ECG filters

[MTGas2B]

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Had an interesting case today. Patient rolls back into the room. Five lead goes on, shows flipped T waves. Pre-op 12 lead ECG had been normal. I get called in to take a look, for another set of eyes. Before I can comment case canceled. They grab another 12 lead when the patient is back out in holding, unchanged from pre-op, no flipped T waves.

I go back, hook myself up to the monitor (I have no know cardiac disease), change the filters, and voila! I can flip my own T waves.

[YOUTUBE]MkirL1SO5xc[/YOUTUBE]

I had known that putting a higher frequency filter on could change ST segments, but I hadn't seen it flip T waves before. The filters try to keep the baselines clean so you can diagnose arrhythmias, "Is that V-tach or a wandering baseline?". If you want to look at morphologies or segments you should turn the filters down or off.

 

[Bertelman]

That was quite informative. Thanks!

 

[rsgillmd]

I didn't realize you could turn the filters up/down. I always thought it was just on/off. I'll have to play with this. Thanks.

......I had known that putting a higher frequency filter on could change ST segments, but I hadn't seen it flip T waves before. The filters try to keep the baselines clean so you can diagnose arrhythmias, "Is that V-tach or a wandering baseline?". If you want to look at morphologies or segments you should turn the filters down or off.

 

[MTGas2B]

I didn't realize you could turn the filters up/down. I always thought it was just on/off. I'll have to play with this. Thanks.

Depends on the monitor. We have GE's. They have a diagnostic mode (no filter) and three filter settings.

 

[epidural man]

Had an interesting case today. Patient rolls back into the room. Five lead goes on, shows flipped T waves. Pre-op 12 lead ECG had been normal. I get called in to take a look, for another set of eyes. Before I can comment case canceled. They grab another 12 lead when the patient is back out in holding, unchanged from pre-op, no flipped T waves.

I go back, hook myself up to the monitor (I have no know cardiac disease), change the filters, and voila! I can flip my own T waves.

[YOUTUBE]MkirL1SO5xc[/YOUTUBE]

I had known that putting a higher frequency filter on could change ST segments, but I hadn't seen it flip T waves before. The filters try to keep the baselines clean so you can diagnose arrhythmias, "Is that V-tach or a wandering baseline?". If you want to look at morphologies or segments you should turn the filters down or off.

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