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"Although the devices worked normally again once the magnet was removed, the authors warned permanent damage might occur with prolonged exposure - if someone were to wear a magnetic name badge, for example."
Registered Member #103
Joined: Thu Feb 09 2006, 08:16PM
Location: Derby, UK
Posts: 845
wrote ... Swiss researchers at the University Hospital of Zurich tested the effect of neodymium magnets in 70 heart patients - 41 with pacemakers and 29 with implantable cardioverter defibrillators.
What I don't get is why they didn't just simply test the magnets on the individual devices, instead of the actual patients with the devices in them
I don't think I would want to have taken part in that test.
Registered Member #32
Joined: Sat Feb 04 2006, 08:58AM
Location: Australia
Posts: 549
I've never seen a NIB in a fridge magnet before. Then again, I can't say I've bought one recently.
The common, flexible fridge magnets cannot affect anything unless practically touching them. They have alternating strips of different polarities, which you can feel if you take two and rub them together. This means that the field lines from one strip are almost immediately drawn into the next strip and there is no significant field beyond a centimetre or so.
The rise in popularity of NIBs in everyday things could be a concern.
Registered Member #163
Joined: Mon Feb 13 2006, 01:55PM
Location: caledonia ohio
Posts: 22
pacemakers are funny animals my grandparents both have them. my grandmother has almost no restrictions and has a magnet to check the battery. once a quarter she passes a circular magnet over her pacemaker and it beeps a certin patern to give battery level. my grand father cannot stand over a running car engine or near an open circuit breaker panel because it can cause the built in defibulator to fire. i would guess it depends on the type of pacemaker and manufacturer.
Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
Pacemakers/defibrillators have evolved over the years with regard to their capabilities. Pacemakers in the simplest sense will detect native electrical heart activity. If there is a native "beat" then it will not fire; if there is none it will send its own signal to cause the heart to beat. Magnets used to convert this "sensing" mode to a straight firing mode. It will fire no matter what the heart is doing. Usually, this mode is used the heart has no rhythm on its own or one is having surgery where electrical devices are used and could stop the device from working.
Defibrillators are much more complex, but essentially they will charge and fire if they detect electrical activity consistent with fibrillation or certain tachycardias. These rhythms do not generate blood flow and lead to death. They are programmed and tested specifically for each patient after they are implanted. The patient is rendered unconscious, deliberately put into a fatal rhythm and then converted out of it with the successful firing of the device. Depending on the manufacturer, magnets can turn this mode off or wipe out any programming done to the device for the patient.
I would be more concerned with one of these people walking around an operating Tesla Coil or other RF device as these might cause the device to fire. A standard magnet shouldn't cause any harm. Anyone playing with a Neo magnet should be careful.
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Fridge Magnets 'can be a killer'
