Type 1
Elevated ST segment (>2mm)
Descends with upward convexity to a TWI
Type 2
Elevated ST segment (>1mm)
Descends toward baseline then rises again (saddleback) to upright T wave
Type 3
Elevated ST segment (<1mm)
Descends toward baseline then rises again to upright T wave
Elevated ST segment (>2mm)
Descends with upward convexity to a TWI
Elevated ST segment (>1mm)
Descends toward baseline then rises again (saddleback) to upright T wave
Elevated ST segment (<1mm)
Descends toward baseline then rises again to upright T wave
v1-v2 lead placement in 2nd or 3rd IC spaces (rather than conventional 4th IC space) increases chance of recording type I pattern
Type 1 ECG findings can be transient and "unmasked" by the following:
Fever
Night time
After heavy meals
Recovery phase of exercise
Fever
Night time
After heavy meals
Recovery phase of exercise
Early repolarization with J-point elevation in inferior leads (seen in 10% of<unk> 
QRS widening > 120 ms in V2
QRS fragmentation (additional QRS complex spikes)
ST elevation during recovery after exercise
Diagnosed when a patient has Burdada's ECG pattern (see above) AND documented ventricular tachydysrhythia or history consistent with ventricular tachydysrythmia (e.g. syncope, sudden cardiac death)
Brugada syndrome
Cardiac
Vincent's angina
ST-segment elevation myocardial infarction 
Torsades de pointes
Post-MI 
Takotsubo cardiomyopathy
Previous MI with recurrent ischemia in same area