Course and Treatment Outcomes of ADHD
Course and Treatment Outcomes of ADHD
Recent studies provide clinically relevant information related to the course and treatment outcomes of ADHD in children and adolescents. In the longest controlled prospective study of childhood ADHD, Klein and colleagues1 (2012) examined clinical and functional outcomes in adulthood. Study participants were boys aged 6 to 12 years (mean age 8.3 years) who had ADHD at the start of the study. The control group consisted of boys without ADHD; 135 men with ADHD in childhood (65.2% of original sample) and 136 men without ADHD (76.4% of original sample) participated in the follow up study. The follow up period was 33 years with a mean age of 41 years.
Study results showed that compared with men without childhood ADHD, men with childhood ADHD had higher rates of ongoing ADHD (22.2% vs 5.1%), antisocial personality disorder (16.3% vs 0%), substance use disorders (14.1% vs 5.1%), and psychiatric hospitalizations (24.4% vs 6.6%). There were no differences between these groups in prevalence of alcohol disorders, mood disorders, and anxiety disorders. Men with childhood ADHD also had lower educational levels (mean 2.5 less years), lower occupational achievement, lower socioeconomic status, lower social functioning, higher divorce rates, more incarcerations, and higher mortality. Based on these long-term outcomes, the investigators emphasize the importance of monitoring and treating children with ADHD. (see Infographic)
ADHD has been associated with criminal behavior. Lichtenstein and colleagues2 examined the effects of treatment with ADHD medication on criminality. Information was obtained from the Swedish national registers on 25,656 patients who had a diagnosis of ADHD, their medication treatment and criminal convictions. The rates of criminal behavior were compared when the patients were being treated for ADHD and when these same patients were not being treated for ADHD.
For men with ADHD, there was a 32% reduction in criminality and for women with ADHD there was a 41% reduction in criminality when receiving medication. The rates of criminality were the same whether the ADHD medication was a stimulant or nonstimulant. The authors conclude that medication treatment for ADHD may reduce the risk for criminal behavior in individuals with ADHD.
Cigarette smoking is also associated with ADHD. Hammerness and colleagues3 conducted a study of 154 adolescents with ADHD to determine whether stimulants reduce the risk for cigarette smoking. The comparison groups were a naturalistic sample of ADHD and non-ADHD youth. Cigarette smoking was assessed by a self-report questionnaire that measured smoking behavior and physiological dependence to nicotine. Urine assays for cotinine, a metabolite of nicotine, were obtained for adolescents in the clinical trial. Doses of extended-release methylphenidate were based on clinical response and the mean endpoint dose was 61 mg daily.
The rate of smoking in youths who received stimulant treatment was significantly lower than in the unmedicated ADHD comparison group (7.1% vs 19.6%). The rate of smoking in the stimulant treated adolescents was similar to the comparison group of non-ADHD youth and ADHD youth currently on medication (7.1% vs 8.0% vs 10.9%). The investigators recognize that these positive results are preliminary and recommend a randomized clinical trial.
There is a large evidence base supporting the efficacy of stimulant treatment for children and adolescents with ADHD, however some parents prefer nonmedication treatment for their child. Duric and colleagues4 examined the efficacy of neurofeedback for the treatment of children and adolescents with ADHD. The aim of neurofeedback is to enhance beta and depress theta activity as assessed by EEG.