Table 1.
Patient Characteristics
| Patients With an MB (n=55) | Controls (n=50) | P Value | |
|---|---|---|---|
| Age, y | 42.5±16.0 | 46.3±13.8 | 0.14 |
| Male (%) | 20 (36) | 19 (38) | 0.86 |
| BSA, m2 | 1.8±0.2 | 1.8±0.2 | 0.82 |
| Hypertension, n (%) | 10 (18) | 8 (16) | 0.67 |
| Medication | |||
| Beta blocker, n (%) | 22 (40) | 0 (0) | <0.001 |
| Calcium blocker, n (%) | 5 (9) | 0 (0) | 0.03 |
| Nitroglycerin, n (%) | 11 (20) | 4 (8) | 0.003 |
| At rest | |||
| Hemodynamics | |||
| Heart rate, bpm | 67.0±10.4 | 71.2±11.6 | 0.05 |
| Systolic BP, mm Hg | 120.3±14.2 | 114.3±10.2 | 0.05 |
| Diastolic BP, mm Hg | 72.6±8.9 | 69.7±9.9 | 0.12 |
| Double product | 7675±2476 | 8130±1480 | 0.56 |
| Echocardiography | |||
| IVSd, mm | 8.8±1.8 | 9.1±1.3 | 0.34 |
| PWd, mm | 9.0±1.2 | 9.1±1.2 | 0.34 |
| LV dimension, cm | 4.4±0.3 | 4.3±0.5 | 0.06 |
| SVI, mL/m2 | 31.9±6.1 | 29.0±8.8 | 0.09 |
| LVEF, % | 62±4.8 | 63±3.6 | 0.21 |
| LA dimension, cm | 3.3±0.6 | 3.3±0.5 | 0.88 |
| At peak stress | |||
| Hemodynamics | |||
| Heart rate, bpm | 167.6±18.9 | 167.4±18.5 | 0.95 |
| Systolic BP, mm Hg | 164.1±21.5 | 156.3±14.2 | 0.13 |
| Diastolic BP, mm Hg | 77.8±13.4 | 72.7±13.5 | 0.60 |
| Double product | 27 051±6136 | 26 145±3640 | 0.19 |
| Echocardiography | |||
| SVI, mL/m2 | 27.7±6.2 | 22.1±5.7 | <0.001 |
| LVEF, % | 70±6.2 | 74±4.5 | 0.001 |
| Chest pain, n (%) | 33 (60) | 0 (0) | <0.001 |
| ST‐segment change in ECG, n (%) | 13 (24) | 0 (0) | <0.001 |
BP indicates blood pressure; bpm, beats per minutes; BSA, body surface area; IVSd, diastolic interventricular septum; LA, left atrial; LV, left ventricular; LVEF, left ventricular ejection fraction; MB, myocardial bridge; PWd, diastolic posterior wall; SVI, stroke volume index.