RT Journal T1 THe irregular tachycardia that was not atrial fibrillation—discussion JF Archives of Internal Medicine JO Archives of Internal Medicine YR 2011 FD December 12 VO 171 IS 22 SP 1986 OP 1988 DO 10.1001/archinternmed.2011.578 UL http://dx.doi.org/10.1001/archinternmed.2011.578 AB