Transcranial direct current stimulation (tDCS) is a non-invasive brain stimulation technique with... more Transcranial direct current stimulation (tDCS) is a non-invasive brain stimulation technique with substantial evidence for its safety and tolerability in adults. However, less than 5% of published tDCS research is in pediatrics. Our primary objective was to investigate tDCS safety, tolerability, and acceptability in a sample of children and adults. We hypothesized that children and adults would be equal with regard to tDCS safety, tolerability, and acceptability. We tested this hypothesis using a Bayesian approach. Sixty participants aged 6–45 (balanced for sex) participated in a randomized double-blind controlled trial. They were randomly assigned to two ten-minute tDCS sessions with varying amperages and electrode locations. The primary outcome measure of this study was the intensity of 13 potential side effects evaluated at six different time points spanning two weeks. Independent sample Bayes factor tests were conducted between children/adults, males/females, clinical/healthy, a...
This study focused on children treated for mental health problems during the pandemic. We examine... more This study focused on children treated for mental health problems during the pandemic. We examined how parent’s difficulties in managing COVID-19 restrictions increased children's behavioral problems (internalizing and externalizing) and parent-child conflict through parental mental health and parental stress. Family functioning, particularly problem-solving ability, was tested as a resilience factor. Data were collected using online surveys from 337 parents with a child between the ages of 4 and 18 years who was receiving active outpatient mental health treatment at a pediatric tertiary care center. Parents who reported a greater impact of COVID-19 reported more behavioral difficulties in their children. This relationship was significantly mediated by parental mental health (general stress, anxiety, and depression) and parental stress. Similar indirect pathways were observed when examining internalizing and externalizing problems in children, where the most significant pathway ...
BACKGROUND Childhood cancer survivors should be routinely screened for psychological distress. Ho... more BACKGROUND Childhood cancer survivors should be routinely screened for psychological distress. However, existing screening tools promoted by cancer care institutions, such as the Distress Thermometer (DT) generate high rates of errors. The aim of this study is to help refining strategies of screening psychological distress in this population by exploring two-step methods combining the DT on step #1 with one question on step #2. PROCEDURE Data from 255 survivors of childhood acute lymphoblastic leukemia aged 13-40 years were analyzed (38% 13-18 years, 62% 19+ years, 53% females). We used the DT on step #1 and the individual emotion items from the Pediatric Quality of Life Questionnaire (PedsQL) on step #2, to detect distress, depression and anxiety as measured by standard instruments. We compared sensitivity, specificity, negative and positive predictive values, Youden index, and clinical utility indices, in newly developed two-step strategies. RESULTS The best two-step strategies to screen anxious-depressive distress were DT ≥ 2 on step #1, with the item of Sadness on step #2, and DT ≥ 2 combined with the item of Concerns. Two-step strategies outperformed the DT alone on the correct identification of distressed survivors. However, two-step strategies did not outperform the DT used alone on the correct detection of no distressed survivors. Results were similar when predicting depression or anxiety alone. CONCLUSION Completing the DT with one single question on emotions from the PedsQL may minimize the number of participants falsely identified as distressed, which could be particularly pertinent in resource-limited clinics.
Operation Installation In a previous study of house fire-related deaths and injuries in Dallas, T... more Operation Installation In a previous study of house fire-related deaths and injuries in Dallas, TX, we had performed calculations of rates of these deaths and injuries for every census tract in Dallas for 1991-1997. 1 That study and others showed that house fire-related deaths and injuries were highest in the census tracts with lowest median income, 1-5 and in houses without functioning smoke alarms. 6, 7 To address this problem, we began a joint effort along with the Dallas Fire Rescue Department, to install smoke alarms in houses in high-risk census tracts in Dallas through a program called " Operation Installation " (OI). Ongoing surveillance allowed us to evaluate the impact of OI on rates of house fire-related deaths and injuries for residents of the houses that received smoke alarms through OI, compared to the rate in residents of houses in the same census tracts that did not receive a smoke alarm through OI. Operation Installation has been a joint project of the Inj...
Journal of Pharmacokinetics and Pharmacodynamics, 2020
Levodopa is considered the gold standard treatment of Parkinson’s disease. Although very effectiv... more Levodopa is considered the gold standard treatment of Parkinson’s disease. Although very effective in alleviating symptoms at their onset, its chronic use with the progressive neuronal denervation in the basal ganglia leads to a decrease in levodopa’s effect duration and to the appearance of motor complications. This evolution challenges the establishment of optimal regimens to manage the symptoms as the disease progresses. Based on up-to-date pathophysiological and pharmacological knowledge, we developed an integrative model for Parkinson’s disease to evaluate motor function in response to levodopa treatment as the disease progresses. We combined a pharmacokinetic model of levodopa to a model of dopamine’s kinetics and a neurocomputational model of basal ganglia. The parameter values were either measured directly or estimated from human and animal data. The concentrations and behaviors predicted by our model were compared to available information and data. Using this model, we were able to predict levodopa plasma concentration, its related dopamine concentration in the brain and the response performance of a motor task for different stages of disease.
Transcranial direct current stimulation (tDCS) is a novel treatment option for attention deficit ... more Transcranial direct current stimulation (tDCS) is a novel treatment option for attention deficit hyperactivity disorder. To facilitate translation into clinical practice, we interviewed parents of children who have experienced experimental tDCS. A grounded theory approach using open, axial, and selective coding provided seven emergent themes for acceptability: tDCS provides hope for parents, safety tolerability and side effects of tDCS versus medication, burden of treatment, education and trust with care providers, cost and coverage, unestablished tDCS efficacy versus established medication effectiveness, perceived compliance of tDCS versus medication. Results suggest tDCS is acceptable but depends on evidence of effectiveness and regular availability.
Transcranial direct current stimulation (tDCS) is a non-invasive brain stimulation technique with... more Transcranial direct current stimulation (tDCS) is a non-invasive brain stimulation technique with substantial evidence for its safety and tolerability in adults. However, less than 5% of published tDCS research is in pediatrics. Our primary objective was to investigate tDCS safety, tolerability, and acceptability in a sample of children and adults. We hypothesized that children and adults would be equal with regard to tDCS safety, tolerability, and acceptability. We tested this hypothesis using a Bayesian approach. Sixty participants aged 6–45 (balanced for sex) participated in a randomized double-blind controlled trial. They were randomly assigned to two ten-minute tDCS sessions with varying amperages and electrode locations. The primary outcome measure of this study was the intensity of 13 potential side effects evaluated at six different time points spanning two weeks. Independent sample Bayes factor tests were conducted between children/adults, males/females, clinical/healthy, a...
This study focused on children treated for mental health problems during the pandemic. We examine... more This study focused on children treated for mental health problems during the pandemic. We examined how parent’s difficulties in managing COVID-19 restrictions increased children's behavioral problems (internalizing and externalizing) and parent-child conflict through parental mental health and parental stress. Family functioning, particularly problem-solving ability, was tested as a resilience factor. Data were collected using online surveys from 337 parents with a child between the ages of 4 and 18 years who was receiving active outpatient mental health treatment at a pediatric tertiary care center. Parents who reported a greater impact of COVID-19 reported more behavioral difficulties in their children. This relationship was significantly mediated by parental mental health (general stress, anxiety, and depression) and parental stress. Similar indirect pathways were observed when examining internalizing and externalizing problems in children, where the most significant pathway ...
BACKGROUND Childhood cancer survivors should be routinely screened for psychological distress. Ho... more BACKGROUND Childhood cancer survivors should be routinely screened for psychological distress. However, existing screening tools promoted by cancer care institutions, such as the Distress Thermometer (DT) generate high rates of errors. The aim of this study is to help refining strategies of screening psychological distress in this population by exploring two-step methods combining the DT on step #1 with one question on step #2. PROCEDURE Data from 255 survivors of childhood acute lymphoblastic leukemia aged 13-40 years were analyzed (38% 13-18 years, 62% 19+ years, 53% females). We used the DT on step #1 and the individual emotion items from the Pediatric Quality of Life Questionnaire (PedsQL) on step #2, to detect distress, depression and anxiety as measured by standard instruments. We compared sensitivity, specificity, negative and positive predictive values, Youden index, and clinical utility indices, in newly developed two-step strategies. RESULTS The best two-step strategies to screen anxious-depressive distress were DT ≥ 2 on step #1, with the item of Sadness on step #2, and DT ≥ 2 combined with the item of Concerns. Two-step strategies outperformed the DT alone on the correct identification of distressed survivors. However, two-step strategies did not outperform the DT used alone on the correct detection of no distressed survivors. Results were similar when predicting depression or anxiety alone. CONCLUSION Completing the DT with one single question on emotions from the PedsQL may minimize the number of participants falsely identified as distressed, which could be particularly pertinent in resource-limited clinics.
Operation Installation In a previous study of house fire-related deaths and injuries in Dallas, T... more Operation Installation In a previous study of house fire-related deaths and injuries in Dallas, TX, we had performed calculations of rates of these deaths and injuries for every census tract in Dallas for 1991-1997. 1 That study and others showed that house fire-related deaths and injuries were highest in the census tracts with lowest median income, 1-5 and in houses without functioning smoke alarms. 6, 7 To address this problem, we began a joint effort along with the Dallas Fire Rescue Department, to install smoke alarms in houses in high-risk census tracts in Dallas through a program called " Operation Installation " (OI). Ongoing surveillance allowed us to evaluate the impact of OI on rates of house fire-related deaths and injuries for residents of the houses that received smoke alarms through OI, compared to the rate in residents of houses in the same census tracts that did not receive a smoke alarm through OI. Operation Installation has been a joint project of the Inj...
Journal of Pharmacokinetics and Pharmacodynamics, 2020
Levodopa is considered the gold standard treatment of Parkinson’s disease. Although very effectiv... more Levodopa is considered the gold standard treatment of Parkinson’s disease. Although very effective in alleviating symptoms at their onset, its chronic use with the progressive neuronal denervation in the basal ganglia leads to a decrease in levodopa’s effect duration and to the appearance of motor complications. This evolution challenges the establishment of optimal regimens to manage the symptoms as the disease progresses. Based on up-to-date pathophysiological and pharmacological knowledge, we developed an integrative model for Parkinson’s disease to evaluate motor function in response to levodopa treatment as the disease progresses. We combined a pharmacokinetic model of levodopa to a model of dopamine’s kinetics and a neurocomputational model of basal ganglia. The parameter values were either measured directly or estimated from human and animal data. The concentrations and behaviors predicted by our model were compared to available information and data. Using this model, we were able to predict levodopa plasma concentration, its related dopamine concentration in the brain and the response performance of a motor task for different stages of disease.
Transcranial direct current stimulation (tDCS) is a novel treatment option for attention deficit ... more Transcranial direct current stimulation (tDCS) is a novel treatment option for attention deficit hyperactivity disorder. To facilitate translation into clinical practice, we interviewed parents of children who have experienced experimental tDCS. A grounded theory approach using open, axial, and selective coding provided seven emergent themes for acceptability: tDCS provides hope for parents, safety tolerability and side effects of tDCS versus medication, burden of treatment, education and trust with care providers, cost and coverage, unestablished tDCS efficacy versus established medication effectiveness, perceived compliance of tDCS versus medication. Results suggest tDCS is acceptable but depends on evidence of effectiveness and regular availability.
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