Microvascular reactivity in lean, overweight, and obese hypertensive adolescents

Péter Monostori, Ákos Baráth, Ildikó Fazekas, Eszter Hódi, Adrienn Máté, Ildikó Farkas, Zsuzsanna Hracskó, Ilona S. Varga, Viktória Sümegi, Balázs Gellén, Csaba Bereczki, Sándor Túri

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Abstract

The microvascular responses to endothelium-dependent vasodilators (e.g., acetylcholine), endothelium-independent vasodilators (e.g., sodium nitroprusside), and to local heating were studied (for the first time) in adolescents with essential hypertension, grouped according to their body mass index. The forearm microvascular reactivities of thirty-three hypertensive adolescents (ten lean, 13 overweight, and ten obese) and 19 healthy controls were assessed by means of laser Doppler flowmetry. Blood levels of enzymatic and nonenzymatic antioxidants and malondialdehyde were determined. The perfusion increments in response to acetylcholine iontophoresis were not significantly attenuated in the patient groups as compared with the controls. Sodium nitroprusside (SNP) iontophoresis resulted in significantly smaller perfusion increments in the lean and obese hypertensives than in the controls (both p∈<∈0.05). Similar responses to local heating (44°C) performed after either acetylcholine or SNP iontophoresis were observed at the respective measurement sites. As compared with the controls, we found elevated ratios of the whole blood oxidized and reduced glutathione in all the patient groups (all p∈<∈0.001), increased erythrocyte catalase activities in the overweight hypertensives (p∈<∈0.05), and decreased ratios of the plasma alpha-tocopherol and triglycerides in the obese hypertensive group (p∈<∈0.05). Conclusion: The endothelium-dependent microvascular reactivity was not significantly attenuated in the hypertensive adolescents in contrast with the impaired endothelium-independent vasorelaxation in the lean and obese hypertensives.

Original languageEnglish
Pages (from-to)1369-1374
Number of pages6
JournalEuropean Journal of Pediatrics
Volume169
Issue number11
DOIs
Publication statusPublished - Nov 1 2010

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Keywords

  • Child
  • Endothelium
  • Juvenile essential hypertension
  • Laser Doppler flowmetry
  • Microvascular dysfunction
  • Oxidative stress

ASJC Scopus subject areas

  • Pediatrics, Perinatology, and Child Health

Cite this

Monostori, P., Baráth, Á., Fazekas, I., Hódi, E., Máté, A., Farkas, I., Hracskó, Z., Varga, I. S., Sümegi, V., Gellén, B., Bereczki, C., & Túri, S. (2010). Microvascular reactivity in lean, overweight, and obese hypertensive adolescents. European Journal of Pediatrics, 169(11), 1369-1374. https://doi.org/10.1007/s00431-010-1234-3