Pulse interval variability (ms) | SBP variability (mm Hg) | ||||||||
---|---|---|---|---|---|---|---|---|---|
Frequency ranges* | n | All Frequencies | VLF | LF | HF | All Frequencies | VLF | LF | HF |
*VLF=0.02–0.05 Hz; LF=0.05–0.15 Hz; HF=0.15–0.4 Hz; Data are presented as mean (SD) with 95% CI; p values are for the differences between stroke and control groups; two patients with stroke and three controls had too many ectopic beats on their ECG to be included in spectral analysis, therefore 51 pairs used in analysis. | |||||||||
Stroke | 51 | 28.8 (19.7) | 16.4 (12.7) | 13.0 (10.7) | 10.4 (7.4) | 6.6 (2.2) | 4.2 (1.8) | 2.6 (1.1) | 1.9 (0.9) |
Control | 51 | 31.2 (13.4) | 16.0 (7.6) | 14.6 (6.9) | 13.1 (7.7) | 5.7 (1.7) | 3.4 (1.2) | 2.5 (0.8) | 1.8 (0.9) |
Difference | 2.4 (23.9) | 0.4 (14.3) | 1.6 (13.4) | 2.7 (11.5) | 1.0 (2.9) | 0.8 (2.1) | 0.1 (1.4) | 0.2 (1.3) | |
95% CI | (−4.3 to 9.1) | (−4.0 to 3.6) | (−2.1 to 5.4) | (−0.6 to 5.9) | (0.2 to 1.8) | (−0.2 to −1.4) | (−0.5 to 0.3) | (−0.5 to 0.2) | |
p Value | 0.476 | 0.849 | 0.388 | 0.107 | 0.018 | 0.008 | 0.49 | 0.337 |