CHICAGO - William Beaumont Hospital plans to enter the market this week with $584 million of new-money and refunding revenue bonds, the first of three issues over the next several months.

This week's sale comes after all three rating agencies downgraded the three-campus system based in Royal Oak, Mich., a suburb of Detroit. The downgrades reflect weak financial performance as well as the significant increase in debt - more than 50% - that the system will take on after the upcoming borrowings, analysts said.

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