Lisdexamfetamine for Adults With Bulimia Nervosa
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|ClinicalTrials.gov Identifier: NCT03397446|
Recruitment Status : Terminated (Loss of resources due to COVID-19 resulted in insufficient funds to complete the trial as planned. However, sufficient data was collected to fulfill the aims of the trial. Discontinuation is not related to the drug, its use, or adverse events.)
First Posted : January 12, 2018
Last Update Posted : November 27, 2020
The relatively high rates of bulimia nervosa (BN) in attention-deficit/hyperactivity disorder (ADHD) cohorts suggest a relationship between the two disorders. Interestingly, case studies involving this comorbid population have observed improvements in BN symptoms when given psychostimulants for ADHD. Case studies involving BN patents without this comorbidity have also demonstrated BN symptom improvements upon psychostimulant initiation. Recent studies have also found support for the use of lisdexamfetamine dimesylate, a psychostimulant approved for ADHD, for treating moderate to severe binge eating disorder, an eating disorder akin to BN. Given these findings, there is reason to believe that psychostimulants may also be capable of treating bulimia nervosa.
Ultimately, the investigators would like to conduct a large study that examines whether people who are diagnosed with BN will have fewer episodes of binge eating and purging when they are treated with the psychostimulant medication, lisdexamfetamine dimesylate (LDX). However, preliminary data would be helpful prior to undertaking such a large project. To this end, the aim of the current study is to learn more about a) enrolment rates, b) dropout rates, c) the applicability of our eligibility criteria, d) the potential effects of LDX on novel outcome measures for studying decision-making in BN, e) preliminary safety data, and f) estimates of treatment effect.
Participants (n = 30) will be instructed to take LDX once daily for two months while undergoing routine testing and monitoring to gather preliminary safety and treatment data. The research will take place at the Nova Scotia Health Authority Eating Disorder Clinic.
|Condition or disease||Intervention/treatment||Phase|
|Bulimia Nervosa||Drug: Lisdexamfetamine dimesylate||Phase 2|
|Study Type :||Interventional (Clinical Trial)|
|Actual Enrollment :||23 participants|
|Intervention Model:||Single Group Assignment|
|Intervention Model Description:||Participants will be instructed to take LDX once daily for two months. The trial will begin with a 4-week titration period followed by a 4-week maintenance period for a total treatment duration of 8 weeks. The treatment phase will be followed by a 1-week follow-up.|
|Masking:||None (Open Label)|
|Official Title:||A Feasibility Study to Evaluate Lisdexamfetamine Dimesylate (Vyvanse) in Adults With Bulimia Nervosa|
|Actual Study Start Date :||June 21, 2018|
|Actual Primary Completion Date :||May 19, 2020|
|Actual Study Completion Date :||May 19, 2020|
Experimental: Lisdexamfetamine dimesylate
A central nervous system stimulant, specifically, a prodrug of dextro-amphetamine
Drug: Lisdexamfetamine dimesylate
50mg or 70mg oral capsules taken once-daily for to 2 months. The trial will begin with a 4-week titration phase, where patients will titrate up to a dose of 50mg/day or 70mg/day, followed by a 4-week maintenance phase. No dose changes will be permitted during the maintenance phase.
- Enrolment rate [ Time Frame: 2 years ]Enrolment rate will be defined as the total number of participants enrolled divided by the total enrolment period in months.
- Dropout rates [ Time Frame: 2 years ]Dropout rate will be defined as the number of patients whose participation was terminated prior to completion of the post-treatment assessment divided by the total number of participants enrolled.
- The applicability of eligibility criteria [ Time Frame: 2 years ]The applicability of eligibility criteria will be determined by the ratio of participants screened to participants enrolled.
- Incidence of serious or other treatment-emergent adverse events (TEAEs) [ Time Frame: Up to 9 weeks ]Subjects will be asked to report TEAEs to the research team and PI.
- Change from baseline in weight/body mass index [ Time Frame: Up to 9 weeks ]Subjects will be weighed using a calibrated hospital scale while wearing a hospital gown and no footwear.
- Change from baseline in systolic/diastolic blood pressure (mmHg) [ Time Frame: Up to 9 weeks ]Systolic and diastolic blood pressure will be collected by a study investigator at weekly/biweekly visits.
- Change from baseline in heart rate (bpm) [ Time Frame: Up to 9 weeks ]Heart rate will be collected by a study investigator at weekly/biweekly visits.
- Incidence of abnormal adherence rates [ Time Frame: 2 months ]Adherence will be calculated as the number of pills not returned divided by the number of days since the last visit, multiplied by 100 to yield a percentage. Subjects with an adherence rate between 80% and 120% will be considered adherent to treatment.
- Incidence of abnormalities in blood analysis [ Time Frame: Up to 9 weeks ]Most relevant concerns for patients with BN taking LDX include electrolyte abnormalities (potassium, sodium, chloride) and hypoglycemia
- Incidence of abnormalities in EKG [ Time Frame: Up to 9 weeks ]Most relevant concerns for patients with BN taking LDX include prolonged QTc, hypertension, and tachycardia.
- Incidence of thoughts, ideations, and attempts of suicide, as measured by the Columbia-Suicide Severity Rating Scale (Since Last Visit Version) [ Time Frame: Up to 9 weeks ]A clinician-observed measure designed to assess suicidal ideations and suicidal behaviours since the last visit in clinical trials. The scale consists of 4 sections. Section 1 regards suicidal ideation and consists of 5 "yes" or "no" questions. Section 2 regards the intensity of ideation and asks the patient to describe their most severe ideation. In regard to that ideation, the patient then indicates frequency, duration, controllability, deterrents, and reasons for ideation. Section 3 regards suicidal behaviour, and indicates if there has been an actual attempt, interrupted attempt, aborted attempt, or preparatory acts/behaviour since the last visit. Additionally, there is a section to indicate if there was suicidal behaviour during the assessment or if there was a suicide since the last visit. Section 4 specifies information about actual attempts only (actual lethality/medical damage and potential lethality).
- Change from baseline in the number of binge eating episodes per week [ Time Frame: Up to 9 weeks ]Subjects will record the number of binge eating episodes in a food diary, which will be validated weekly by a clinician using structured questions from the Eating Disorder Examination Interview inquiring about symptom frequency since the previous study visit.
- Change from baseline in the number of purging episodes per week [ Time Frame: Up to 9 weeks ]Subjects will record the number of self-induced vomiting episodes in a diary which will be validated weekly by a clinician using structured questions from the Eating Disorder Examination Interview inquiring about symptom frequency since the previous study visit.
- Change from baseline in the number of binge eating and purging days per week [ Time Frame: Up to 9 weeks ]Binge eating and purging days are defined as having one or more episodes of binge eating or purging in a day, respectively.
- Change from baseline in the Eating Disorder Examination Interview scores [ Time Frame: Week 1, Post (End of week 8) ]A clinician-administered scale that assesses the severity of 4 areas of eating disorder psychopathology over the past 4 weeks (28 days): Eating Concern, Weight Concern, Dietary Restraint, and Shape Concern. Overall eating disorder severity is also assessed. A higher score indicates increased severity. To obtain a particular subscale score, the ratings for the relevant items are added together and the sum divided by the total number of items forming the subscale (i.e., the mean of all subscale items). To obtain a global score, the four subscales scores are summed and the resulting total divided by the number of subscales (i.e., the mean of all items). The scale consists of 28 items.
- Change from baseline in the Barratt Impulsiveness Scale scores [ Time Frame: Week 1, Week 5, Post (End of week 8) ]This 30-item measure assesses the personality/behavioural construct of impulsiveness and is widely accepted as the primary self-report measure of impulsivity. Items are ranked on a 1-4 scale (1 being "rarely/never" and 4 being "almost always/always"). A total score can be calculated using all 30 items. A higher score indicates higher levels of impulsivity.
- Change from baseline in Yale-Brown Obsessive Compulsive Scale modified for binge eating (Y-BOCS-BE) [ Time Frame: Week 1, Week 5, Post (End of week 8) ]A 10-item, clinician-administered rating scale for measuring the severity of OCD symptoms as they relate to binge eating. A higher score indicates increased severity. An obsessional subtotal can be calculated by adding items 1-5. A compulsion subtotal can be calculated by adding items 6-10. A total score can be calculated by adding all items. This version will be further modified to assess both binge eating and purging behaviours.
- Change from baseline in the three subscale scores of the Three-Factor Eating Questionnaire (TFEQ) [ Time Frame: Week 1, Week 5, Post (End of week 8) ]A 51-item self-report scale that assesses three areas of eating behaviours: Cognitive restraint of eating, disinhibition, and hunger.
- Change from baseline in Clinical Impairment Assessment (CIA) scale scores for measuring ED impairment [ Time Frame: Week 1, Week 5, Post (End of week 8) ]A 16-item self-report measure of the severity of psychosocial impairment due to eating disorder features over the past 28 days. Each item is ranked on a 0-3 scale (0 being "not at all" and 3 being "a lot").
- Percent of treatment responders (binge and purge response rate) [ Time Frame: Through study completion, up to two years ]Responders defined as ≥50% reduction in the number of binge and/ or purge episodes from baseline to the last two preceding weeks of treatment.
- Percent of binge and purge remission (binge and purge remission rate) [ Time Frame: Through study completion, up to two years ]Cessation defined as 100% reduction in binge and/or purge episodes in the last 28 days of treatment.
- Change in Clinical Global Impression - Severity Scale (CGI-S) [ Time Frame: Screening visit, Week 5, Post (End of week 8) ]A 7-point scale that requires the clinician to rate the severity of the patient's illness at time of assessment, relative to the clinician's past experience with patients who have the same diagnosis.
- Change in the Modified Two-Step Task parameters [ Time Frame: Week 1, Week 2, Week 5, Week 9 (1-week Follow-up) ]As measured by the Modified Two-Step Task. This task examines exploration/exploitation (choice consistency), as well as goal-directed (i.e., model-based) and habitual (i.e., model-free) control.
- Change from baseline in the Coping Self-Efficacy Scale (CSES) [ Time Frame: Week 1, Week 5, Post (End of week 8) ]A 26-item measure of one's confidence in performing coping behaviors when faced with life challenges.
- Change from baseline in the Locus of Control of Behaviour (LCB) [ Time Frame: Week 1, Week 5, Post (End of week 8) ]A 17-item measure of the extent to which subjects perceive responsibility for their behaviour.
- Change from baseline in Motivation, Confidence, and Readiness for Behaviour Change Questions [ Time Frame: Week 1, Week 5, Post (End of week 8) ]A 3-item measure that assesses the perceived value of changing binge eating, confidence in ability to change binge eating, and readiness to change binge eating.
- Qualitative Patient Experience Interview [ Time Frame: Week 5, Week 9 (1-week Follow-up) ]An exploratory interview which aims to collect qualitative information on each patient's experiences with the study medication (i.e., from the patient's perspective, how does the medication affect their eating disorder symptoms?).
To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT03397446
|Canada, Nova Scotia|
|Nova Scotia Health Authority|
|Halifax, Nova Scotia, Canada, B3H2E2|
|Principal Investigator:||Aaron Keshen, MD, FRCPC||Nova Scotia Health Authority/Dalhousie University|