Heart rate variability and methylphenidate in children with ADHD
Reiner Buchhorn1, Annette Conzelmann, Christian Willaschek
1Department of Paediatrics, Caritas Krankenhaus, Bad Mergentheim, Germany. reiner.buchhorn@ckbm.de
Attention Deficit and Hyperactivity Disorders
|February 14, 2012
Summary
Methylphenidate (MPH) treatment for attention deficit/hyperactivity disorder (ADHD) appears to improve heart rate variability (HRV) and autonomic activation in children. This pilot study found MPH ameliorated decreased vagal tone and higher heart rates observed in unmedicated ADHD patients.
Area of Science:
- Pediatric Cardiology
- Neuroscience
- Autonomic Nervous System Function
Background:
- Stimulant medications are widely used for attention deficit/hyperactivity disorder (ADHD).
- Concerns exist regarding the cardiovascular safety of these ADHD treatments.
- Heart rate variability (HRV) analysis may offer insights into therapy control and cardiovascular effects.
Purpose of the Study:
- To investigate if time-domain HRV analysis in children with ADHD under methylphenidate (MPH) medication provides new information on therapy control.
- To assess the impact of MPH on HRV parameters and heart rate in children with ADHD.
- To compare HRV in ADHD children with and without MPH treatment to healthy controls.
Main Methods:
- Collected 24-h ECG recordings from 23 children with ADHD (11 on MPH, 12 unmedicated) and 19 healthy controls.
- Analyzed HRV parameters: standard deviation of normal-to-normal intervals (SDNN), percentage of successive normal NN intervals > 50 ms (pNN50), and root-mean-square of successive differences (rMSSD).
- Conducted hourly analysis of HRV and compared heart rates between groups.
Main Results:
- ADHD children (with and without MPH) had significantly higher mean heart rates than controls.
- Unmedicated ADHD children showed significantly lower pNN50 and rMSSD values, indicating diminished vagal tone.
- MPH treatment appeared to ameliorate these HRV parameters, bringing them closer to control levels, with no negative impact detected.
Conclusions:
- Unmedicated ADHD children exhibit decreased vagal tone and higher heart rates, reflected in diminished HRV.
- Methylphenidate (MPH) treatment in ADHD appears to improve autonomic activation parameters.
- Further research is needed to explore potential cardio-protective effects of MPH in ADHD treatment.
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