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Published on: September 3, 2021
A randomized controlled laboratory study on the long-term effects of methylphenidate on cardiovascular function and
James D Wilkinson1, Ralph Callicott2, William F Salminen3
1Department of Pediatrics, Vanderbilt University School of Medicine, Nashville, TN, 37232, USA.
Background:
Whether long-term methylphenidate (MPH) results in any changes in cardiovascular function or structure can only be properly addressed through a randomized trial using an animal model which permits elevated dosing over an extended period of time.
Methods:
We studied 28 male rhesus monkeys (Macaca mulatta) approximately 7 years of age that had been randomly assigned to one of three MPH dosages: vehicle control (0 mg/kg, b.i.d., n = 9), low dose (2.5 mg/kg, b.i.d., n = 9), or high dose (12.5 mg/kg, b.i.d., n = 10). Dosage groups were compared on serum cardiovascular and inflammatory biomarkers, electrocardiograms (ECGs), echocardiograms, myocardial biopsies, and clinical pathology parameters following 5 years of uninterrupted dosing.
Results:
With the exception of serum myoglobin, there were no statistical differences or apparent dose-response trends in clinical pathology, cardiac inflammatory biomarkers, ECGs, echocardiograms, or myocardial biopsies. The high-dose MPH group had a lower serum myoglobin concentration (979 ng/mL) than either the low-dose group (1882 ng/mL) or the control group (2182 ng/mL). The dose response was inversely proportional to dosage (P = .0006).
Conclusions:
Although the findings cannot be directly generalized to humans, chronic MPH exposure is unlikely to be associated with increased cardiovascular risk in healthy children.
Insights
Long-term methylphenidate (MPH) use in monkeys did not show significant cardiovascular changes. This suggests MPH is unlikely to increase cardiovascular risk in healthy children with extended use.
Area of Science:
- Cardiovascular Science
- Pharmacology
- Toxicology
Background:
- Assessing long-term methylphenidate (MPH) effects on cardiovascular health requires animal models with extended, high-dose studies.
- Previous research has not fully addressed the cardiovascular impact of chronic MPH administration.
Purpose of the Study:
- To investigate the long-term cardiovascular effects of methylphenidate (MPH) in a non-human primate model.
- To evaluate potential changes in cardiac structure, function, and biomarkers following prolonged MPH exposure.
Main Methods:
- 28 male rhesus monkeys received vehicle control, low-dose (2.5 mg/kg b.i.d.), or high-dose (12.5 mg/kg b.i.d.) MPH for 5 years.
- Comprehensive assessments included serum biomarkers, ECGs, echocardiograms, myocardial biopsies, and clinical pathology.
Main Results:
- No significant differences in clinical pathology, cardiac inflammatory biomarkers, ECGs, echocardiograms, or myocardial biopsies were observed across groups.
- Serum myoglobin levels were inversely proportional to MPH dosage, with the high-dose group showing significantly lower concentrations.
Conclusions:
- Chronic methylphenidate (MPH) exposure in this primate model did not lead to adverse cardiovascular structural or functional changes.
- Findings suggest that MPH is unlikely to be associated with increased cardiovascular risk in healthy children during long-term treatment.
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