Long term analysis of morbidity and mortality predictors in a cohot of patients with Acute Coronary Syndrome / Análise em longo prazo de preditores de morbidade e mortalidade em coorte de pacientes com Síndrome Coronariana Aguda

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

Background: Heart failure (HF) is extremely important as a morbidity and mortality predictor in patients with acute coronary syndrome. Objective: To assess the occurrence of heart failure and other morbidity and mortality predictors in acute coronary syndrome over the long term. Methods: A cohort of 403 prospective consecutive patients was studied, complaining of chest pain. The demographic data were described, together with the clinical and laboratory characteristics. Invasive versus non-invasive risk stratification was compared, as well as differences between surgical and percutaneous intervention and drug treatment, assessing progression during hospitalisation and for periods of up to eight years after discharge, in terms of cardiovascular and non-cardiovascular events and deaths. The numerical data will be presented as means and standard deviations or as medians and interquartíle distances, with the categorical data shown as percentages. The Students t, Mann-Whitney, chi-square and Fishers exact tests were used as indicated. The Kaplan-Meier and log-rank tests were used to construct the survival model; the multivariate model was adjusted through the Cox model. After conducting the Cox survival analysis in order to underpin the proportional risk assumption, the stratified Cox model was used. All the analyses were conducted through the R Programme, version 2.9.1. Results: In the sample population of 403 patients complaining of chest pain, 65.8% were diagnosed with non-ST elevation ACS, 27.8% with ST elevation ACS, and 6.5% without ACS. In the sample population, 377 patients were assessed, with 37.93% of them women and an average age of 62.211.6 years. Creatinine was particularly noteworthy as a prognostic factor, with a cut-off point of 1.4mg/dL and accuracy of 62.1%. Statistically significant differences were also observed for age with HF and the treatments used before and after 2002 in terms of mortality. An additional variable was included in the multivariate model called the HR>SBP, for any heart rate higher than systolic blood pressure on admission. Conclusion: The presence of HF on admission, with initial creatinine of >1.4mg/dL, age and HR of patients hospitalized with ACS are independent mortality predictors. It was noted that patients with HF treated prior to 2002 presented shorter survival times than HF patients treated after 2002, due to alterations in treatment. Even with the difference in survival times related to the period of hospitalization, the impact of the clinical variables remains significant regardless of the time of hospitalization. Other studies must be conducted in order to assess whether different types of conduct for patients with HF on admission for hospitalization with ACS might lower this mortality rate.

ASSUNTO(S)

cardiologia acute coronary syndrome preditores síndrome coronariana aguda morbidade e mortalidade morbidity and mortality predictor

ACESSO AO ARTIGO

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