Aspect Medical to Report Fourth Quarter 2004 Results February 9, 2005 Conference Call Scheduled for Same Day

Business Wire, Jan 11, 2005

NEWTON, Mass. -- Aspect Medical Systems, Inc. (Nasdaq: ASPM) will report earnings results for the 2004 fourth quarter on Wednesday, February 9, 2005. Following the earnings announcement on Wednesday morning, the Company will host a conference call and live webcast at 10:00 a.m. Eastern Standard Time for all interested parties, including financial analysts, portfolio managers, individual investors and members of the press. To participate in the, call please dial 1-888-202-2422 (domestic), 1-913-981-5592 (international), or access the webcast at http://www.aspectmedical.com on the Investor page, at or http://ccbn.com. Telephone replays will be available by dialing 1-888-203-1112 (domestic), or 1-719-457-0820 (international), access code 2294092. The webcast replay will be available from February 9, 2005 until February 16, 2005.

About Aspect Medical Systems, Inc.

Aspect Medical Systems, Inc. (NASDAQ: ASPM) is a global market leader in brain monitoring technology. Aspect's BIS technology directly measures the effects of anesthetics and sedatives on the brain. The technology has been used to assess nearly 10 million patients and has been the subject of approximately 1,700 published articles and abstracts. BIS technology is installed in approximately one third of all domestic operating rooms and is available in more than 160 countries. Aspect Medical Systems has OEM agreements with seven leading manufacturers of patient monitoring systems.

For more information, visit Aspect's Web site at http://www.aspectmedical.com.