Response to Letter Regarding Article, “Magnetic Resonance Imaging With 3-Dimensional Analysis of Left Ventricular Remodeling in Isolated Mitral Regurgitation: Implications Beyond Dimensions”

We thank Drs Vallakati and Sharma for their comments and appreciate their interest in our work.1 As pointed out, we demonstrated the Bullet formula underestimates left ventricular end-systolic volume, and further analysis does indeed demonstrate the mean Bullet formula–calculated left ventricular ejection fraction is significantly higher than left ventricular ejection fraction measured by magnetic resonance imaging (67%±9% versus 61%±7%, P <0.0001). Referral echocardiograms in …