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Annotations in the MIT-BIH Malignant Ventricular Fibrillation Database
All of the annotations contained in the .atr files of this database are rhythm change annotations, and almost all of them mark changes in cardiac rhythm (a few indicate episodes of noise or asystole). The table below indicates how the aux strings of these annotations should be interpreted.
| aux string | Meaning |
|---|---|
| (AFIB | atrial fibrillation |
| (ASYS | asystole |
| (B | ventricular bigeminy |
| (BI | first degree heart block |
| (HGEA | high grade ventricular ectopic activity |
| (N or (NSR | normal sinus rhythm |
| (NOD | nodal ("AV junctional") rhythm |
| (NOISE | noise |
| (PM | pacemaker (paced rhythm) |
| (SBR | sinus bradycardia |
| (SVTA | supraventricular tachyarrhythmia |
| (VER | ventricular escape rhythm |
| (VF or (VFIB | ventricular fibrillation |
| (VFL | ventricular flutter |
| (VT | ventricular tachycardia |
In each case, the rhythm change annotations are placed at the beginning of the episode of the indicated rhythm. The previous rhythm continues during episodes marked by (NOISE; the noise ends at the time of the next annotation.