TY - JOUR T1 - Double fire tachycardia JF - Heart JO - Heart SP - 958 LP - 958 DO - 10.1136/heartjnl-2012-301800 VL - 98 IS - 12 AU - Haran Burri AU - Jacques Hoffmann AU - Marc Zimmermann Y1 - 2012/06/15 UR - http://heart.bmj.com/content/98/12/958.abstract N2 - A 69-year-old lady without any relevant medical history presented with recurrent palpitations. A 12-lead ECG was recorded and is shown in figure 1. The differential diagnosis of the narrow-complex tachycardia with a P:R ratio of 1:2 was (1) atrial … ER -