Guidant Profit Up on Defibrillator Sales  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 Thursday its quarterly net profit rose,  helped by sales of implantable devices to treat irregular heart  rhythms.