS or previous TMS treatment.InterventionsPatients were randomised to receive either active (single-pulse TMS to primary motor cortex (M1) above resting motor threshold) or inactive treatment (single-pulse TMS to M1 below resting motor threshold). Both groups received two TMS sessions, 4 weeks apart.Outcome measuresWe assessed recruitment, randomisation and retention rates. The primary outcome was patient-rated symptom change (Clinical Global Impression–Improvement scale, CGI-I). Secondary outcomes included clinician-rated symptom change, psychosocial functioning and disability. Outcomes were assessed at baseline, both TMS visits and at 3-month follow-up.ResultsTwenty-two patients were recruited and 21 (96%) were successfully randomised (active=10; inactive=11). Nineteen (91%) patients were included at follow-up (active=9; inactive=10). Completion rates for most outcomes were good (80%–100%). Most patients were satisfied/very satisfied with the trial in both groups, although ratings were higher in the inactive arm (active=60%, inactive=92%). Adverse events were not more common for the active treatment. Treatment effect sizes for patient-rated CGI-I scores were small-moderate (Cliff’s delta=−0.1–0.3, CIs−0.79 to 0.28), reflecting a more positive outcome for the active treatment (67% and 44% of active arm-rated symptoms as ‘much improved’ at session 2 and follow-up, respectively, vs 20% inactive group). Effect sizes for secondary outcomes were variable.ConclusionsOur protocol is feasible. The findings suggest that supramotor threshold TMS of M1 is safe, acceptable and potentially beneficial as a treatment for functional limb weakness. A larger RCT is warranted.Trial registration numberISRCTN51225587.

Studies have reported elevated rates of dissociative symptoms and comorbid dissociative disorders in functional neurological disorder (FND); however, a comprehensive review is lacking. To systematically review the severity of dissociative symptoms and prevalence of comorbid dissociative disorders in FND and summarise their biological and clinical associations. We searched Embase, PsycInfo and MEDLINE up to June 2021, combining terms for FND and dissociation. Studies were eligible if reporting dissociative symptom scores or rates of comorbid dissociative disorder in FND samples. Risk of bias was appraised using modified Newcastle-Ottawa criteria. The findings were synthesised qualitatively and dissociative symptom scores were included in a meta-analysis (PROSPERO CRD42020173263). Seventy-five studies were eligible (FND = 3940; control = 3073), most commonly prospective case-control studies ( = 54). Dissociative disorders were frequently comorbid in FND. Psychoform dissociation was elevated in FND compared with healthy ( = 0.90, 95% CI 0.66-1.14, = 70%) and neurological controls ( = 0.56, 95% CI 0.19-0.92, = 67%). Greater psychoform dissociation was observed in FND samples with seizure symptoms versus healthy controls ( = 0.94, 95% CI 0.65-1.22, = 42%) and FND samples with motor symptoms ( = 0.40, 95% CI -0.18 to 1.00, = 54%). Somatoform dissociation was elevated in FND versus healthy controls ( = 1.80, 95% CI 1.25-2.34, = 75%). Dissociation in FND was associated with more severe functional symptoms, worse quality of life and brain alterations. Our findings highlight the potential clinical utility of assessing patients with FND for dissociative symptomatology. However, fewer studies investigated FND samples with motor symptoms and heterogeneity between studies and risk of bias were high. Rigorous investigation of the prevalence, features and mechanistic relevance of dissociation in FND is needed.

IntroductionFunctional neurological disorder (FND) refers to an involuntary loss of control over and/or aberrant perception of the body. Common presenting symptoms are functional (non-epileptic) seizures, and functional motor disorder, for example, walking difficulties, weakness or tremor. Greater access to effective treatments would lead to reduced distress and disability; and reduce unnecessary healthcare costs.This study will examine eye-movement desensitisation and reprocessing therapy (EMDR) as a treatment for FND. EMDR is an evidence-based treatment for post-traumatic stress disorder (PTSD), but its use for other conditions is growing. An FND-specific EMDR protocol will be tested, and if the intervention proves feasible with promising clinical outcomes, progression to a substantive study could take place.Methods and analysisFifty adult patients diagnosed with FND will be recruited. It will be a single-blind randomised controlled trial with two arms: EMDR (plus standard neuropsychiatric care; NPC) and standard NPC. The two groups will be compared at baseline (T0), 3 months (T1), 6 months (T2) and 9 months (T3). Measures of feasibility include safety, recruitment, retention, treatment adherence and acceptability. Clinical outcome measures will assess health-related functioning/quality of life, ratings of FND symptoms and severity, depression, anxiety, PTSD, dissociation, service utilisation and other costs. Improvement and satisfaction ratings will also be assessed. Feasibility outcomes will be summarised using descriptive statistics. Exploratory analyses using (linear/logistic) mixed-effect models will examine the rate of change in the groups’ clinical outcome measures across the four time-points.After the intervention period, a sample of participants, and clinicians, will be invited to attend semistructured interviews. The interviews will be analysed using reflexive thematic analysis.Ethics and disseminationThis study has been approved by the NHS West Midlands—Edgbaston Research Ethics Committee. Study findings will be published in open access peer-reviewed journals, presented at conferences, and communicated to participants and other relevant stakeholders.Trial registrationNCT05455450 (www.clinicaltrials.gov).

Functional neurological disorder (FND), formerly known as conversion disorder, causes a high burden of disability and distress, and is amongst the most commonly encountered conditions in neurology clinics and neuropsychiatric services, yet the therapeutic evidence base is somewhat limited. There has been recent interest in the therapeutic potential of psychedelics such as psilocybin and lysergic acid diethylamide (LSD), and in recent studies psychedelics have shown promise in treating a range of neuropsychiatric conditions. Modification of neural circuits associated with self-representation is thought to underlie some of this effect, and as some contemporary theories of FND focus on aberrant somatic self-representation, psychedelics may therefore represent an unexplored treatment option for FND. We systematically reviewed studies involving the use of psychedelics in FND. Nine studies published between 1954 and 1967, with a total of 26 patients, were identified. Due to restriction of licencing of psychedelic drugs since this period, no modern studies were identified. In most cases, patients received a course of psychotherapy with variable adjunctive administration of psychedelics (in a combination known as ‘psycholytic therapy’), with protocols varying between studies. Of those treated, 69% (n = 18) were found to have made at least some recovery on heterogeneous and subjective clinician-rated criteria. Adverse events were mostly mild and transient; however, at least one patient terminated the study due to distressing effects. All included studies were of low quality, often lacking control groups and valid outcome measures. Although no conclusions on efficacy may be drawn from these data, further research may help to determine whether psychedelics offer a feasible, safe and effective treatment for FND.

Functional neurological disorder (FND) is a common and highly disabling disorder, but its aetiology remains enigmatic. Conceptually, there has been reduced emphasis on the role of psychosocial stressors in recent years, with a corresponding increase in neurobiological explanations. However, a wealth of evidence supports the role of psychosocial adversities (eg, stressful life events, interpersonal difficulties) as important risk factors for FND. Therefore, there is a need to integrate psychosocial (environmental) and neurobiological factors (eg, sensorimotor and cognitive functions) in contemporary models of FND. Altered emotional processing may represent a key link between psychosocial risk factors and core features of FND. Here, we summarise and critically appraise experimental studies of emotional processing in FND using behavioural, psychophysiological and/or neuroimaging measures in conjunction with affective processing tasks. We propose that enhanced preconscious (implicit) processing of emotionally salient stimuli, associated with elevated limbic reactivity (eg, amygdala), may contribute to the initiation of basic affective/defensive responses via hypothalamic and brainstem pathways (eg, periaqueductal grey). In parallel, affect-related brain areas may simultaneously exert a disruptive influence on neurocircuits involved in voluntary motor control, awareness and emotional regulation (eg, sensorimotor, salience, central executive networks). Limbic-paralimbic disturbances in patients with FND may represent one of several neurobiological adaptations linked to early, severe and/or prolonged psychosocial adversity. This perspective integrates neurobiological and psychosocial factors in FND and proposes a research agenda, highlighting the need for replication of existing findings, multimodal sampling across emotional response domains and further examination of emotional influences on sensorimotor and cognitive functions in FND populations.

Objectives This International League Against Epilepsy (ILAE) Report: (a) summarizes the literature about “driving and psychogenic nonepileptic seizures (PNES)”; (b) presents the views of international experts; and (c) proposes an approach to assessing the ability of persons with PNES (PwPNES) to drive. Methods Phase 1: Systematic literature review. Phase 2: Collection of international expert opinion using SurveyMonkey®. Experts included the members of the ILAE PNES Task Force and individuals with relevant publications since 2000. Phase 3: Joint analysis of the findings and refinement of conclusions by all participants using email. As an ILAE Report, the resulting text was reviewed by the Psychiatry Commission, the ILAE Task Force on Driving Guidelines, and Executive Committee. Results Eight studies identified by the systematic review process failed to provide a firm evidence base for PNES‐related driving regulations, but suggest that most health professionals think restrictions are appropriate. Twenty‐six experts responded to the survey. Most held the view that decisions about driving privileges should consider individual patient and PNES characteristics and take account of whether permits are sought for private or commercial driving. Most felt that those with active PNES should not be allowed to drive unless certain criteria were met and that PNES should be thought of as “active” if the last psychogenic seizure had occurred within 6 months. Significance Recommendations on whether PwPNES can drive should be made at the individual patient level. Until future research has determined the risk of accidents in PwPNES a proposed algorithm may guide decisions about driving advice.

Background In this qualitative study, we aimed to obtain and synthesise the views of patients with functional neurological disorder (FND), their caregivers, and relevant healthcare professionals (HCPs) on outcome measurement in FND. Methods Semi-structured interviews were conducted with 22 FND patients, 18 caregivers and 21 HCPs, sampled purposively in the United Kingdom. Transcripts were analysed through inductive thematic analysis. Results Whilst reduction or resolution of FND symptoms were frequently mentioned as important treatment goals in all groups, this was reported by a larger proportion of caregivers and HCPs than patients. Patients most frequently hoped for improvements in mental health/well-being. Other important treatment goals were resuming work, and an increase in independence, self-management or self-efficacy. Of the 20 domains deemed relevant for outcome assessment, improvements in FND symptoms, emotional well-being, activities of daily living and quality-of-life, were mentioned most frequently. None of the participants thought that outcome assessment should be purely clinician-rated or objective; all believed that the patient’s subjective experience should be central. Nevertheless, participants in all groups acknowledged that clinician-rated or objective OMIs have added value in clinical outcome assessment. The benefits of digital outcome assessment were also mentioned by several participants. Conclusions This is the first study to capture the views of key stakeholders on outcome assessment in FND. The findings indicate that outcome measures for FND should be patient-centred, whilst also including HCP opinion. Critical domains for assessment are FND symptoms, mental health, quality-of-life and the ability to perform activities of daily living.

AimsFunctional neurological disorder (FND) is common and often severe. It is poorly understood, and there have been no international large-scale studies of self- management and illness beliefs in FND. We created a patient questionnaire to assess FND demographics, symptom comorbidity, self-management strategies (particularly in relation to prohibited substances), views on novel treatments, and illness beliefs.MethodsThe questionnaire was shared open access over a three-week period.Participants were recruited internationally through social media and patient groups. RESULTS: In total, 1162 respondents from 16 countries took the survey. Of these, 98% reported a formal diagnosis of FND from a consultant neurologist or other suitably trained clinician. Females constituted 86% of respondents, with an average age of 41.7 years (SD=12.50). Mean symptom duration was 7.69 years (SD=9.37) and average time from diagnosis was 2.24 years (SD=3.35), indicating a diagnostic lag of over 5 years. Symptom comorbidity was very high, with respondents reporting current: seizures (50%), gait disturbance (76%), loss of balance (77%), tremors (61%), muscle jerks/spasms (65%), altered sensations (79%), speech difficulties (65%), memory problems (80%), fatigue (93%), and headache (70%). Current psychiatric comorbidities – depression (43%), anxiety (51%), panic (20%), and PTSD (22%) - were also common. Illness beliefs varied, with respondents agreeing most strongly that FND is a combination of physical and stress/trauma-related factors. Respondents rated FND as having a severe effect on their life, with little control felt over their symptoms. Respondents had received a wide range of medical interventions, and many had tried alternative treatments. Prohibited substances such as cannabis, ketamine, and psychedelics had been used by 15% of respondents, with the majority experiencing no or minimal physical (90%) and psychological (95%) sequelae. Many respondents reported that they would be willing to try medically supervised psychedelic therapy if it was found to be safe and effective.ConclusionsThis large international online survey of FND patients indicated a striking co-occurrence of multiple symptoms. As expected, respondents reported that FND severely impacted on their lives, and many had lived with symptoms, which are not well managed by current medical therapies, for years. There was interest in novel putative treatments, such as medically supervised psychedelic therapies, which indicates a strong need to investigate alternative treatments for this poorly served patient group.