Taquicardia pré-excitada em paciente com estenose mitral / Pre-Excited Tachycardia in a Patient with Mitral Stenosis

RESUMO

Paciente masculino, 52 anos, com estenose mitral moderada, apresentou taquicardia sustentada com QRS alargado, 120bpm, com diagnóstico de taquicardia ventricular (TV) pelo algoritmo de Brugada.Eletrocardiograma (ECG) subsequente revelou flutter atrial atípico com condução atrioventricular (AV)variável, com diferentes graus de pré-excitação por via acessória lateral esquerda. Em ritmo sinusal foi possível evidenciar a pré-excitação ventricular, o que permitiu fazer o diagnóstico de arritmia atrial associada à presença de via acessória. Nesses casos, o algoritmo de Brugada sugere, erroneamente, tratar-se de taquicardia ventricular.

ABSTRACT

A 52-year-old male patient with moderate mitral stenosis developed a sustained wide QRS tachycardia of 120 bpm,diagnosed as ventricular tachycardia through the Brugada algorithm. A subsequent ECG revealed anatypical flutter with variable atrioventricular conductionat different pre-excitation levels through the left lateral accessory pathway. In sinus rhythm, it was possible tonote ventricular pre-excitation, which led to a diagnosisof atrial arrhythmia associated with the presence of anaccessory pathway. In cases of pre-excited tachycardia,the Brugada algorithm can be misdiagnosed.