ECG Changes in Acute Myocardial Infarction

Posted by e-Medical PPT Sunday, July 4, 2010
Myocardial infarction (MI) or acute myocardial infarction (AMI) is caused by necrosis of myocardial tissue due to ischaemia, usually due to blockage of a coronary artery by a thrombus. Most myocardial infarctions are anterior or inferior but may affect the posterior wall of the left ventricle to cause a posterior myocardial infarction.Classical symptoms of acute myocardial infarction include sudden chest pain (typically radiating to the left arm or left side of the neck), shortness of breath, nausea, vomiting, palpitations, sweating, and anxiety.
General ECG Changes suggestive of acute MI
1. New left ventricular strain pattern
2. New Left Bundle Branch Block
3. Q Waves (.04 sec and 1/3 height of R Wave)
    Unless isolated in Lead III
4. T Wave inversion
     Unless isolated to Lead III or Lead V1
5. ST-T elevation (more than 1mm in limb or precordial leads)
6. ST depression in Lead V1, Lead V2 (Posterior MI)
7. Hyperacute T Waves (over 50% of preceding R)

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