Vanguard Health Systems, Inc. (NYSE: VHS) (the “Company”) plans to announce results for its fourth fiscal quarter and year ended June 30, 2012 after the market closes on Wednesday, August 22, 2012. The Company will host a conference call on August 23, 2012 at 11:00 a.m. Eastern time for senior management to discuss the Company’s financial and operating results. A live broadcast of this conference call can be found on the Investor Relations section of the Company’s website at www.vanguardhealth.com or www.earnings.com. To listen to the live call, please go to the website at least 15 minutes prior to the call to register, download, and install any necessary audio software. The online replay will follow shortly after the conclusion of the call and be available for 90 days. The Company owns and operates 28 acute care and specialty hospitals and complementary facilities and services in metropolitan Chicago, Illinois; metropolitan Phoenix, Arizona; metropolitan Detroit, Michigan; San Antonio, Texas; Harlingen and Brownsville, Texas; and Worcester and metropolitan Boston, Massachusetts. The Company’s strategy is to develop locally branded, comprehensive healthcare delivery networks in urban markets.