Fig. 3From: Non-invasive fetal electrocardiography, electrohysterography and speckle-tracking echocardiography in the second trimester: study protocol of a longitudinal prospective cohort study (BEATS-study)Placement of the abdominal patch. In all places where an electrode is placed, the skin must first slightly be abraded to achieve low skin impedance (source: user manual Nemo Fetal Monitoring System®)Back to article page