title: [Torsades de Pointes: a cause of syncope in sinus node dysfunction].
abstract: Torsade de Pointes (TdP) is an atypical ventricular tachycardia that occurs in the setting of QT interval prolongation which may be an inherited or acquired abnormality. TdP is a recognized complication of bradyarrhythmias, specifically atrioventricular block. However, sinus node dysfunction is a rare cause of syncope associated with TdP. Experimental studies have suggested that the acquired long QTU interval and TdP may be due to bradycardia or pause-dependent early after depolarizations that give rise to triggered activity. This report describes a patient with sinus bradycardia and intermittent AV nodal rhythm induced long QT interval and repetitive syncope related to TdP and successfully treated with temporal and long-term pacing.
authors.affiliation: Unidad de Cuidados Intensivos Cardiológicos, Hospital Central Norte de Concentración Nacional PEMEX, Azcapotzalco, México, D.F.
authors.forename: E
authors.initials: E
authors.lastname: Velázquez Rodríguez
authors.forename: J
authors.initials: J
authors.lastname: Rangel Rojo
authors.forename: A
authors.initials: A
authors.lastname: Ortega Sánchez
authors.forename: A
authors.initials: A
authors.lastname: Zamudio Villafuerte
authors.forename: S
authors.initials: S
authors.lastname: González Gallardo
mesh_terms: D000368:Aged; D001146:Arrhythmia, Sinus / Q000150:complications / Q000503:physiopathology; D004562:Electrocardiography; D005260:Female; D006801:Humans; D012849:Sinoatrial Node / Q000503:physiopathology*; D013575:Syncope / Q000209:etiology*; D016171:Torsades de Pointes / Q000150:complications* / Q000503:physiopathology
vernacular_title: Torsade de pointes: una causa de síncope en disfunción del nodo sinusal.