Resumen

DE LA TORRE FONSECA, Luis M. et al. Masquerading bundle branch block. CorSalud [online]. 2020, vol.12, n.3, pp. 343-347.  Epub 01-Sep-2020. ISSN 2078-7170.

Masquerading bundle branch block is a rare form of bifascicular block, whose exact mechanism is unknown. It is more frequently found in elderly patients or those with structural heart disease such as: coronary artery disease, ventricular hypertrophy, cardiomyopathies, Chagas myocarditis and idiopathic degeneration of the cardiac conduction system. Its electrocardiographic diagnosis is obtained by the presence of high and wide R waves in V1 (right bundle branch block pattern), left axis deviation (between -80 and -120 degrees) and an S wave of less than 1 mm or absent in I and aVL leads. Its presence denotes a poor prognostic factor in patients.

Palabras clave : Bundle branch block; Left anterior hemiblock; Masquerading bundle branch block; Diagnosis.

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