MADISON HEIGHTS, Mich., June 20, 2011 (GLOBE NEWSWIRE) -- InfuSystem Holdings, Inc. (NYSE Amex:INFU) today announced that it will join the Russell Microcap® Index when Russell Investments reconstitutes its family of U.S. indexes on June 24, 2011, according to a preliminary list of additions posted June 17 on www.russell.com/indexes.