Table 2. Characteristics of ACh provocation test in general study population.
| Variables | NTN (n=301) | HTN (n=685) | P-value |
|---|---|---|---|
| Reference diameter after NTG infusion (mm) | 2.66±0.59 | 2.58±0.54 | 0.119 |
| Reference diameter after ACh infusion (mm) | 1.81±0.47 | 1.84±0.49 | 0.504 |
| Diameter narrowing after ACh infusion (%) | 39.39±32.75 | 37.64±34.42 | 0.729 |
| Acetylcholine-induced significant CAS, n (%) | 118 (39.2) | 245 (35.8) | 0.303 |
| ST-segment change, n (%) | 18 (6.0) | 43 (6.3) | 0.858 |
| Chest pain, n (%) | 137 (45.5) | 284 (41.5) | 0.236 |
| Atrioventricular block, n (%) | 73 (24.3) | 161 (23.5) | 0.799 |
| Myocardial bridge, n (%) | 73 (24.3) | 163 (23.8) | 0.877 |
Abbreviations: NTG, nitroglycerine; ACh, acetylcholine; CAS, coronary artery spasm.