Endothelial dysfunction biomarkers in sickle cell disease: is there a role for ADMA and PAI-1?

Within the spectrum of sickle cell disease (SCD) are sickle cell anemia (SCA), presence of hemoglobin SS (HbSS), hemoglobin SC disease (HbSC), and sickle cell ß-thalassemia (Sß-thal). Asymmetric dimethylarginine (ADMA) competitively inhibits the binding of arginine to NOS, reducing NO production. In patients with HbSS, increased levels of ADMA have been reported, as well as changes in many hemostatic biomarkers, including the plasminogen activator inhibitor type 1 (PAI-1). We hypothesized that high levels of ADMA and PAI-1 may be associated with more severe SCD. Thus, ADMA and PAI-1 levels were determined in 78 individuals including 38 adult patients with SCD and 40 control subjects. Higher levels of ADMA were shown in HbSS and Sß-thal patients compared to controls. Concerning PAI-1, all patients showed high levels of PAI-1 compared to controls. As a role of NO in the pathogenesis of SCD has already been established, we concluded that high levels of ADMA should compromise, at least in part, NO synthesis, resulting in endothelial dysfunction. Elevated plasma levels of PAI-1 in all patients may indicate not only endothelial dysfunction but also a hypofibrinolytic state favoring thrombotic complications. Finally, high levels of ADMA and PAI-1 may be associated with more severe SCD.

Avaliação da qualidade de vida de pacientes com Doença Falciforme / Evaluation of the quality of life of patients with Sickle Cell Disease

INTRODUÇÃO: A doença falciforme (DF) compreende um grupo de anemias hemolíticas hereditárias cuja principal característica é a presença do gene da hemoglobina S (Hb S) que pode combinar-se com outras anormalidades sanguíneas hereditárias. O quadro clínico varia desde quase assintomático até formas graves. A Hidroxiuréia (HU) é a terapia de maior sucesso. É uma doença crônica, cuja prevalência e morbidade são altas no Brasil, dessa forma a qualidade de vida (QV) surge como um importante desafio para os pacientes, familiares e profissionais de saúde. OBJETIVOS: Avaliar a QV de pacientes portadores de DF, suas características sociodemográficas e clínicas. MÉTODOS: Os dados foram coletados através do questionário de QV abreviado (WHOQOL-Bref), questionário sociodemográfico e prontuário clínico. RESULTADOS: foram entrevistados 39 pacientes, entre 18 e 54 anos, tratados na Fundação Hemominas em Divinópolis - MG. A maioria dos pacientes eram homens (56%), homozigotos para a Hb S (80%), solteiros (67%), segundo grau completo (31%) e não usuários de HU (61%). Dentre os pacientes avaliados 53,8% considerou ter boa QV (escore médio 74,2 ±20,3). O escore relacionado à QV geral foi de 71,5. Os domínios físico e meio ambiente obtiveram os menores escores médio (61,5 e 59,0, respectivamente). Não foram encontradas diferenças significativas entre os que utilizavam ou não HU. CONCLUSÕES: Os pacientes com DF apresentaram boa QV, sendo mais comprometida pelos aspectos relacionados ao domínio meio ambiente, (como recursos financeiros) e físico (como dor e desconforto) que se correlacionam com as características clínicas e sociais relacionadas a DF.

Introduction: sickle cell disease (SCD) comprises a group of hereditary hemolytic anemias whose main characteristic is the presence of the hemoglobin S (Hb S) gene that can be combined with other hereditary blood abnormalities. The clinical picture ranges from almost asymptomatic to severe forms. Hydroxyurea (HU) is the most successful therapy. It is a chronic disease whose prevalence and morbidity are high in Brazil, thus quality of life (QoL) emerges as an important challenge for patients, family members and health professionals. Objectives: This study aimed to evaluate the QoL of patients with SCD, their sociodemographic and clinical characteristics. Methods: Data were collected through the abbreviated QoL questionnaire (WHOQOL-Bref), sociodemographic questionnaire and clinical chart. Results: It has interviewed at the Hemominas Foundation in Divinópolis - MG, 39 patients aged 18-54. Most of the patients were male (56%), homozygous for Hb S (80%), unmarried (67%), completed high school (31%) and non HU users (61%). Among the patients evaluated, 53.8% considered having a good QoL (mean score 74.2 ± 20.3). The overall QoL score was 71.5. The physical and environmental domains had the lowest mean scores (61.5 and 59.0, respectively). No significant differences were found among those using or not using HU. Conclusions: Patients with SCD presented good QoL, being more affected by aspects related to the environmental domain (such as financial resources) and physical (such as pain and discomfort) those correlate with clinical and social characteristics related to SCD.