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Electro-vectorcardiographic demonstration of rate-independent transient left posterior fascicular block
Andrés Ricardo Pérez-Riera1, Raimundo Barbosa-Barros2, Maria Tereza Sá Leitão Ramos Borges2
1Laboratorio de Pesquisa e Escrita Científica da Faculdade de Medicina do ABC, Santo André, SP, Brazil.
Abstract:
Left posterior fascicular block (LPFB) is a rare intraventricular conduction disorder of rare occurrence, especially as an isolated entity. Its transient form is even rarer and maybe rate-independent or rate-dependent intermittent LPFB (phase 3 block, tachycardia-dependent and phase 4 block or bradycardia-dependent). We present a case of a young adult male whose baseline ECG/VCG showed the typical LPFB pattern. A treadmill stress test revealed rate-independent intermittent LPFB with random occurrence. Imaging exams ruled out structural heart disease. To our knowledge, this is the first case in the literature of a rate-independent intermittent LPFB with no underlying structural heart disease.
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