Left ventricular time movement ™ mode providing left ventricular dimensions in tracheotomized DMD patient on permanent HMV. 2: cardiac measurements during insufflation cycle; 1: cardiac measurement during non-insufflation phase. VGd: left ventricular end-diastolic diameter; FE: left ventricular ejection fraction; Vol.Teled: left ventricular end-diastolic volume; Vol. Télés: left ventricular end-systolic volume. HMV: home mechanical ventilation.