PT - JOURNAL ARTICLE AU - C V Leier AU - T M Johnson AU - R P Lewis TI - Uncontrolled ventricular rate in atrial fibrillation. A manifestation of dissimilar atrial rhythms. AID - 10.1136/hrt.42.1.106 DP - 1979 Jul 01 TA - British Heart Journal PG - 106--109 VI - 42 IP - 1 4099 - http://heart.bmj.com/content/42/1/106.short 4100 - http://heart.bmj.com/content/42/1/106.full SO - Heart1979 Jul 01; 42 AB - 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.