Medtronic 500 T Betriebsanleitung PDF herunterladen (Seite 84)

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AEDs

without an ANALYZE

button, analysis restarts automatically. If the motion does cease within 20 seconds, ECG analysis

proceeds automatically.

There are two reasons why ECG analysis is inhibited when motion is detected:

Such motion may cause artifact in the ECG signal. This artifact can cause a nonshockable ECG

rhythm to look like a shockable rhythm. For example, chest compressions during asystole can look

like shockable ventricular tachycardia. Artifact can also cause a shockable ECG rhythm to look like a

nonshockable rhythm. For example, chest compressions during ventricular fibrillation can look like

an organized and, therefore, nonshockable rhythm.

The motion may be caused by a rescuer’s interventions. To reduce the risk of inadvertently shocking

a rescuer, the motion alert prompts the rescuer to move away from the patient. This will stop the

motion and ECG analysis will proceed.

A-2

AED.

MOTION DETECTION

can be configured in the setup mode to be ON

or OFF.

Motion can be caused by CPR, rescuer movement, patient movement, vehicle movement, or other

causes. If variations in the transthoracic impedance signal exceed a maximum limit, it is determined

that patient motion of some kind is present. ECG analysis is inhibited until the motion ceases. The

operator is advised any time motion is detected during an analysis by a displayed message, a voice

prompt, and an audible alert. If the motion does not cease within 20 seconds, analysis attempts will stop

until the operator presses the

ANALYZE

button again. For LIFEPAK 500

AED

is turned on. CPSS is

not active during ECG analysis.

Motion detection is not active during the CPSS. Therefore, there is a chance that motion distortion in

the ECG rhythm may be interpreted by CPSS as a potentially shockable rhythm.

Motion Detection

The Shock Advisory System detects patient motion independent of ECG analysis. A motion detector is

designed into the LIFEPAK 500

AED

to charge automatically when it detects the presence of a

shockable rhythm. When a shock is advised, the operator remains in control of when the shock is

delivered.

Continuous Patient Surveillance System

The Continuous Patient Surveillance System (CPSS) automatically monitors the patient’s ECG rhythm

for a potentially shockable rhythm while the electrodes are attached and the

AED

Safety and Efficacy. Circulation, 1997, Vol. 95, 1677-1682.

VF = ventricular fibrillation

VT= ventricular tachycardia

NSR = normal sinus rhythm

Operator Control of Shock Therapy

The Shock Advisory System causes the

AHA Task Force on Automatic

External Defibrillation, Subcommittee on

3Automatic

External Defibrillators for Public Access Defibrillation: Recommendations for Specifying and Reporting Arrhyth-

mia Analysis Algorithm Performance, Incorporating New Waveforms, and Enhancing Safety.

AAMI;1993.

DF39-1993 Standard for Automatic External Defibrillators

and Remote-Control Defibrillators. Arlington, VA:

2Association

for the Advancement of Medical Instrumentation.

Mecltronic

Physio-Control ECG database. Each sample is run 10 times asynchronously.

Intermediate:

fine VF

Report only 89.7% sensitivity.

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