Classifications used by the Minnesota Code
| Minnesota Code | ECG abnormality |
|---|---|
| 1-1-1 . . . . . .1-3-6 | Q waves |
| 2-1 . . . . . .2-5 | QRS axis deviation |
| 3-1 . . . . . .3-3 | High amplitude R waves |
| 4-1-1 . . . . . .4-4 | ST junction (J) and segment depression |
| 5-1 . . . . . .5-4 | T wave items |
| 6-1 . . . . . .6-8 | A-V conduction defect |
| 7-1-1 . . . . . .7-8 | Ventricular conduction defect |
| 8-1-1 . . . . . .8-9 | Arrhythmias |
| 9-1 . . . . . .9-8-2 | Miscellaneous including ST segment elevation (9-2) |
Codes 1, 4, 5, and 9-2 (ST elevation) are grouped by leads, resulting in three subclassifications of anterolateral, posterior (inferior) and anterior.