TY - JOUR T1 - Uncontrolled ventricular rate in atrial fibrillation. A manifestation of dissimilar atrial rhythms. JF - British Heart Journal JO - Heart SP - 106 LP - 109 DO - 10.1136/hrt.42.1.106 VL - 42 IS - 1 AU - C V Leier AU - T M Johnson AU - R P Lewis Y1 - 1979/07/01 UR - http://heart.bmj.com/content/42/1/106.abstract N2 - A patient with coarse atrial fibrillation and a rapid ventricular response developed periods of high grade atrioventricular block interpersed with periods of rapid ventricular conduction after the administration of digitalis and propranolol. Intracardiac atrial recordings showed similar atrial rhythms of high right atrial flutter and left atrial fibrillation. The low right atrial recordings showed flutter during the periods of fast ventricular rates and fibrillation during periods of slower ventricular rates. ER -