Another jumping pacemaker
- by ajp
- 2015-03-20 12:03:08
- General Posting
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- 4 comments
Another jumping pacemaker
Comment posted by ajp on 2015-03-20 12:46.
Two years ago, my St Jude pacemaker began literally jumping in my chest. You could actually see the pacemaker hopping up and down under the skin. This began this as I was getting up from a chair and turning off the TV. I had been watching televison (led 40 inch Samsung) from a distance of about 4 feet. There were no induction coils, magnetic devices or other tools or appliances operating nearby.
The homes exterior electrical panel was located on the wall about 10 feet from whre was sitting.
I went to the ER. The pacemaker was still jumping when I arrived.
My heart rate had risen rapidly from 60 BPM to about 85 BPM. The heart beat was fluctuating at a peculiar rythm: 2 quick beats then two slow beats. The ER called the St Jude technician who arrived in about 45 minutes. She had never seen anything like (nor had the ER med personnel) Well into hour 2 of this experience, the tech finally got someone at St Jude to tell her to turn off the pacemaker and reprogram it. She did and within about fifteen minutes she had the pm operating normally. The tech and I both reported the problem to the FDA and St Jude. I filled out the report form twice on the FDA website. I received a confirmation from the FDA that they had gotten the report. Despite numerous inquiries, I did not hear from them again. Neither did the Tech. I saw her a week ago and she said nothing had ever come of the incident report and that it was only time she had ever had seen a jumping pacemaker that lost its prograrm without any kind of obvious environmental cause. The pacemaker was "undamanged" the leads to the heart stayed in place and are in good shape. The device passed its last test a month ago still in "perfect conditiion." ?????
4 Comments
Ah, another retirede engineer!
by donr - 2015-03-21 07:03:17
John, my first thought, also. I had a similar, but not exact replica of this problem when I had a lead break at the 4 yr point.
There are very few points in a house where electric fields can even begin to be strong enough to affect a PM. My experience w/ that is a 240 Volt cable feeding an electric water heater & carrying 30 Amps - less than 6 inches fro my PM. All it did was put it in "Test" Mode. No jumping, etc. I didn't even begin to suspect all the electrical associations mentioned. When the poster got up & went to the ER, that completely wiped out anything electrical external to the body.
Back to my lead separation: The PM went into Unipolar mode functioning when the lead sheath was broken, causing the body to be the return path; where the return current entered the PM case it stimulated a nerve somewhere that made the local muscles twitch - but only enough for me to sense, not cause any visual jumping.
This would be my first thought - for some reason the PM went into unipolar mode & a local nerve somewhere along the path was stimulated, causing a muscle to do more than twitch. Especially were it unipolar in the Ventricular lead, which operates at a much higher voltage than an Atrial lead.
Second possibility - When you go to turn off a TV set, you reach forward w/ an arm. If done w/ the arm on the PM side - & I had this happen once while reaching to open a fridge door - you pull a muscle & it can start to twitch uncomfortably.
The HR reported is immaterial - just getting up to walk & being anxious about something will very easily & normally jump your HR to 85. No big deal.
The peculiar rhythm is interesting. Assuming that observation was taken from watching a monitor or an ECG strip, it implies cardiac involvement, but here again, it would have to be caused by a leak of current somewhere, stimulating a nerve. Just a heart beat would not cause the PM to pulse or muscles to twitch.
Verrrrry interesting.
Donr
More on the "jumping" PM
by ajp - 2015-03-21 11:03:14
The PMâs "jumping" may have masked any electrical pulsing that might have been going on. The "jumping" was concentrated in the area of the implant pocket. The tech was the one who mentioned the weird heart rhythm. Based on the almost immediate success in reprograming the PM and her subsequent testing, the tech ruled out any lead problems. The PM has not malfunctioned since. St Jude says it is in perfect shape,with at least five years of battery life remaining.
Jumping PM.......
by Tattoo Man - 2015-03-23 01:03:58
.....I get this too...it happens about once a fortnight and as far as I can tell its all about the underlying muscle being irritated and going into a short period of small spasms...about every 10-30 seconds and lasting 5-15 minutes.
This is not a lead fracture issue ( Been checked )...my guess is that it may have something to do with my PM being sutured in to prevent bouncing when I run.
Keep us posted on any news.
Tattoo Man
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Curious!
by johng - 2015-03-20 05:03:13
Hi! AJP,
You have aroused my curiosity, do you have any idea as to the mechanism which enabled the PM to move?
Was it being moved by your muscles, or was there any electrical pulsing that you could feel?
Please keep us informed of any explanation you find.
Regards, Johng