FDA OKs Some Heart Failure Therapies  CHICAGO (Reuters) - Cardiovascular device maker Guidant  Corp. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=GDT.N target=/stocks/quickinfo/fullquote"&gt;GDT.N&lt;/A&gt; said on Wednesday U.S. regulators cleared the use  of its implantable heart failure therapies for a wider group of  patients.