INTERVALO QT CORRIGIDO EM PORTADORES DE INSUFICIÊNCIA CARDÍACA DE FRAÇÃO DE EJEÇÃO REDUZIDA CRÔNICA SOB TRATAMENTO PADRÃO NO BRASIL

Abstract

Even with therapeutic advances, morbidity and mortality related to Heart Failure (HF) has been rising. One of the main causes of mortality in HF is caused by malignant ventricular arrhythmias that may be related to widening of the QT interval. Objectives: to study the characteristics and prognosis of patients with reduced fraction HF with QT interval widening. Methodology: collection of data from patients with an ejection fraction below 50% from June 2021 to October 2022, derived from the ongoing Rosa dos Ventos study, with analysis of the QT interval and demographic variables, HF etiology, functional class , comorbidities, and 6 and 12 month follow-up to assess the need for hospitalization, emergency visits, death and need for heart transplant. Results: 54 patients were included, the majority of whom were male, with ischemic etiology and NYHA functional class II and III. Hypertension and dyslipidemia were the most frequent comorbidities, there was statistical significance in patients with an increased QT interval and lower ejection fraction, with a greater demand for emergency care in the 12-month follow-up. Conclusion: the present study was able to evaluate the QT interval in patients with HFREF and HFrEF in an outpatient setting, but it presented limitations probably due to the small size of patients included, with studies with a larger number of patients being necessary to better define the expected outcomes.