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What could cause ST elevation in Lead 2 (Lead II) on a 4 lead ECG but none in a 12 Lead ECG?
I'm a Paramedic and was monitoring a patients heart with a standard 4 lead monitor, Lead 2 showed about 4-5mm ST elevation and a deep R wave but when I connected 12 Lead cables to confirm Lead 2 was completely normal. After taking the 12 lead off the 4 Lead monitor still showed ST elevation. I'd given no medications other than oxygen. The cardiologist at the hospital was unsure how this happened any ideas?
None of the leads were moved during the procedures and the 12 lead uses the same limb leads as the 4 lead monitor.
If you're using the same electrodes, then there is clearly a problem with one of the machines or their wires. Try switching the wires around if that is possible. If not, or if there is no change, try hooking yourself up to the monitor and EKG. I suspect you will end up seeing the ST elevation on yourself also (i.e., it's an instrument artifact).
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December 13th, 2005 in
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