Table 2.

Impact of inclusion or exclusion of the papillary muscles on LV ejection fraction and mass

Clinical HCM ( n  = 55)
	Exclusion of PMs from LV mass	Inclusion of PMs in LV mass	Absolute difference	Relative difference a
LVEF (%)	58.2 ± 7.2	60.8 ± 7.6	2.6 ± 1.1	4.5 ± 1.8
LV mass (g/m 2 )	78.5 ± 28.4	85.2 ± 30.3	6.6 ± 2.5	8.7 ± 2.6
Subclinical HCM mutation carriers ( n = 14)
	Exclusion of PMs from LV mass	Inclusion of PMs in LV mass	Absolute difference	Relative difference a
LVEF (%)	57.8 ± 6.1	60.0 ± 6.5	2.2 ± 0.7	3.8 ± 1.0
LV mass (g/m 2 )	42.7 ± 9.9	46.7 ± 10.5	4.0 ± 0.9	9.5 ± 1.8

Data are presented as mean ± standard deviation. Within group differences: p < .01.LV left ventricle, EF ejection fraction, PMs papillary muscles, HCM hypertrophic cardiomyopathy.^aRelative differences in LVEF and mass are both indicated in percentages.