Travis, Mary

Background Difficulty tolerating the uncertainty of ambiguous or unpredictable situations may influence how patients with functional motor disorder (FMD) respond to treatment. However, only one study has examined the role of intolerance of uncertainty (IU) in FMD treatment. Objectives This study sought to expand on prior findings in a larger sample of patients with FMD who completed an intensive motor-retraining programme. Methods A consecutive cohort of 109 patients with FMD completed a 1-week intensive outpatient motor-retraining programme. Patients rated their IU using the Intolerance of Uncertainty Scale-12 and functional motor outcomes using three empirical measures before and after treatment. Univariate and multivariable analyses were conducted to (1) characterise the rate of elevated IU, (2) evaluate potential changes in IU across the programme, (3) examine whether changes in IU predict improvements in motor functioning and (4) determine if IU incrementally predicts functional improvements in patients with clinically elevated IU. Results Findings revealed that clinically elevated IU was common (yielding a base rate of 44%) and that the ‘prospective’ subtype of IU significantly decreased with 1 week of FMD treatment. Change in IU was not significantly associated with improved functional outcomes across the sample. However, change in prospective IU did predict patient-specific functional outcomes among those with clinically elevated IU ( R 2 =11%). Conclusions Findings support prior work suggesting that certain subtypes of IU are common, modifiable and related to treatment outcomes in FMD. The ‘prospective’ subtype of IU may represent an operative factor that can enhance the efficacy of existing FMD rehabilitation programmes.

Background Intolerance of Uncertainty (IU) has never been explored in functional motor disorder (FMD) or any functional neurological disorder but perceptions of control are theoretically relevant. Objective To evaluate if IU changes in people with FMD completing intensive 1-week motor retraining treatment, and if IU change associates with outcome. Methods A consecutive cohort of 45 FMD patients completed a 1-week intensive outpatient motor retraining treatment. At program beginning and end, patients self-rated IU using the Intolerance of Uncertainty Scale-12 (IUS-12) and four functional impairment measures. Paired t-tests analyzed program changes in IU and functional outcomes. Linear regressions analyzed association strength between IU change and outcome. Results IU improved with FMD treatment (p < 0.001). Pre- to post-treatment IU was improved in 32/45 (71%), stable in 5/45 (11%), and worsened in 8/45 (18%). Age, symptom duration, and FMD phenotype did not predict IU improvement. Self-rated function improved across measures with treatment (p < 0.001). Program change in IU positively predicted outcome on 3 of 4 measures. Conclusions IU improves with FMD rehabilitation, even without explicit psychological focus of treatment, regardless of age or FMD phenotype. Improving IU associates with positive FMD treatment outcomes suggesting an important treatment target in FMD.