12 February 2022: Clinical Research
Autonomic Tone Variations Prior to Onset of Paroxysmal Atrial Fibrillation
Xia Zhong 1ABCDEF* , Huachen Jiao 2ACDFG* , Jinchao Gao 3ABCD , Jing Teng 1DEFDOI: 10.12659/MSM.934028
Med Sci Monit 2022; 28:e934028
Table 1 Time and frequency domain parameters.
| Variable | Units | Definition |
|---|---|---|
| SDNN | ms | Standard deviation of all BBI values |
| RMSSD | ms | Root mean square of successive BBI differences |
| PNN50 | % | Percentage of NN-interval differences greater than 50 ms |
| LF | ms | Low-frequency band 0.04–0.15 Hz |
| HF | ms | High-frequency band 0.15–0.40 Hz |
| LF/HF | None | Quotient of LF and HF |
| BBI stands for NN intervals (filtered beat-to-beat intervals). | ||