Table 6. ECG findings useful for establishing the likelihood of coronary artery disease

Finding            Most likely cause      Alternate causes
_____________________________________________________________
ST-segment         Acute MI               Acute
elevation >e;1 mm                          pericarditis
in two or more                            Early
contiguous leads                          repolarization
                                          Left ventricular
                                          aneurysm
                                          Coronary spasm
_____________________________________________________________
ST-segment         Ischemia or acute MI   Normal heart
depression >e;1                            Hyperventilation
mm                                        LV hypertrophy
                                          with strain
                                          Digitalis
                                          Hypokalemia
                                          Hypomagnesemia
_____________________________________________________________
Inverted T-waves   Ischemia or acute MI   Normal heart
in two or more                            Central nervous
contiguous leads                          system disease
(>e;1 mm in leads                          Hypertrophic
with dominant R                           cardiomyopathy
waves, or marked
symmetrical precordial
T-wave inversion)