namf
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Hi!
Can someone please remind me of what happens to ST segments with MI?
If you care to add any hi-yield info which might be useful to remember about electrocardiograms for USMLE, that would be great too/
Thanks!
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| mdwannabe
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It elevates more than 2 mm off bease line. Diffrerent leads showing elevation will say the anatomical position of occlusion. All leads elevated suggests endocarditis.
Do u need the locations of MI's? I am not quite clear on what u want to know.
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| dariush
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from Cardiology i can tell you there are two types of MIs:
1) "ST elev. MI" which is the typical case that indicates Hypoxia of the myocardium but NOT Necrosis yet, from here till signs of Necrosis show up (Deep Q,later ST depression,negative T), there is a time window during which the blockade should be openned. in other words before the appearance of Necrotic Q,etc.
2) "NON-ST elev. MI" is the second type that shows clinical signs of MI (angina> 20min.) but NO ST changes. according to Harrisons it is a result of an incomplete block.
for your info these two + Unstable Angina together are called
"Acute Coronary Syndrome"
now from the point of locating the MI you will see various ideas but this one is a logical one:
Ant. : I,avL,V1-V6 (if all chest leads are involved they refer to that as Extensive ant.)
Infer. : II,III,avF
lat.: V5-6
Post.: V1-2 (but a MIRROR image of typical T en dome/Rabbit figure)
hope that helped.
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| dariush
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mdwannabe, are you sure about Endocarditis `cause i remember vaguely that if all leads or non-related leads show ST elev. that is a PERICARDITIS ??!! give me a clue
please.
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| mani
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i too think it should be pericarditis
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| namf
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Dariush,
Thank you very kindly for your detailed reply  :icon_thumb:
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| mdwannabe
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my mistake... sorry...atypo. it is PC not EC. I appologize.
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