Physio-Control LIFEPAK 1000 - Manual (Page 61)

Shock Advisory System
LIFEPAK 1000 Defibrillator Operating Instructions B-1
©2006-2012 Physio-Control, Inc.
OVERVIEW OF THE SHOCK ADVISORY SYSTEM
The Shock Advisory System (SAS) is an ECG analysis system built into the LIFEPAK 1000
defibrillator that advises the responder if it detects a shockable or nonshockable rhythm. This
system makes it possible for individuals not trained to interpret ECG rhythms to provide
potentially-lifesaving therapy to victims of ventricular fibrillation or pulseless ventricular
tachycardia. The SAS contains the following features:
• Electrode contact determination
• Automated interpretation of the ECG
• Responder control of shock therapy
• Motion detection
Electrode Contact Determination
The patient's transthoracic impedance is measured through the defibrillation electrodes. If the
baseline impedance is higher than a maximum limit, it is determined that the electrodes are not
in sufficient contact with the patient or not properly connected to the defibrillator. ECG analysis
and shock delivery are inhibited. The responder is advised to connect electrodes any time
electrode contact is inadequate.
Automated Interpretation of the ECG
The Shock Advisory System is designed to recommend a shock if it detects the following:
• Ventricular fibrillation — with a peak-to-peak amplitude of at least 0.08 mV
• Ventricular tachycardia — defined as having a heart rate of at least 120 beats per minute, QRS
width of at least 0.16 seconds, and no apparent P waves.
The SAS is designed to recommend no shock for ECG rhythms including pulseless electrical
activity, idioventricular rhythms, bradycardia, supraventricular tachycardias, and normal sinus
rhythms.
ECG analysis is performed on consecutive 2.7 second segments of ECG. The analysis of two
out of three segments must agree before a decision (
SHOCK ADVISED or NO SHOCK ADVISED )
is made.
The LIFEPAK 1000 defibrillator SAS performance for adult and pediatric ECGs is summarized in
the LIFEPAK 1000 Shock Advisory System (SAS) Performance Report on the LIFEPAK 1000
Product CD.
Control of Shock Therapy
The Shock Advisory System causes the AED to charge automatically when it detects the
presence of a shockable rhythm. When a shockable rhythm is detected, the defibrillator
instructs the user to deliver the shock by pressing the shock button.
Motion Detection
The Shock Advisory System detects patient motion independent of ECG analysis. A motion
detector is designed into the LIFEPAK 1000 defibrillator
.
Motion Detection can be configured to
be ON or OFF .