January 22, 2004

FOR: ZOLL Medical Corporation

INVESTOR CONTACT: A. Ernest Whiton
Chief Financial Officer
ZOLL Medical Corporation
(978) 421-9655
PRESS CONTACT: Robert Minicucci
Corporate Communications Manager
ZOLL Medical Corporation
+1 (978) 421-9832
rminicucci@zoll.com



FOR IMMEDIATE RELEASE

LAY RESCUERS PERFORM BETTER WITH ZOLL AED PLUS

Thursday, January 22, 2004 – CHELMSFORD, MASS.—ZOLL Medical Corporation (NASDAQ: ZOLL), a manufacturer of non-invasive cardiac resuscitation devices, announced study results that showed lay rescuers followed more steps in the Chain of Survival using the ZOLL® AED Plus™ than other commercially available automated external defibrillators (AEDs). The results were given during an oral presentation at the 2004 National Association of EMS Physicians (NAEMSP) Conference in early January.

In addition, the ZOLL AED Plus helped study participants significantly improve chest compressions during cardiopulmonary resuscitation (CPR), with an average 250% increase in the depth of compression. There was no improvement in compressions with any other device used in the study.

The study examined eight elements in the Chain of Survival: Check response, seek help, open airway, check breathing, give breaths, check circulation, remove clothing, and attach AED electrodes. These elements are part of guidelines from the American Heart Association (AHA) and other International Liaison Committee on Resuscitation (ILCOR) member organizations, which suggest that the highest survival rates from cardiac arrest are attained when all elements of the Chain of Survival are performed.

“Remembering all the elements in the proper order can be difficult for lay rescuers who, of course, are not used to dealing with cardiac arrest,” said Steven G. Miller, M.D., the principal investigator and a member of the faculty at Harvard Medical School. “Study participants who used the ZOLL AED Plus, which is designed to support all of the steps in the Chain of Survival, did significantly better than those who used other AEDs. The study suggests AEDs that provide support-prompts to assist with carrying out the steps of the Chain may help to achieve higher survival rates for out-of-hospital cardiac arrest.”

“These results confirm the impact the ZOLL AED Plus has on resuscitation efforts,” said Richard A. Packer, President and Chief Executive Officer of ZOLL. “The ZOLL AED Plus is the only AED that lets rescuers see and hear how well they are performing the rate and depth of chest compressions during CPR. This real-time feedback mechanism is what differentiates the ZOLL AED Plus from other AEDs on the market today and is especially important considering that half of all victims will need well-performed CPR to have a chance to survive. This study shows that it is insufficient to simply focus on ‘the shock’ when selecting an AED if you are interested in aiding all victims of SCA.”

Study Methodology
The study consisted of 45 randomly-assigned participants. They were presented with a scenario designed to resemble what lay rescuers would encounter in a real-life situation. The ZOLL AED Plus was one of four fully-functional defibrillators used. The time since their last CPR training was an average of three years. To eliminate bias due to previous AED training, none of the subjects had prior experience or training with an AED.

Study participants were led into an office setting and told that a person, simulated by a mannequin, had just fallen to the floor, appeared to be unconscious, and could be dying. They were told to use the AED and any other object in the office, and to act as if it were a real emergency. Each person was evaluated based on eight critical actions taken from the Chain of Survival: Check response, seek help, open airway, check breathing, give breaths, check circulation, remove clothing, and attach AED electrodes. Continuous compression depth measurements also were taken during the scenario. The study was directed by Dr. Steven Miller of Harvard Medical School.

About ZOLL
ZOLL Medical Corporation (NASDAQ: ZOLL), with worldwide headquarters in Chelmsford, Massachusetts, designs, manufactures, and markets resuscitation solutions. Pacing and defibrillation devices, including ZOLL’s M Series™ and AED Plus™, and LIFECOR, Inc.’s LifeVest™ Wearable Defibrillator; and circulatory assist devices such as Advanced Circulatory Systems, Inc.’s ResQPOD™ Circulatory Enhancer and Revivant Corporation’s AutoPulse™; are used by health care professionals, emergency medical service providers, and first responders to diagnose and treat cardiac arrest wherever it may occur. ZOLL also designs and markets software that automates the collection and management of both clinical and non-clinical data. ZOLL has operations in the United States, Canada, the United Kingdom, Germany, France, the Netherlands, and Australia, and business partners in all of the world’s major markets. For more information about ZOLL, its products and partners, visit www.zoll.com or call 978-421-9655.

Certain statements contained in this press release, including statements regarding the effect of the AED Plus on resuscitation efforts, our ability to successfully market our AED’s and other statements contained herein regarding matters that are not historical facts, are “forward-looking” statements (as defined in the Private Securities Litigation Reform Act of 1995). Because such statements are subject to risks and uncertainties, actual results may differ materially from those expressed or implied by such forward-looking statements. Factors that could cause actual results to differ materially from those expressed or implied by such forward-looking statements include, but are not limited to, those factors discussed in the section entitled “Risk Factors” in the Company’s Annual Report on Form 10-K filed with the SEC on December 19, 2003.
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Copyright © 2004 ZOLL Medical Corporation. All rights reserved. 269 Mill Road, Chelmsford, MA 01824-4105. AED Plus and M Series are trademarks of ZOLL Medical Corporation. The LifeVest System is a trademark of LIFECOR, Inc. The ResQPOD is a trademark of Advanced Circulatory Systems, Inc. The AutoPulse Resuscitation System is a trademark of Revivant Corporation. ZOLL is a registered trademark of ZOLL Medical Corporation. All trademarks are property of their respective owners.