Table 1

Characteristics of Study Population: Clinical, Echocardiography, CMR, and Pathology Data (n = 29)

Age at myectomy, yrs50 ± 15 (23−77)
Women11 (38)
Mean LVEF (CMR), %65 ± 6
Mean resting LVOT gradient, mm Hg57 ± 34
Mean maximum LVOT gradient, mm Hg96 ± 28
Mean basal interventricular septal thickness (CMR), mm20.1 ± 4.0
LV mass (CMR), g175.3 ± 63.7
LVMI (CMR), g91.0 ± 30.8
CMR-LGE at 10 SD (% of myectomy site)1.9 ± 2.2
CMR-LGE at 6 SD (% of myectomy site)7.8 ± 7.7
CMR-LGE at 5 SD (% of myectomy site)10.9 ± 9.0
CMR-LGE at 4 SD (% of myectomy site)16.5 ± 12.0
CMR-LGE at 2 SD (% of myectomy site)38.5 ± 19.2
CMR-LGE at FWHM (% of myectomy site)10.6 ± 6.4
Myectomy (pathology), g6.9 ± 2.9
Replacement fibrosis (scar) at histopathology (% of myectomy)1.8 ± 2.7
Interstitial fibrosis at histopathology (% of myectomy)14.4 ± 4.9
Interstitial fibrosis and replacement fibrosis (scar) combined at histopathology (% of myectomy)16.2 ± 6.0

Values are mean ± SD (range) or n (%).

CMR = cardiac magnetic resonance; FWHM = full with half maximum; LGE = late gadolinium enhancement; LV = left ventricular; LVEF = left ventricular ejection fraction; LVMI = left ventricular mass index; LVOT = left ventricular outflow tract.