Metabolic interactions between hyperhomocysteinemia and endothelin-1 among Tunisian patients with acute coronary diseases

BACKGROUND: Acute coronary syndromes (ACS) are complex and polygenic diseases which are a real problem of public health. These syndromes require multidisciplinary studies to understand the pathogenesis mechanisms and metabolic interactions between different risk factors.This study aimed to explore the variation of two coronary risk parameters not mentioned by Framingham cohorts, hyperhomocysteinemia and endothelin-1 (ET-1) in Tunisian coronary and the study of the variation of these parameters based on various cardiac risk factors and metabolic relationship between them.To 157 coronary and 142 healthy subjects, the concentration of homocysteine was quantified by fluorescence polarization immunoassay; the concentration of ET-1 was measured by an analytical technique, the High Performance Liquid Chromatography (HPLC) coupled with mass spectrometry. RESULTS: Our study showed that homocysteine and ET-1 were significantly higher in patients compared to healthy subjects (24.40 ± 12.5 µmol/L vs 7.44 ± 2.5 µmol/L p <0.00001) for homocysteine and (15.2 ± 5.3 nmol/L vs 7.1 ± 2.7 nmol/L, p <0.00001) for ET-1. On the other hand, homocysteine varies according to tobacco and diabetes while ET-1 depends on the sex, hypertension, smoking, obesity and dyslipidemia and a statistically negative correlation was shown between homocysteine and ET-1 in coronary patients (r = -0.66 p <0.00001. CONCLUSION: The study of the variation of these two parameters in coronary patients and metabolic exploration of the relationship between homocysteine and ET-1 according to various risk factors and the interactions between themselves facilitates the decision of therapeutic treatment.

Association between Angiotensin-Converting Enzyme Inhibitors and Troponin in Acute Coronary Syndrome / Relação entre Inibidores da Enzima de Conversão da Angiotensina e Troponina na Síndrome Coronariana Aguda

Background: Cardiovascular disease is the leading cause of mortality in the western world and its treatment should be optimized to decrease severe adverse events. Objective: To determine the effect of previous use of angiotensin-converting enzyme inhibitors on cardiac troponin I measurement in patients with acute coronary syndrome without ST-segment elevation and evaluate clinical outcomes at 180 days. Methods: Prospective, observational study, carried out in a tertiary center, in patients with acute coronary syndrome without ST-segment elevation. Clinical, electrocardiographic and laboratory variables were analyzed, with emphasis on previous use of angiotensin-converting enzyme inhibitors and cardiac troponin I. The Pearson chi-square tests (Pereira) or Fisher's exact test (Armitage) were used, as well as the non-parametric Mann-Whitney's test. Variables with significance levels of <10% were submitted to multiple logistic regression model. Results: A total of 457 patients with a mean age of 62.1 years, of whom 63.7% were males, were included. Risk factors such as hypertension (85.3%) and dyslipidemia (75.9%) were the most prevalent, with 35% of diabetics. In the evaluation of events at 180 days, there were 28 deaths (6.2%). The statistical analysis showed that the variables that interfered with troponin elevation (> 0.5 ng / mL) were high blood glucose at admission (p = 0.0034) and ST-segment depression ≥ 0.5 mm in one or more leads (p = 0.0016). The use of angiotensin-converting inhibitors prior to hospitalization was associated with troponin ≤ 0.5 ng / mL (p = 0.0482). The C-statistics for this model was 0.77. Conclusion: This study showed a correlation between prior use of angiotensin-converting enzyme inhibitors and reduction in the myocardial necrosis marker troponin I in patients admitted for acute coronary syndrome without ST-segment elevation. However, there are no data available yet to state that this ...

Fundamento: A doença cardiovascular é a maior causa de mortalidade no mundo ocidental, devendo seu tratamento ser otimizado, para a redução de eventos adversos graves. Objetivo: Determinar o efeito do uso prévio de inibidores da enzima de conversão da angiotensina na mensuração da troponina I cardíaca em pacientes com síndrome coronariana aguda sem supradesnivelamento do segmento ST (SCASST), e avaliar os desfechos clínicos em até 180 dias. Métodos: Estudo prospectivo, observacional, em um centro terciário, em pacientes com síndrome coronariana aguda sem supradesnivelamento do segmento ST (SCASST). Foram analisadas variáveis clínicas, eletrocardiográficas e laboratoriais, com ênfase no uso prévio de inibidores da enzima de conversão da angiotensina e dosagem de troponina I cardíaca. Foram usados os testes qui quadrado de Pearson ou exato de Fischer , além do teste não paramétrico de Mann-Whitney. Variáveis com níveis de significância < 10% foram submetidas a modelo de regressão logística múltipla. Resultados: Incluídos 457 pacientes, com idade média de 62,1 anos, dos quais 63,7% eram do sexo masculino. Fatores de risco como hipertensão arterial sistêmica (85,3%) e dislipidemia (75,9%) foram os mais prevalentes, com 35% de diabéticos. Na avaliação de eventos em 180 dias, observaram-se 28 óbitos (6,2%). Na análise estatística, as variáveis que interferiram no aumento de troponina (> 0,5 ng/mL) foram a glicemia de admissão elevada (p = 0,0034) e o infradesnivelamento do segmento ST ≥ 0,5 mm, em uma ou mais derivações (p = 0,0016). Relacionada com troponina ≤ 0,5 ng/mL, esteve o uso de inibidores da enzima de conversão da angiotensina prévio à internação (p = 0,0482). ...