Anyone ever seen a LP12 do this before?

[JPINFV]

If I was still doing undergrad research, I'd try to find a picture of an EEG that has a 60 cycling artifact. Depending on how sensitive the equipment is, eliminating 60 cycling could be near impossible. There were days where we had to reschedule because there was nothing we could do to eliminate it.

[HERBIE1]

If I was still doing undergrad research, I'd try to find a picture of an EEG that has a 60 cycling artifact. Depending on how sensitive the equipment is, eliminating 60 cycling could be near impossible. There were days where we had to reschedule because there was nothing we could do to eliminate it.

Any paramedic text or basic cardiology book should have examples of 60 cycle interference. Once you see it, you can easily pick it up the next time- it's pretty classic. The problem with the posted strip is that the printer may be slow, the stylus needs adjustment, or the paper was sticking, but if you look close, you can see the classic pattern. The only issue I have is that baseline is also wandering a bit, so that's why I also said it may be a lead problem.

[WANTYNU]

Can't load the picture, but with a bunch of other experienced folks recognizing it as 60 cycle, it most likely is.

But there is another reason I've seen.

Was the monitor left out in the sun or in a hot bus? Remember it's a thermal printer, if it got hot, it could print thicker lines.

Just another R/O

-w

Edited September 30, 2009 by WANTYNU

[HERBIE1]

Can't load the picture, but with a bunch of other experienced folks recognizing it as 60 cycle, it most likely is.

But there is another reason I've seen.

Was the monitor left out in the sun or in a hot bus? Remember it's a thermal printer, if it got hot, it could print thicker lines.

Just another R/O

-w

Good point. Those printers can get pretty hot if you've printed enough paper, so I suppose those thick lines could result from that.

[JPINFV]

Any paramedic text or basic cardiology book should have examples of 60 cycle interference. Once you see it, you can easily pick it up the next time- it's pretty classic. The problem with the posted strip is that the printer may be slow, the stylus needs adjustment, or the paper was sticking, but if you look close, you can see the classic pattern. The only issue I have is that baseline is also wandering a bit, so that's why I also said it may be a lead problem.

...but there's a difference in terms of scale between what you'll see on an EEG (where a display may be 600 milliseconds) vs an ECG (which would display it over several seconds). I'm not saying that paramedics aren't taught about it, but it's the difference between seeing a spleen in an anatomy course and seeing a spleen in a histology course.

[fiznat]

Again in case anyone can't see the strip, here is a direct link:

http://www.fiznat.com/photos/ECG/thickasystole.jpg

[EMT City Administrator]

You can always attach the file.