In-Reply-To: <[log in to unmask]>
Was it this one from Gautam?
Any Tech-heads out there?.....
Can someone explain to me why stonking ST elevation on ambulance 12-leads
is frequentlyNOT apparent on A&E 12-leads when repeated a few minutes
later? We have all, I'm sure,seen similar differences between real-time
3-lead ECG monitor ST segments and formal12-lead traces.
This clearly has serious implications for pre-hospital initiation of lysis
(don't get mestarted on that old chestnut again).
Mad Mike Bjorky (sometime member of this list) has pointed out to me that
the PhysioControl gadgets he uses in the back of his white taxi use a much
wider frequency resposerange (0.05-150 Hz) than our Hewlett Packard
gadgets in A&E (0.5-100 Hz).
I would like to know....
1) What frequency response range do YOU use in your depts / ambulances /
surgeries (therange is usually printed out on the 12-lead ECG)?
2) If the different frequency response range IS responsible for different
ST signs, whichrange SHOULD we be using?
I've asked our medical electronics boffins, who suggest the difference may
be due tointerference from myriad 50Hz power sources in A&E which are
generally NOT a problem inambulances (low voltage rectified d.c. or
batteries).
Our boffin suggested we could change the frequency response range on our
HP machines.I know we can, BUT SHOULD WE?
I've looked on the web: not much help.
Anyone got an Email address for technical support at Physio Control or
Hewlett Packard?
Dr G Ray
Staff Grade
A&E
Sussex
Reply to [log in to unmask]
Best wishes,
Rowley Cottingham
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