* Illustration of<unk>  elevation and depression The normal<unk>  has a slight upward concavity. * Flat, downsloping, or depressed<unk> s may indicate coronary ischemia. *<unk>  elevation may indicate transmural myocardial infarction. An elevation of >1mm and longer than 80 milliseconds following the J-point. This measure has a false positive rate of 15-20% (which is slightly higher in women than men) and a false negative rate of 20–30%. *<unk>  depression may be associated with subendocardial myocardial infarction, hypokalemia, or digitalis toxicity.
ST segment
T wave
QRS complex
P wave 
J wave
PR interval
U wave
QT interval