E-Table. Definitions of ECG diagnoses based on the 12SL-Code (version MAC5K 12SL229).
| ECG diagnosis | Digital ECG code*1 |
| Normal ECG | #1684 (= normal ECG) |
| #1687 (= otherwise normal ECG)*2 | |
| Borderline ECG | #1687, #1693, #1694 |
| Abnormal ECG | #1699 |
| Normal SR (50<HR<100 bpm) | According to HR |
| Atrial fibrillation/flutter | #161, #162 |
| Frequent premature contractions | #181, #231, #232, #241, #243 [only when in combination with #212 (= with frequent)] |
| Left axis deviation (LAxD) | QRS axis more negative than -30° |
| AV block | #101 (= 1st°), #103 (= 2nd° Mobitz I), #104 (= 2nd° Mobitz II), #105 (= 2nd°), #106 (= 3rd°), #107 (= variable AV block), #480 (=bifascicular block) |
| BBB (complete) | #440, #460 (= complete right or left BBB) |
| BBB (incomplete)*3 | #450 (= rSr' or qR pattern in V1) |
| #445, #465 (= incomplete right or left BBB), | |
| #470, #471 (= left anterior and posterior fascicular block) | |
| LVH | #540 (= voltage criteria for LVH), #541 (LVH) |
| Borderline LVH | #542 (= minimal criteria for LVH; can be normal) |
| #548 (= moderate voltage criteria for LVH; can be normal) | |
| ST-segment depression | #1002 (junctional ST depression, presumably abnormal) |
| #1022*4 (ST depression, due to ischemia or digitalis) | |
| #1040-1081 (clear, ischemia-like ST abnormality in multiple leads) | |
| T-wave changes | #1140, #1141 (nonspecific T-wave or ST and T-wave abnormality) |
| #1142 (abnormal QRS-T angle, T-wave abnormality), #1182 (T-wave inversion), | |
| #1145-1181 (clear ischemia-like T-wave abnormality in multiple leads) | |
| Abnormal T axis | T axis: -180° to -15° or 105° to 180° |
| Long QT | QTc >440ms,*5 QTc (Bazett's formula) |
| Signs of ischemia*6 | #900, #904, #1021, #1023 (nonspecific ST changes)*7, #1140*7, #1141*7, #1145, #1181 |
| #1020*4, #1022*4 (ST changing/depression, possible digitalis effect) | |
| #1040-#1081 (see further above) | |
| #1142 (abnormal QRS-T angle, T-wave abnormality) | |
| Signs of infarction | #700-#829 (infarct in multiple leads) |
| #963-#968 (ST elevation, injury pattern or infarct) | |
| Major ECG findings | #161, #162, #1040-1081, #1145-#1182, #103-#106, #440, #460 (#181, #231, #232, #243 [only when in combination with #212 (= with frequent)] |
The "#" symbol signifies that the following number is a code number.
*1 The most important codes are listed; further statements provide additional details, e.g., anterior leads (#1451).
*2 Classified as normal only when the only other finding is bradycardia.
*3 Not including #482 and #487 (nonspecific intraventricular conduction block or delay)
*4 Persons who are digitalized were excluded.
*5 Persons with QRS interval >120 ms or with atrial fibrillation/flutter were excluded.
*6 Persons with pacemakers or QRS interval >120 ms were excluded.
*7 If it cannot be attributed to LVH, IV block (#482), (in)complete BBB, or digitalis effect
SR, sinus rhythm; HR, heart rate; AV, atrioventricular; BBB, bundle branch block; LVH, left ventricular hypertrophy. Major ECG findings: ST depression, T-wave inversion, complete or incomplete AV block, frequent premature ventricular contractions or atrial fibrillation/flutter.