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Cardiovascular Drugs and Therapy

, Volume 20, Issue 2, pp 129–134 | Cite as

Reduced Hemodynamic Responses to Physical and Mental Stress Under Low-Dose Rilmenidine in Healthy Subjects

  • Renata Rodrigues Teixeira de Castro
  • Eduardo Tibiriçá
  • Marcos Aurélio Brazão de Oliveira
  • Paula Barbosa Baptista Moreira
  • Marcelo Flores Catelli
  • Nazareth Novaes Rocha
  • Antonio C. L. Nóbrega
Clinical Pharmacology and Drug Studies

Summary

Activation of the sympathetic nervous system plays a major role in the pathogenesis and prognosis of cardiovascular diseases. Rilmenidine is an I1-imidazoline receptor agonist that reduces blood pressure by modulation of central sympathetic activity, but the effects of low-dose rilmenidine on the hemodynamic responses to physiological maneuvers that increase adrenergic drive is not known. To assess the effects of low-dose rilmenidine on the hemodynamic responses to stress, 32 healthy subjects (20–56 years old) underwent acute physical exercise (n = 15, individualized ramp protocol on treadmill) and mental stress (n = 17, word color Stroop and mental arithmetics tests) two hours after the oral administration of 0.5 mg of rilmenidine (RIL) or placebo (PLA) following a randomized, double-blind, placebo controlled crossover study. No subject complained of any side effect. Rilmenidine reduced peak exercise heart rate (PLA: 187 ± 7; RIL: 181 ± 9 bpm; P = 0.003), but did not modify peak aerobic power (VO2max — PLA: 41.7 ± 6.2; RIL: 42.3 ± 6.7 ml/kg/min; P = 0.26). During mental stress, rilmenidine inhibited the peak systolic (PLA: 123 ± 10; RIL: 114 ± 8 mmHg; P = 0.02) and diastolic (PLA: 86 ± 7; RIL: 81 ± 7 mmHg; P <0.05) blood pressure responses. In conclusion, rilmenidine reduced the hemodynamic response to physical and mental stress stimuli without limiting exercise capacity. These results support the concept that rilmenidine, at a dose lower than the ones recommended to treat hypertension, reduced the myocardial oxygen demand to stress and may carry potential clinical impact.

Key Words

rilmenidine exercise test mental stress sympathetic activity 

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Copyright information

© Springer Science + Business Media, LLC 2006

Authors and Affiliations

  • Renata Rodrigues Teixeira de Castro
    • 1
  • Eduardo Tibiriçá
    • 2
  • Marcos Aurélio Brazão de Oliveira
    • 3
  • Paula Barbosa Baptista Moreira
    • 3
  • Marcelo Flores Catelli
    • 2
  • Nazareth Novaes Rocha
    • 1
  • Antonio C. L. Nóbrega
    • 1
  1. 1.Departament of Physiology and PharmacologyInstituto Biomédico, Universidade Federal FluminenseBrazil
  2. 2.Departament pf Physiology and PharmacodynamicsInstituto Oswaldo CruzFIOCRUZBrazil
  3. 3.Post-Graduate Studies in Cardiovascular SciencesUniversidade Federal FluminenseNiteróiBrazil

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