Volume 115, Nº 1, Supplement 1, July 2020
DOI: https://doi.org/10.36660/abc.20180363
CASE REPORT
Transient Prominent Anterior QRS Forces in Acute Left Main Coronary Artery Subocclusion: Transient Left Septal Fascicular Block
Andrés Ricardo Pérez-Riera
Raimundo Barbosa-Barros
Rodrigo Daminello Raimundo
Luiz Carlos de Abreu
Marcos Célio de Almeida
Kjell Nikus
Figure 3 – Outline showing the initial ventricular activation in cases of LSFB. Left His system with its three divisions, in a left sagittal projection. The LAF ends at the base of the ALPM of the mitral valve. The LPF ends in the base of the PMPM of the mitral valve. Since the activation vectors dependent on the anterosuperior (A) and posteroinferior (B) fascicles go in opposite directions, they cancel each other, with minimal predominance of LPF. This phenomenon explains the frequent initial q wave in the right precordial leads in the presence of LPFB. Note the absence of the first 1AM vector, dependent on LSF. LBB: left bundle branch; RBB: right bundle branch; LAF: left anterior fascicle; LPF: left posterior fascicle; LSF: left septal fascicle; LSFB: left septal fascicular block.
Keywords: Coronary Occlusion; Truncus Arterious; Acute Coronary Syndrome; Fibrinolytic Agents; Percutaneous Coronary Intervention; Angina, Stable; Electrocardiography/methods.
