| AF | atrial fibrillation |
| Ag/AgCl | silver/silver chloride |
| BPM | beats per minute |
| CCS | chronic coronary syndrome |
| CVD | cardiovascular disease |
| HR | heart rate |
| HRV | heart rate variability |
| QIs | quality indexes |
| RMSSD | root mean square of successive differences between normal heartbeats |
| SD | standard deviation |
| SQI | signal quality indicator |
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