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Life Saving Therapy Inhibition by Phones Containing Magnets

heartrhythmjournal.com

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Re: Life Saving Therapy Inhibition by Phones Containing Magnets

#5
At the moment Apple support site states that:

> Though all iPhone 12 models contain more magnets than prior iPhone models, they’re not expected to pose a greater risk of magnetic interference to medical devices than prior iPhone models.

https://support.apple.com/guide/iphone/important-safety-info...

It would be interesting to verify this, i.e. compare the risk of interference for iPhone 11 and iPhone 12.

Re: Life Saving Therapy Inhibition by Phones Containing Magnets

#6
> Once the iPhone was brought close to the ICD over the left chest area, immediate suspension of ICD therapies was noted which persisted for the duration of the test.

Yeah so if you have a pace maker, try not to put magnets near your heart. The main practical impact for smart phone users with pacemakers seems to be that you shouldn’t carry a phone with a magnet mount in your breast pocket.

The article also mentions WHY pacemakers are so sensitive to otherwise benign levels of magnetism:

> All ICD’s have an in-built switch (Reed switch, Hall-effect sensors, Giant magneto sensitive resistors or coils) which respond to an externally applied magnetic field.

It’s not clear from the article what function these magnetic sensors provide. I suspect it’s either a way for the internal device to interface with an external control circuit or just a minimally invasive off switch.

Re: Life Saving Therapy Inhibition by Phones Containing Magnets

#7
post #2

It's worth noting that almost anything with a magnetic field can interfere with a pacemaker, for instance induction hobs. Given the pervasiveness of, well, magnets (!), it's probably worth investing in pacemaker research which takes this into account ...

People don't tend to hug their hobs though...

Re: Life Saving Therapy Inhibition by Phones Containing Magnets

#8

Editorialized title. The actual is: Life Saving Therapy Inhibition by Phones Containing Magnets The article is about the iPhone 12. Just pointing out that magnets aren’t specific to the iPhone.

The editorialised title is both accurate to the beginning of the article, and more informative. I would have ignored the original title. Thanks to the editorialised title, I now know that magnets can mess with pacemakers.

Re: Life Saving Therapy Inhibition by Phones Containing Magnets

#9
post #6

> Once the iPhone was brought close to the ICD over the left chest area, immediate suspension of ICD therapies was noted which persisted for the duration of the test. Yeah so if you have a pace maker, try not to put magnets near your heart. The main practical impact for smart phone users with pacemakers seems to be that you shouldn’t carry a phone with a magnet mount in your breast pocket. The article also mentions W…

They turn off/disable the pacemaker. They are used in situations where the pacemaker is not functioning as intended. ERs have ring magnets specifically to activate this designed feature. Imagine if a pacemaker is triggering the heart out of sequence, or if an installed defibulator is constantly shocking the heart. The external magnet is a simple way of turning it off temporarily.

Re: Life Saving Therapy Inhibition by Phones Containing Magnets

#10
post #7
post #2

It's worth noting that almost anything with a magnetic field can interfere with a pacemaker, for instance induction hobs. Given the pervasiveness of, well, magnets (!), it's probably worth investing in pacemaker research which takes this into account ...

People don't tend to hug their hobs though...

Hobs output >2 kW, phones just... don’t (edit: i.e range of magnetic field is longer)
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