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Neuroradiol J ; 35(2): 203-212, 2022 Apr.
Article in English | MEDLINE | ID: covidwho-1817078


OBJECTIVE: Observational studies utilising diffusion tractography have suggested a common mechanism for tremor alleviation in deep brain stimulation for essential tremor: the decussating portion of the dentato-rubro-thalamic tract. We hypothesised that directional stimulation of the dentato-rubro-thalamic tract would result in greater tremor improvement compared to sham programming, as well as comparable improvement as more tedious standard-of-care programming. METHODS: A prospective, blinded crossover trial was performed to assess the feasibility, safety and outcomes of programming based solely on dentato-rubro-thalamic tract anatomy. Using magnetic resonance imaging diffusion-tractography, the dentato-rubro-thalamic tract was identified and a connectivity-based treatment setting was derived by modelling a volume of tissue activated using directional current steering oriented towards the dentato-rubro-thalamic tract centre. A sham setting was created at approximately 180° opposite the connectivity-based treatment. Standard-of-care programming at 3 months was compared to connectivity-based treatment and sham settings that were blinded to the programmer. The primary outcome measure was percentage improvement in the Fahn-Tolosa-Marín tremor rating score compared to the preoperative baseline. RESULTS: Among the six patients, tremor rating scores differed significantly among the three experimental conditions (P=0.030). The mean tremor rating score improvement was greater with the connectivity-based treatment settings (64.6% ± 14.3%) than with sham (44.8% ± 18.6%; P=0.031) and standard-of-care programming (50.7% ± 19.2%; P=0.062). The distance between the centre of the dentato-rubro-thalamic tract and the volume of tissue activated inversely correlated with the percentage improvement in the tremor rating score (R2=0.24; P=0.04). No significant adverse events were encountered. CONCLUSIONS: Using a blinded, crossover trial design, we have shown the technical feasibility, safety and potential efficacy of connectivity-based stimulation settings in deep brain stimulation for treatment of essential tremor.

Deep Brain Stimulation , Essential Tremor , Deep Brain Stimulation/methods , Essential Tremor/surgery , Essential Tremor/therapy , Humans , Prospective Studies , Thalamus/diagnostic imaging , Treatment Outcome , Tremor/surgery
Indian J Anaesth ; 64(9): 774-783, 2020 Sep.
Article in English | MEDLINE | ID: covidwho-819031


BACKGROUND AND AIM: The anaesthesiologists are at the highest risk of contracting infection of coronavirus disease 2019 (COVID-19) in emergency room, operation theatres and intensive care units. This overwhelming situation can make them prone for psychological stress leading to anxiety and insomnia. MATERIALS AND METHODS: We did an online self-administered questionnaire-based observational cross-sectional study amongst anaesthesiologists across India. The objectives were to find out the main causes for anxiety and insomnia in COVID-19 pandemic. Generalised Anxiety Disorder-7 (GAD-7) scale and Insomnia Severity Index (ISI) were used for assessing anxiety and insomnia. RESULTS: Of 512 participants, 74.2% suffered from anxiety and 60.5% suffered from insomnia. The age <35 years, female sex, being married, resident doctors, fear of infection to self or family, fear of salary deductions, increase in working hours, loneliness due to isolation, food and accommodation issues and posting in COVID-19 duty were risk factors for anxiety. ISI scores ≥8 was observed in <35 years, unmarried, those with stress because of COVID-19, fear of loneliness, issues of food and accommodation, increased working hours and with GAD-7 score ≥5. Adjusted odd's ratio of insomnia in participants having GAD-7 score ≥5 was 10.499 (95% confidence interval 6.097-18.080; P < 0.001). CONCLUSION: The majority of anaesthesiologists on COVID-19 duty suffer from anxiety and insomnia. Addressing risk factors identified during this study with targeted interventions and psychosocial support will help them to cope better with the stress.