[Carotid and brachial intima-media thickness of the allelic variants G894T and T-789C of eNOS in systemic sclerosis patients]

Rev Med Inst Mex Seguro Soc. 2015:53 Suppl 1:S46-52.
[Article in Spanish]

Abstract

Objective: To evaluate comparatively the carotid intima media thickness index (IMT) and brachial index with Doppler ultrasound, and pulmonary artery pressure with echocardiography in allelic variation of G894T and T-789C eNOS (endothelial nitric oxide synthase) in patients with systemic sclerosis.

Methods: This is a cross-sectional study in patients with scleroderma. The inclusion criteria were: age 18-70 years, scleroderma diagnosed patients with a prior informed consent. Polymorphism G894T and T-789C of eNOS was measured in blood, and IMT by carotid and brachial Doppler. We analyzed with descriptive statistics, Student's t test or chi square for association of variables and Spearman to correlate Doppler parameters.

Results: We found abnormally high IMT in carotid and brachial arteries. We also observed low correlation between both brachial arteries, good correlation between carotids and no correlation between carotid and brachial arteries. The left IMT>0.65 mm in brachial artery corresponds to pulmonary pressure>30 mmHg by echocardiography. G894T gene polymorphism was associated with increased IMT in right carotid.

Conclusion: The G894T eNOS polymorphism was associated with increased IMT in right carotid. The one side carotid IMT is consistent with its contralateral. The left brachial IMT above to 0.65 mm, suggests the possibility of pulmonary arterial hypertension.

Introducción: el objetivo de este estudio es evaluar comparativamente el grosor íntima-media (IMT) carotídeo y braquial con ultrasonido Doppler, la presión arterial pulmonar ecocardiográfica y la variación alélica de los genes G894T y T-789C de la eNOS en pacientes con esclerodermia. Métodos: estudio transversal en pacientes con esclerodermia. Criterios de inclusión: edad 18-70 años, diagnosticado con esclerodermia, previo consentimiento informado. Se evaluó IMT, índice de resistencia (IR) e índice de pulsatilidad (IP) mediante Doppler carotídeo y braquial, perfil de lípidos, proteína C reactiva, polimorfismo G894T y T-789C de óxido nítrico sin tasa endotelial (eNOS). Analizamos con estadística descriptiva, prueba t de Student o chi cuadrada para asociación de variables y Spearman para correlacionar las variables cuantitativas. Resultados: encontramos IMT anormalmente alto en arterias carotídeas y braquiales. Observamos baja correlación entre ambas braquiales, buena correlación entre carótidas y ninguna correlación entre carótidas y braquiales. El IMT braquial izquierdo > 0.65 corresponde con presión arteria pulmonar > 30 mmHg ecocardiográfica. El polimorfismo del gen G894T se asoció con mayor IMT en carótida derecha.Conclusión: El polimorfismo G894T de eNOS se asocia a mayor IMT en carótida derecha. El IMT carotídeo concuerda con su IMT contralateral. El IMT braquial izquierdo mayor a 0.65 sugiere la posibilidad de hipertensión arterial pulmonar.

Keywords: Atherosclerosis; Carotid and brachial IMT; Systemic sclerosis.

Publication types

  • Comparative Study

MeSH terms

  • Adolescent
  • Adult
  • Aged
  • Atherosclerosis / diagnostic imaging
  • Atherosclerosis / etiology
  • Atherosclerosis / genetics*
  • Brachial Artery / diagnostic imaging
  • Brachial Artery / physiopathology*
  • Carotid Intima-Media Thickness*
  • Cross-Sectional Studies
  • Echocardiography
  • Female
  • Genetic Markers
  • Humans
  • Hypertension, Pulmonary / diagnostic imaging
  • Hypertension, Pulmonary / etiology
  • Hypertension, Pulmonary / genetics
  • Male
  • Middle Aged
  • Nitric Oxide Synthase Type III / genetics*
  • Polymorphism, Single Nucleotide*
  • Scleroderma, Systemic / genetics
  • Scleroderma, Systemic / physiopathology*
  • Ultrasonography, Doppler
  • Young Adult

Substances

  • Genetic Markers
  • NOS3 protein, human
  • Nitric Oxide Synthase Type III