| Excluded patients (n = 48) | Latent obstruction (n = 54) | Non-obstructive (n = 33) | ||
| Clinical parameters | ||||
| Age (years) | 42.8 (11.8) | 40.6 (15.5) | 45.0 (12.4) | |
| Males | 37 (77.1%) | 41 (75.9%) | 18 (54.5%) | |
| Exertional chest pain | 26 (54.2%) | 25 (46.3%) | 15 (45.5%) | |
| Atypical chest pain | 4 (8.3%) | 6 (11.1%) | 3 (9.1%) | |
| NYHA I | 16 (33.0%) | 20 (37.0%) | 12 (36.4%) | |
| NYHA II | 21 (43.8%) | 21 (38.9%) | 14 (42.4%) | |
| NYHA III/IV | 7 (14.6%) | 6 (11.1%) | 6 (18.2%) | |
| Palpitations | 11 (22.9%) | 17 (31.5%) | 11 (33.3%) | |
| Presyncope/syncope | 26 (54.2%) | 30 (55.6%) | 15 (45.5%) | |
| Echocardiographic parameters | ||||
| Maximal left ventricular wall thickness (mm) | 21.5 (4.3) | 20.7 (5.4) | 21.6 (6.9) | |
| Lest atrial diameter (mm) | 47.0 (6.3) | 44.8 (7.9) | 44.7 (6.9) | |
| Left ventricular end diastolic diameter (mm) | 43.7 4.2) | 42.8 (4.8) | 43.9 (6.8) | |
| Left ventricular end systolic diameter (mm) | 23.9 (4.5) | 24.0 (5.0) | 25.3 (5.8) | |
| Fractional shortening | 45.5 (7.1%) | 44.4 (8.6%) | 42.6 (5.7%) | |
| Resting incomplete SAM | 20 (41.7%) | 36 (66.7%) | 16 (48.5%) | |
| Resting complete SAM | 28 (58.3%) | 5 (9.3%) | 0 (0%) | |
| Mild mitral regurgitation at rest | 30 (22.2%) | 22 (16.3%) | 11 (8.1%) | |
| Moderate mitral regurgitation at rest | 14 (10.4%) | 5 (3.7%) | 3 (2.2%) | |
| Severe mitral regurgitation at rest | 3 (2.2%) | 0 (0.0%) | 2 (1.5%) | |
| Wigle score | 6.2 (2.2) | 4.8 (2.6) | 5.3 (1.9) | |
| Left ventricular outflow diameter (mm) | 17.2 (2.3) | 17.4 (2.5) | 18.8 (3.5) | |
| E:A | 1.3 (0.5) | 1.4 (0.6) | 1.3 (0.4) | |
| Resting left ventricular outflow tract gradient (mm Hg) | 57.7 (19.2) | 15.4 (8.7) | 10.1 (5.5) |
All values expressed as mean (SD) or as n (%); NYHA, New York Heart Association; SAM, systolic anterior motion of the mitral valve; E:A, E-wave to A-wave ratio from mitral valve inflow Doppler.