title: [Left bifascicular block and percutaneous mitral valvuloplasty].
abstract: In some patients, the inflation of balloons through the mitral orifice during percutaneous mitral valvuloplasties may impair intraventricular conduction. In some cases, this appears to correspond to a block of the anterior and middle network within the left branch of the bundle of His. This left "biblock" is characterized by extreme left axial deviation of AQRS, of about -60 to -70 degrees, with a QS aspect on D2 and D3, RS on V1 and R on V6 with no major prolongation of ventricular activation time. If this hypothesis is correct, it would support the "trifascicular" concept of the left branch of the bundle of His.
authors.affiliation: Service de Cardiologie, Hôpital Boucicaut, Paris.
authors.forename: F
authors.initials: F
authors.lastname: Fernandez
authors.forename: R
authors.initials: R
authors.lastname: Soria
authors.forename: P
authors.initials: P
authors.lastname: Rocha
mesh_terms: D000328:Adult; D002037:Bundle-Branch Block / Q000209:etiology* / Q000503:physiopathology; D002404:Catheterization / Q000009:adverse effects*; D004562:Electrocardiography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D008946:Mitral Valve Stenosis / Q000628:therapy*
vernacular_title: Bloc "bifasciculaire" gauche et valvuloplastie mitrale percutanée.