The impact of methylphenidate treatment on the functional and structural properties of the left ventricle: A medium-term prospective study

Introduction: Although methylphenidate (MPH) used for treatment of attention deficit hyperactivity disorder (ADHD) are considered safe in healthy children and adolescents in the short and medium term, there is a widespread concern about long-term cardiovascular safety. Material and methods: Interventional, prospective, longitudinal and comparative study with a crossover design to evaluate the cardiovascular impact of the treatment with MPH in healthy children and adolescents diagnosed with ADHD. A protocol for the cardiovascular evaluation was established at a basal point, after the first and the second year of the beginning with treatment based on the monitoring of blood pressure (BP) and echocardiographic follow-up of the systolic and diastolic functions, and structural cardiac properties. Results: 73 patients completed the study, with an average age of 9 ± 2.6 years, 75.3% were male and the majority were thin (64.4%). We found an increase in Systolic and Diastolic BP of 3.7 ± 9 mmHg (P = 0.004) and 2 ± 11,5 mmHg respectively. There were no severe cardiovascular events. We didn’t find any echocardiographic alterations namely on the structural properties or parameters of systolic function. Regarding diastolic function, a significant increase in the isovo-lumic relaxation time (IVRT) (P = 0.046) and deceleration time (P = 0.016) was observed. However, no significant alterations in the parameters related to distensibility of the LV neither in the early diastolic pressure were found. Conclusion: Further studies are needed to evaluate the impact of psychostimulants as a modifiable long-term Cardiovascular Risk Factor. Resumen: Introducción: El metilfenidato (MTF) es un psicoestimulante que aumenta frecuencia cardiaca (FC) y presión arterial (PA), lo cual a largo plazo podría modificar la geometría del ventrículo izquierdo (VI) y alterar sus propiedades funcionales, principalmente la diastólica. Material y métodos: Estudio prospectivo, longitudinal y comparativo tipo caso-caso en niños y adolescentes sanos diagnosticados de trastorno por déficit de atención e hiperactividad (TDAH) tratados con MTF durante 3 años. Se valoró pre y postratamiento PAS/PAD, geometría ventricular, función sistólica y diastólica. Resultados: Incluimos a 112 pacientes, completando 73. El 75,3% varones, entre 4–15 años (9 ± 2,6), con índice de masa corporal de 18,27 ± 3,75 y una dosis media de MTF de 0,9 ± 0,17 mg/kg/día. Objetivamos aumento de PAS/PAD de 3,7 ± 9 mmHg (p = 0,004) y 2 ±