RT Journal T1 WIde qrs tachycardia in a young patient—discussion JF Archives of Internal Medicine JO Archives of Internal Medicine YR 2012 FD April 9 VO 172 IS 7 SP 538 OP 539 DO 10.1001/archinternmed.2012.19b UL http://dx.doi.org/10.1001/archinternmed.2012.19b AB