Echocardiographic and integrated backscatter variables
| Control group (n=14) | Patients with DMD (n=25) | p Value | |
| Age (years) | 16.1 (4.8) | 17.6 (2.7) | NS |
| Weight (kg) | 49.5 (9.4) | 35.8 (11.6) | < 0.001 |
| Heart rate ( bpm) | 68 (11) | 86 (13) | < 0.001 |
| LVd (mm) | 43.8 (6.9) | 48.9 (9.4) | < 0.005 |
| SF (%) | 35.6 (3.8) | 22.8 (9.7) | < 0.001 |
| IBS parameters | |||
| CVin (dB) | 9.6 (2.4) | 6.1 (2.1) | < 0.001 |
| CVout (dB) | 8.4 (1.9) | 4.5 (2.1) | < 0.001 |
| dif CV (dB) | 1.3 (1.3) | 1.5 (1.4) | NS |
| cIBSin (dB) | 11.4 (3.5) | 15.3 (4.6) | < 0.01 |
| cIBSout (dB) | 14.3 (4.3) | 25.2 (6.3) | < 0.001 |
| dif IBS (dB) | 2.9 (1.8) | 9.9 (5.0) | < 0.001 |
Data presented are mean value (SD). LVd=left ventricular internal dimension at end diastole; SF=shortening fraction of the left ventricle; CVin=cyclic variation for the inner half of the left ventricular posterior wall; CVout=cyclic variation for the outer half of the left ventricular posterior wall; dif CV (difference between CVin and CVout)=CVin−CVout; cIBSin=mean value of IBS for the inner half of the left ventricular posterior wall − mean value of IBS for the left ventricular cavity; cIBSout=mean value of IBS for the outer half of the left ventricular posterior wall − mean value of IBS for the left ventricular cavity; dif IBS (difference between IBSout and IBSin) = cIBSout − cIBSin