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Joined: Jan 2021
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rudied Offline OP
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Joined: Jan 2021
Posts: 3
Hi all.

I am trying to establish the performance of an ECG machine and am noticing that when I set my Patient Simulator to normal sinus rhythm, 60bpm, 1mV (and later 2mV), the printout does not look right. For 1mV, the graph does not reach 1mV (measured from the base line to the top of the R wave). It sits at around 0.8mV. I then input a 2mV signal, and measure 1.7mV. If I had to go on this, I would have to fail the ECG, as it is not within the allowed 5% tolerance. I have done this with both the uni-sims that I own, and get the same results.
I am suspecting
a) I am doing something wrong, or
b) the Uni-Sims are faulty

When I use my ECG simulator on my defib tester, I get spot on 1mV and 2mV

Furthermore, when I generate a square wave of 2Hz, the amplitude is spot on too (Uni-Sim)

My questions are:

a) Can someone please comment on my findings,
b) The leading 1mV cal pulse that the ECG prints, should its baseline be on the same level as the simulated QRS waveform's baseline?

Thanks!

Joined: Dec 2015
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Savant
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Savant
Joined: Dec 2015
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Probably to ECG machine settings. Print out its config to check the current settings and then make adjustments if required. Often seen this on touch screen machines, try seeing if you can lock them the settings down under password. See if a sister device passes and then mirror its settings to the faulty model.


30 years since the Chernobyl disaster and yet we still have no super heroes or zombies.
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Super Hero
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Super Hero
Joined: Feb 2004
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Sounds like filtering ... 50/60 Hz maybe. Is it set to 50 Hz?


If you don't inspect ... don't expect.

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