Indiana-based Guidant Corporation is planning to double the size of its operations in the Twin Cities over the next 20 years. The medical technology company's Cardiac Rhythm Management, or C-R-M group is based in Arden Hills. It employs almost 25-hundred people. Guidant's plans are the topic of an article in today's edition of the journal City Business. Sam Black is the reporter who wrote the piece. He says the Guidant campus COULD grow into one of the biggest in the Twin Cities.