Tehran University of Medical Sciences Acta Medica Iranica 0044-6025 43 4 2005 08 15 306 308 V. Marsoosi 2015 09 28 As fetal compensation against hypoxemia progresses, the afterload on the heart and peripheral vascular resistance increases. Eventually, the right heart fails, which is transmitted to the fetal venous system, causing decreased flow during late diastole or atrial contraction and increased resistance in the ductus venosus and inferior vena cava. The ductus has forward flow during atrial contraction, the disappearance of which is always pathologic. This is a report of a case of retrograde ductus venosus atrio-wave in a fetus referred with decreased movement for fetal assessment. https://acta.tums.ac.ir/index.php/acta/article/view/3015 https://acta.tums.ac.ir/index.php/acta/article/download/3015/2996