Comparing Different Treatments in Reducing Dissociative Seizure Occurrence — CODES  

Conversion Disorder Clinical Trial

Official title: COgnitive Behavioural Therapy Versus Standardised Medical Care for Adults With Dissociative Non-Epileptic Seizures: A Multicentre Randomised Controlled Trial (CODES)

Status Completed

Clinical Trial Summary

The study will test the hypothesis that Cognitive Behavioural Therapy plus Standardised Medical Care (SMC) will have greater clinical and cost effectiveness than SMC alone in treating adult patients with dissociative seizures which had not initially ceased after diagnosis.

About 12-20% of patients who attend neurology or specialist epilepsy clinics because of seizures do not in fact have epilepsy. Most of these people have what are referred to as dissociative (non-epileptic) seizures (DS). This means that they have episodes that resemble epileptic seizures but which have no medical reason for their occurrence and instead are due to psychological factors. In younger adults DS are about four times more common in women than men. A high percentage of these people will have other psychological or psychiatric problems and may have other medically unexplained symptoms. It is generally thought that people with DS will benefit from psychological treatments. However, studies on this have been small or have not compared the psychological therapy with the treatment people normally receive (standardised medical care). There is some evidence that cognitive behavioural therapy (CBT), which is a widely accepted talking therapy that focuses on the person's thoughts, emotions and behaviour, as well as considering the physical reactions and sensations that may occur in people's bodies, may lead to a reduction in how often people have DS. The investigators have previously developed a CBT package for people with DS. In a relatively small study by our group, published in 2010, people receiving CBT overall showed greater reduction in how often they had their DS. The investigators are now conducting a larger study, across several different hospitals, to obtain more definite results about the effectiveness of our CBT approach for DS.

The investigators aim to invite ~ 500 adult patients with DS (but without current active epilepsy), who have been given their diagnosis by a neurologist or specialist in epilepsy, to take part in their study. Up to 698 might be invited if insufficient patients are progressing to the RCT.

The investigators will collect initial information about these people and ask them to keep a record of how often they have their DS following diagnosis. Three months after the diagnosis, those who have agreed to take part in the study will be seen by a psychiatrist, who will undertake a psychiatric assessment and ask them about factors which may have led to the development of their DS. Patients who have continued to have DS in the previous 8 weeks and who meet other eligibility criteria and are willing to take part in the trial, will be randomly allocated to standardised medical care or CBT (plus standardised medical care) as further treatment for their seizures. These people will be asked to continue to complete seizure diaries and questionnaires, provide regular seizure frequency data following receipt of DS diagnosis and will need to be willing to attend weekly/fortnightly sessions if allocated to CBT. The investigators initially aim to randomise 298 people (149 to each study arm) although now allow for up to 356 to account for loss to follow-up.

Clinical Trial Description

There is an initial observational phase to this study followed by a parallel group, two-arm multi-centre pragmatic randomised controlled trial (interventional phase).

In the observational phase patients will be given their diagnosis of dissociative seizures by a neurologist/epilepsy specialist and will be told about the CODES study. In addition to a leaflet on dissociative seizures they will, if interested in the study and are willing to be referred to a psychiatrist, be given an information sheet about DS and about the study and the doctor will document their agreement to be contacted by a research nurse/worker. This person will arrange to contact them, clarify study details, obtain informed consent, collect demographic details and explain seizure diary recording. They will then contact the patient fortnightly (bi-weekly)for seizure data. The investigators initially aim to recruit ~500 patients at this stage.

After 3 months the patient will be reviewed by a neuropsychiatrist/ liaison psychiatrist/ psychiatrist with interest in DS who will undertake a clinical assessment, review the patient's eligibility for the interventional phase of the study and if eligible will explain the RCT. Patients will be given a further leaflet on DS and a Participant Information Sheet and the psychiatrist will document interested patients' willingness to again be contacted by a research nurse/worker. That person will then explain the RCT in greater detail, obtain informed consent, undertake a baseline assessment including a MINI and instruct patients to keep seizure records for which data will be collected fortnightly. .Randomisation of between 298 and 356 people (depending on follow-up rates) to either CBT plus standardised medical care (SMC) or to SMC alone will occur after informed consent has been obtained and baseline measures have been collected. The stratification factor will be liaison/neuropsychiatry centre. The research workers and trial statistician will remain blinded. Computer-generated randomisation will be conducted remotely (for more details see www.ctu.co.uk - randomisation

• advanced) by the King's Clinical Trials Unit (KCTU) at the Institute of Psychiatry, Psychology and Neuroscience. The investigators will maintain strict allocation concealment. The investigators will test the RWs' blinding by asking them to record when they think that allocation was revealed and record the group to which they thought patients had been allocated.

CBT will be delivered over 12 sessions (each approximately one hour in length) over a 4-5 month period with one booster session at 9 months post randomisation. The investigators' treatment model has been developed from a single case study, trialled in an open label study and then in a Pilot RCT. The model is based on the two-process fear escape-avoidance model and conceptualises DS as dissociative responses to cues (cognitive/emotional/physiological or environmental) that may (but not in all cases) have been associated with profoundly distressing or life-threatening experiences, such as abuse or trauma, at an earlier stage in the person's life and which have previously produced intolerable feelings of fear and distress. Written handouts supplement the content of face-to face therapy sessions. The investigators will record therapy sessions and undertake treatment fidelity ratings. Therapists will receive training prior to treating study patients.

Neurologists and psychiatrists with an interest in DS will deliver standardised medical care (SMC). They will have guidelines as to the delivery of standardised medical care. Information leaflets will be given to the patients. The research team will provide this material. SMC by psychiatrists will include support, consideration of psychiatric comorbidities and any associated drug treatment and general review but no CBT techniques.

The investigators allow for some local variation in the number of neurology and psychiatry SMC sessions after randomisation.

Measures will be recorded at baseline, six months and 12 months post randomisation. In addition to quantitative analyses, a nested qualitative study will investigate experiences of CBT and SMC and factors acting as facilitators and barriers to participation, as well as of healthcare professionals'.experiences of delivering the study. ;

Related Conditions & MeSH terms

• Conversion Disorder
• Convulsion, Nonepileptic
• Disease
• Dissociative Disorder
• Dissociative Disorders
• Seizures

• NCT number: NCT02325544
• Study type: Interventional
• Source: King's College London
• Status: Completed
• Phase: N/A
• Start date: October 1, 2014
• Completion date: June 2018