CardioNet, which provides real-time outpatient management solutions for monitoring an individual's cardiac health, revised the terms for its IPO in a filing with the SEC on Tuesday. The company had originally planned for an offering of 6.6 million shares, including 3.6 million from selling stockholders. According to today's filing, the company will offer the same 3 million shares, but a selling stockholder will now only offer 400,000. In addition, CardioNet expects the shares to price between $18 and $20 instead of the $22-$24 range listed in previous filings. Citi is the lead underwriter on the deal, which is expected to price tonight after market close.