Other ECG changes that may be observed during myocardial ischemia
  ECG changes during myocardial ischemia are not limited to ST segment or T wave.
Other ECG changes which may be observed during myocardial ischemia
  Atrioventricular (AV) block
  Arrhythmias
  Prolongation of the QT interval
  Negative U waves
  Bundle branch block
  QRS alternance
ECG 1. The ECG above belongs to a patient with unstable angina pectoris.
Negative T waves
are observed in leads C2-C5
while
negative U waves
are seen in leads C2-C4. Additionally, the PR interval is above 200 msec (1st degree AV block).
Coronary angiography showed significant stenosis of the LAD and Circumflex (Cx) arteries.
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ECG 2a. Atrial fibrillation developing during acute anterior wall myocardial infarction.
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ECG 2b. Ten minutes later, the ECG of the same patient shows junctional (nodal) rhythm (QRS complexes without preceding P
waves).
Coronary angiography showed total occlusion of the LAD and significant (80%) stenosis of the intermedier
artery; the
RCA and Cx arteries were normal.
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ECG 3. the ECG above is from a 45 years-old man awaiting coronary artery bypass graft surgery after acute anteriyor myocardial
infarction. QT interval prolongation is seen.
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