Adults with ADHD are at an increased risk of a wide range of physical conditions, including nervous system, respiratory, musculoskeletal, and metabolic diseases, according to a large register-based study from Karolinska Institutet in Sweden.
The findings of the study were published in the journal The Lancet Psychiatry.
“Identifying co-occurring physical diseases may have important implications for treating adults with ADHD and for benefiting the long-term health and quality of life of patients,” said lead author Ebba Du Rietz, and postdoctoral researcher at the Department of Medical Epidemiology and Biostatistics, Karolinska Institutet.
ADHD is a common neuropsychiatric disorder characterized by inattention, impulsiveness and hyperactivity. It is commonly treated with stimulant therapy (methylphenidates or amphetamines).
Previous studies suggest increased risk for a number of physical health conditions in adults with ADHD, but only a limited number of these associations have been thoroughly researched. Moreover, detailed treatment guidelines for adults with ADHD and co-occurring physical disease are largely lacking.
Now, researchers at Karolinska Institutet have examined possible associations between ADHD and a wide range of physical diseases in adulthood. Also, whether genetic or environmental factors are involved.
Over 4 million individuals (full-sibling and maternal half-sibling pairs) born between 1932-1995 were identified through Swedish registers and followed between 1973-2013.
Clinical diagnoses were obtained from the Swedish National Patient Register. The researchers examined the risk of 35 physical conditions in individuals with ADHD, compared to those without, and in siblings of individuals with ADHD compared to siblings of those without.
Individuals with ADHD had a statistically significant increased risk of all studied physical conditions except arthritis. The strongest associations were found for nervous system, respiratory, musculoskeletal and metabolic diseases.
The diagnoses most strongly associated with ADHD were alcohol-related liver disease, sleep disorders, chronic obstructive pulmonary disease (COPD), epilepsy, fatty liver disease and obesity. ADHD was also linked to a slightly increased risk of cardiovascular disease, Parkinson’s disease and dementia.
“These results are important because stimulant therapy requires careful monitoring in ADHD patients with co-occurring cardiac disease, hypertension and liver failure,” said senior author Henrik Larsson, professor at Orebro University and affiliated researcher at Karolinska Institutet.
The increased risk was largely explained by underlying genetic factors that contributed both to ADHD and the physical disease, except for nervous system disorders and age-related diseases. Full siblings of individuals with ADHD had significantly increased risk for most physical conditions.
The researchers now aim to study the underlying mechanisms and risk factors as well as the impact of ADHD on the management and prognosis of physical diseases in adults.
(With inputs from ANI)
(Edited by Fern Siegel and Judith Isacoff)
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