Figure 1From: Left ventricular torsion shear angle volume analysis in patients with hypertension: a global approach for LV diastolic functionSchematic diagram for calculating torsion hysteresis area. Torsion hysteresis area represents the area within the systolic and diastolic arm of the normalized torsion shear angle-volume φ ^ V ^ curves. Red curve, diastolic arm; blue curve, systolic arm; red dot, end systole mark; black triangle, 67% of diastole mark; black downward arrow indicates the peak −d φ ^ /d V ^ at early diastole.Back to article page