title: [Concealed but not invisible].
abstract: A 79-year-old woman was admitted to our institution for 2:1 atrioventricular (AV) block. During observation in the intensive care unit, the characteristics of the block changed from stable 2:1 to Mobitz 2 second degree AV block or to transient first degree AV block. In addition, frequent AV junctional extrasystoles were observed. The analysis of several tracings suggested that no true AV block was present, but concealed AV junctional extrasystoles, often in bigeminal rhythm, resulted in pseudo AV block.
authors.affiliation: U.O. di Cardiologia, ARNAS Garibaldi Centro, Catania. diguardo@alice.it
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Di Guardo
mesh_terms: D000368:Aged; D054537:Atrioventricular Block / Q000175:diagnosis* / Q000503:physiopathology; D004562:Electrocardiography; D005260:Female; D006801:Humans