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A pilot study: differential effects of methylphenidate-OROS on working memory and attention functions in children with attention-deficit/hyperactivity disorder with and without behavioural comorbidities

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ADHD Attention Deficit and Hyperactivity Disorders

Abstract

To examine the effects of methylphenidate-OROS (MPH-OROS) on working memory (WM) and attention functions in children with attention-deficit hyperactivity disorder (ADHD), and to investigate whether there is a differential effect in ADHD children with (ADHD+) and without (ADHD−) behavioural comorbidities. Participants included a clinic referred sample of 12 stimulant naïve school-aged children with a diagnosis of combined ADHD according to the DSM-IV criteria (6 ADHD+, 6 ADHD−), and 11 healthy children. A neuropsychological protocol was applied at three different moments: before treatment, after one those of MPH-OROS, and after one month of MPH-OROS daily treatment. The protocol was simultaneously administered to the control group. Initial differences in attention parameters between naïve children with ADHD and the control group disappeared after the first dose of MPH-OROS. For WM, one month of daily treatment was necessary to achieve this pattern of results. Both ADHD groups (ADHD+ and ADHD−) showed these differences, but there was a greater improvement in (ADHD−). MPH-OROS had an immediate effect on attention deficits, but long-term treatment was needed to improve WM to the level of healthy subjects. The presence of comorbid behavioural conditions determined a less robust response in neuropsychological performance to stimulant treatment.

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Authors and Affiliations

  1. Psychiatry Service, Child and Adolescent Unit, Hospital Universitario de Canarias, 38001, Tenerife, Spain

    Belén Rubio

  2. Department of Psychobiology and Methodology of Behavioural Sciences, School of Psychology, University of La Laguna, Tenerife, Spain

    Sergio Hernández, Emilio Verche, Raquel Martín & Pedro González-Pérez

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  1. Belén Rubio
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  2. Sergio Hernández
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  3. Emilio Verche
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  4. Raquel Martín
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  5. Pedro González-Pérez
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Correspondence to Belén Rubio.

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Rubio, B., Hernández, S., Verche, E. et al. A pilot study: differential effects of methylphenidate-OROS on working memory and attention functions in children with attention-deficit/hyperactivity disorder with and without behavioural comorbidities. ADHD Atten Def Hyp Disord 3, 13–20 (2011). https://doi.org/10.1007/s12402-010-0035-x

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