Study type: Medical/biological study (experimental study)

Effect of digital cellular phones on tachyarrhythmia analysis of automated external defibrillators. dev./impl.

Published in: Eur J Emerg Med 2004; 11 (2): 75-80

Aim of study (acc. to author)

Emergency services personnel, family members, or patients often carry and use digital cellular phones on sites of emergencies. As there are reported effects on implanted pacemakers and cardioverter defibrillators, the influence of mobile phones on automated external defibrillators was examined.

Background/further details

Automated external defibrillator models were bench tested for their correct decision to or not to advise a shock, while being exposed to electromagnetic interference from a mobile phone with 2 W or a portable cellular phone with 8 W transmitting power. The sensitivity and specificity of electrocardiogram analysis systems were studied, with shockable and non-shockable rhythms provided by an electrocardiogram simulator and on two human subjects with normal sinus rhythm.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 906.2 MHz
Modulation type: pulsed
  • power: 2 W unspecified (by Motorola MicroTAC 5200.)
  • power: 8 W unspecified (by Motorola International 1000.)
Exposure 2: 906.2 MHz
Modulation type: pulsed
  • power: 2 W unspecified (by Motorola MicroTAC 5200.)
  • power: 8 W unspecified (by Motorola International 1000.)

Exposure 1

Main characteristics
Frequency 906.2 MHz
Modulation
Modulation type pulsed
Repetition frequency 217 Hz
Additional info

Used in speech mode.

Exposure setup
Exposure source
Setup The mobile phones were placed in three different positions, on the AED, between patient electrodes and at 1 m distance from AED.
Additional info The testing rhythms were generated by an electrocardiogram (EEG) simulator which was contained in a grounded box made out of 2 mm sheet iron to create a Faraday cage. A 5 mm PVC sheet was mounted on top of the box with electrodes separated at 30 cm distance. Inside the cage a 50 Ohm manikin load box was connected between the simulator and the outer electrodes. The automated external defibrillators (AEDs) were connected to the stimulator with their original diaposable defibrillation electrodes.
Parameters
Measurand Value Type Method Mass Remarks
power 2 W unspecified unspecified - by Motorola MicroTAC 5200.
power 8 W unspecified unspecified - by Motorola International 1000.

Exposure 2

Main characteristics
Frequency 906.2 MHz
Modulation
Modulation type pulsed
Additional info

The testing sequence used discontinious transmitting exchange (DTX) with a burst frequency of 4 to 8 Hz in muted microphone mode.

Exposure setup
Exposure source
Parameters
Measurand Value Type Method Mass Remarks
power 2 W unspecified unspecified - by Motorola MicroTAC 5200.
power 8 W unspecified unspecified - by Motorola International 1000.

Methods Endpoint/measurement parameters/methodology

Time of investigation:
  • during exposure

Main outcome of study (acc. to author)

Shock advisory systems of automated external defibrillators are not susceptible to electromagnetic interference of 900 MHz mobile phones. Voice prompts, however, could be distorted by the operation of nearby digital cellular phones. This issue needs to be addressed during automated external defibrillator training.

Study character:

Study funded by