Scatterplots showing preoperative and postoperative echocardiographic measurements of the AML-annulus ratio and tenting area in patients with important (≥ 20 mm) and patients with mild (≤ 19 mm) septal hypertrophy. (A) AML-annulus ratio postoperative values are, on average, superimposable in the two study groups, and systematically higher than the preoperative values in the great majority of patients. (B) Tenting area postoperative values are, on average, superimposable in the two study groups, and systematically lower than the preoperative values in the great majority of patients.