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December 17, 2004
Thanking Paramedics for their role in groundbreaking ORBIT study of out of hospital defibrillation
Attention Health Editors/Reporters:

Toronto Emergency Medical Services and ZOLL Medical Corporation will formally
thank the many paramedics from Toronto EMS who made critical contributions to
the ORBIT (Out-of-Hospital Rectilinear Biphasic Investigational Trial) study of
the effect of different types of defibrillators in treating patients who have
cardiac arrests outside hospital.

Date: Monday, December 20
Time: 1 p.m.
Place: Toronto Emergency Services Headquarters
4330 Dufferin St.

ORBIT is the largest and most comprehensive study ever undertaken in an
out-of-hospital setting to look at the advantages of biphasic versus monophasic
waveforms in the defibrillation of cardiac arrest patients. Biphasic
defibrillators convert heart rhythms by sending a shock in two directions at
lower energy levels than conventional monophasic defibrillators.

The study was led by Laurie Morrison M.D. of Sunnybrook and Women's College
Health Sciences Centre and the University of Toronto Division of Emergency
Medicine. Toronto EMS staff randomly equipped Advanced Care Paramedics with the
two types of defibrillators, and the paramedics submitted documentation for
patients fitting the study criteria.

As a leader in pre-hospital emergency medical care, Toronto EMS strives to
advance the paramedic profession by partnering with medical investigators and
leading edge research companies to test and develop new medical equipment and

ZOLL Medical Corporation is currently the exclusive provider of defibrillators
to Toronto Emergency Medical Services and generously supplied the equipment
used by the paramedics for the study.

For more information on ORBIT, see sRelease.asp?nPressReleaseID=97.

Media Contact:
Larry Roberts, Toronto EMS Media Relations, 416-392-2255 office;
416-708-8125 cell



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