Feasibility of using Auto Mod‐ MPI system, a novel technique for automated measurement of fetal modified myocardial performance index

Objectives To evaluate the reproducibility of measurement of the fetal left modified myocardial performance index (Mod‐ MPI ) determined using a novel automated system . Methods This was a prospective study of 116 ultrasound examinations from 110 normal singleton pregnancies at 12 + 1 to 37 + 1 weeks' gestation. Two experienced operators each measured the left Mod‐ MPI twice manually and twice automatically using the Auto Mod‐ MPI system. Intra‐ and interoperator reproducibility were assessed using intraclass correlation coefficients ( ICCs ) and the manual and automated measurements obtained by the more experienced operator were compared using Bland–Altman plots and ICCs . Results Both operators successfully measured the left Mod‐ MPI in all cases using the Auto Mod‐ MPI system. For both operators, intraoperator reproducibility was higher when performing automated measurements ( ICC  = 0.967 and 0.962 for Operators 1 and 2, respectively) than when performing manual measurements ( ICC  = 0.857 and 0.856 for Operators 1 and 2, respectively). Interoperator agreement was also better for automated than for manual measurements ( ICC  = 0.930 vs 0.723, respectively). There was good agreement between the automated and manual values measured by the more experienced operator . Conclusions The Auto Mod‐ MPI system is a reliable technique for measuring fetal left Mod‐ MPI and demonstrates excellent reproducibility. Copyright © 2013 ISUOG. Published by John Wiley & Sons Ltd .