Table 5.
Clinical characteristics of the coronary stenosis <70% SCAD group and coronary stenosis ≥70% SCAD group.
| Stenosis <70%(n = 25) | Stenosis ≥70%(n = 38) | P value | |
|---|---|---|---|
| Age (years) | 61.96 ± 6.02 | 61.79 ± 6.22 | 0.914 |
| Male sex (n, %) | 12/25 (48.0%) | 24/38 (63.2%) | 0.234 |
| Smoker (n, %) | 8/25 (32.0%) | 15/38 (39.5%) | 0.547 |
| BMI (kg/m2) | 24.90 ± 4.08 | 24.06 ± 2.80 | 0.377 |
| Hypertension (n, %) | 18/25 (72.0%) | 29/38 (76.3%) | 0.700 |
| DM (n, %) | 1/25 (4.0%) | 5/38 (13.2%) | 0.440 |
| Dyslipidaemia (n, %) | 20/25 (80.0%) | 34/38 (89.5%) | 0.494 |
| Cr (μM) | 72.84 ± 17.44 | 70.73 ± 12.22 | 0.574 |
| CHOL (mM) | 4.55 ± 1.04 | 4.63 ± 1.31 | 0.773 |
| TG (mM) | 1.51 ± 0.61 | 2.05 ± 1.61 | 0.407 |
| LDL-c (mM) | 2.85 ± 0.89 | 2.88 ± 1.18 | 0.768 |
| HDL-c (mM) | 1.10 ±0.28 | 1.00 ± 0.23 | 0.136 |
| Ejection fraction (%) | 61.04 ± 5.83 | 61.29 ± 6.06 | 0.795 |
| Gensini score | 7.66 ± 5.01 | 26.40 ± 22.68 | 0.000 |
| Heart rate before Ex (bpm) | 79.32 ± 11.65 | 84.24 ± 12.18 | 0.116 |
| Peak heart rate (bpm) | 138 ± 6.20 | 137.63 ± 6.53 | 0.824 |
| HRR1 (bpm) | 26.08 ± 7.93 | 22.97 ± 8.18 | 0.141 |
| HRR1 ≤24 bpm (n, %) | 13/25 (52.0%) | 24/38 (63.2%) | 0.379 |
| HRR2 (bpm) | 45.68 ± 8.38 | 39.82 ± 11.90 | 0.037 |
| HRR2 ≤42 bpm (n, %) | 10/25 (40.0%) | 24/38 (63.2%) | 0.071 |
| HRR3 (bpm) | 50.20 ± 8.78 | 44.90 ± 11.46 | 0.054 |
| HRR4 (bpm) | 52.92 ± 9.39 | 47.29 ± 10.33 | 0.032 |
| HRR5 (bpm) | 55.16 ± 10.23 | 48.63 ± 10.77 | 0.019 |
| SDNN (ms) | 118.92 ± 18.79 | 113.37 ± 30.46 | 0.375 |
| SDANN( ms) | 108.12 ± 19.60 | 102.71 ± 30.87 | 0.398 |
| RMSSD (ms) | 23.28 ± 7.79 | 21.34 ± 4.47 | 0.267 |
| pNN50 (%) | 4.29 ± 4.78 | 2.91 ± 2.10 | 0.806 |
| VLF (ms) | 24.58±6.00 | 24.33 ± 5.79 | 0.869 |
| LF (ms) | 13.92 ± 4.55 | 13.54 ± 3.71 | 0.721 |
| HF (ms) | 9.39 ± 2.95 | 8.63 ± 2.19 | 0.255 |
| LF/HF | 1.51 ± 0.30 | 1.60 ± 0.38 | 0.304 |
| Beta-blocker use (n, %) | 14/25 (56.0%) | 23/38 (60.5%) | 0.721 |
Values are expressed as n (%) or mean ± SD. Abbreviations: SCAD, stable coronary artery disease; BMI, body mass index; DM, diabetes mellitus; Cr, creatinine; CHOL, cholesterol; TG, triglycerides; LDL,c, low-density lipoprotein cholesterol; HDL,c, high-density lipoprotein cholesterol; Ex, treadmill exercise; HRR, heart rate recovery; HRRn, heart rate recovery at n minutes post-exercise; SDNN, standard deviation of NN intervals; SDANN, standard deviation of all 5,minute mean NN intervals; RMSSD, root mean square of successive differences; pNN50, the proportion derived by dividing the number of interval differences of successive NN intervals greater than 50 ms by the total number of NN intervals; VLF, very-low-frequency power; LF, low-frequency power; HF, high-frequency power.