Objectives Myocardial tissue Doppler (MTD) is

SP mobility is reduced in fetuses over 30 weeks with IUGR compared with AGA fetuses. These findings may depend on alterations of left ventricular diastolic function and are correlated to the degree of placental insufficiency.

Oral communication abstracts Objectives: Myocardial strain measures fractional change in ventricular wall dimension and allows quantification of myocardial performance. Quintero scoring for twin-twin transfusion syndrome (TTTS) cannot predict those who progress rapidly from stage 1 to intrauterine demise. We used vector-velocity imaging (VVI) which tracks natural myocardial speckles to calculate ventricular strain and determine whether this might aid risk stratification. Methods: We captured VVI images at about 100 Hz from a four chamber view during routine fetal echocardiograms in a pilot study of uncomplicated monochorionic twin pregnancies (MCDA) and ones with TTTS. Ventricular strain was calculated off-line and compared with our singleton reference range. Results: 33 MCDA pregnancies were studied at gestational age 21 + 5 (13 + 3 to 32 + 2) weeks. 20 pregnancies had TTTS (stages