The purpose of a study was to determine whether stimulant users are at higher risk of a later cardiovascular event than are non-users, examining this association in both a national cohort and a population-based sample of children and adolescents diagnosed with attention-deficit hyperactivity disorder ( ADHD ).
Researchers have also aimed to examine a possible dose-response relationship in such an association.
Researchers have conducted a longitudinal, prospective cohort study of all children born in Denmark between 1990 and 1999. Within this cohort, children with ADHD were identified.
Data from national health registers on psychiatric and somatic diagnoses, stimulant prescriptions, cardiovascular risk factors, pre- and perinatal and sociodemographic covariates in all children and their parents were merged, using the unique personal identification number.
In the total population ( n=714,258 contributing a total of 6,767,982 person-years ) use of stimulants increased the risk of a cardiovascular event; adjusted hazard ratio, HR=1.83.
In children with ADHD ( n=8300 ) stimulant treatment also increased the risk of a cardiovascular event ( adjusted HR=2.20 ), with a complex time-dependent dose-response relationship.
In conclusion, this is the first nationwide cohort study of the cardiovascular safety of stimulants in children and adolescents, and it represents the longest prospective follow-up study.
Cardiovascular events were rare but twice as likely in stimulant users as in non-users, both in the total national population and in children with ADHD.
Researchers found a complex, time- and dose-dependent interrelationship between cardiovascular adverse events and stimulant treatment in children and adolescents.
The results suggest a safety signal with an increased risk of cardiovascular disease associated with stimulant treatment in children and adolescents, even after adjusting for a number of potential confounders. ( Xagena )
Dalsgaard S et al, J Child Adolesc Psychopharmacol 2014; Ahead of print