Ronald Reagan UCLA Medical Center 1 article published in JoVE Developmental Biology Displacement Analysis of Myocardial Mechanical Deformation (DIAMOND) Reveals Segmental Heterogeneity of Cardiac Function in Embryonic Zebrafish Junjie Chen1, René R. Sevag Packard1,2,3 1Division of Cardiology, Department of Medicine, David Geffen School of Medicine at University of California, Los Angeles, 2Ronald Reagan UCLA Medical Center, 3Veterans Affairs West Los Angeles Medical Center The goal of this protocol is to detail a novel method for the assessment of segmental cardiac function in embryonic zebrafish under both physiological and pathological conditions.