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  • Title: Treatment of attention-deficit/hyperactivity disorder.
    Author: Jadad AR, Boyle M, Cunningham C, Kim M, Schachar R.
    Journal: Evid Rep Technol Assess (Summ); 1999 Nov; (11):i-viii, 1-341. PubMed ID: 10790990.
    Abstract:
    OBJECTIVES: To determine (a) the long-term and short-term effectiveness and safety of pharmacological and nonpharmacological interventions for attention-deficit/hyperactivity disorder (ADHD) in children and adults and (b) whether combined interventions are more effective than individual interventions. SEARCH STRATEGY: MEDLINE (from 1966), CINAHL (from 1982), HEALTHStar (from 1975), PsycINFO (from 1984), EMBASE (from 1984), and the Cochrane Library searches were completed in November 1997. Reference lists of eligible studies and files of members of the research team and partner organizations were also searched. SELECTION CRITERIA: Studies were selected if they focused on the treatment of ADHD in humans and were published in any language as a full report in peer-reviewed journals. Studies including conditions other than ADHD were reported if separate subgroup analyses for patients with ADHD were provided. DATA COLLECTION AND ANALYSIS: Two reviewers independently extracted data for 41 variables on general characteristics, along with detailed information on interventions, outcomes, and tests. Differences were resolved by consensus or by a third researcher. Studies were not combined quantitatively because the quality of reporting was low and heterogeneity existed across outcome measures and tests. MAIN RESULTS: Seventy-eight studies (77 randomized controlled trials) met the inclusion criteria. Twenty-three studies compared drugs and showed few, if any, differences among methylphenidate (MPH), dextroamphetamine (DEX), and pemoline; studies comparing stimulants with tricyclic antidepressants (2) were inconclusive. Six studies compared drugs with nondrug interventions and showed consistently that stimulants, particularly MPH, may be more effective than nonpharmacological interventions. Twenty studies compared combination therapies with a stimulant or a nondrug intervention alone; no additional beneficial effects for combination therapies were shown. Nine studies compared tricyclic antidepressants with placebo and showed that desipramine may be more effective than placebo; no consistent effect was shown for imipramine. Fourteen studies (13 in school children and 1 in adults) evaluated long-term therapy (> or = 12 weeks) and showed a trend to general improvement regardless of treatment, but the length of followup was inadequate. MPH may reduce behavioral disturbance in children with ADHD while it is taken. Academic performance does not appear to be improved with stimulants. Twelve studies evaluated treatment in adults with ADHD. For MPH vs. placebo, the results were contradictory. Antidepressants may be effective in adults, but no beneficial effect was seen with pemoline, nicotine, or phenylalanine compared with placebo. Thirty-two reports (29 studies) evaluated adverse effects of drug therapy; many of the side effects associated with stimulant use appear to be relatively mild and of short duration and to respond to dosing or timing adjustments. Data are inadequate on the long-term effects and severity of adverse effects of most interventions. CONCLUSIONS: This report describes rigorous systematic reviews on the treatment of ADHD, ready for incorporation into evidence-based clinical practice guidelines or performance measures. The report also provides a detailed description of the many limitations of the evidence available and provides recommendations to fill existing knowledge gaps. Studies on ADHD have low reporting quality, methodological flaws, and heterogeneity across outcome measures and tests. A detailed description is included of the many limitations of the available evidence plus recommendations to fill existing knowledge gaps. Fulfilling such knowledge gaps will not be easy and will require genuine collaboration among decisionmakers.
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