ECG and long axis values at rest and peak stress
| Controls (n = 17) | Patients (n = 27) | ||||
|---|---|---|---|---|---|
| Variables | Rest | Change with stress | Rest | Change with stress | |
| Heart rate (beats/min) | 80 (12) | +45 (12)*** | 81 (10) | +42 (15)*** | |
| Blood pressure | |||||
| Systolic | 147 (15) | +11 (10)** | 152 (28) | −1 (20) | |
| Diastolic | 76 (10) | −7 (12) | 87 (15)†† | −10 (15)*** | |
| Rate-pressure product | 115 (16) | +86 (24)*** | 124 (27) | +65 (32)*** | |
| ECG intervals | |||||
| PR interval (ms) | 160 (22) | −36 (18)*** | 175 (24)2-151 | −50 (28)*** | |
| QRS duration (ms) | 93 (6) | −9 (4)*** | 95 (12) | +16 (18)2-150 | |
| QT interval (ms) | 368 (32) | −72 (26)*** | 369 (30) | −50 (33)*** | |
| QTc (ms) | 432 (13) | −25 (16)*** | 420 (17) | +50 (35)*** | |
| QT dispersion | 82 (28) | −12 (48) | 98 (46) | −15 (57) | |
| Long axis | |||||
| Total excursion (cm) | |||||
| Left | 1.36 (0.1) | +0.27 (0.13)*** | 1.2 (0.3)2-151 | +0.08 (0.3) | |
| Septal | 1.3 (0.15) | +0.22 (0.1)*** | 1.0 (0.3)†† 2-151 | +0.04 (0.24) | |
| Peak lengthening rate (cm/s) | |||||
| Left | 8.7 (1.6) | +2.7 (0.9)*** | 4.0 (0.4)†† 2-151 | −0.01 (1.2) | |
| Septal | 7.3 (1.3) | +2.2 (1.6)*** | 3.5 (2.2)†† 2-151 | −0.8 (1.5)2-150 | |