29th World Congress on Ultrasound in Obstetrics and Gynecology Electronic poster abstracts Objectives: To observe the ultrasonographic image changes of Caesarean scar pregnancy among twin by fetocide in early pregnancy. Methods: Collect the total 3 cases of ultrasonographic and clinical datas for the patients with Caesarean scar pregnancy among twin by fetocide in early pregnancy from December 2017 to December 2018 in our hospital. Results: All patients had one history of Caesarean section before, this time is one Caesarean scar pregnancy among twin, with double chorionic double amniotic twins, ultimately they all were deliveryed in our hospital. They were fetocided transvaginal at 6-9 weeks of gestation, during pregnancy we focused on monitoring the implantation lesion in the fetocided position. Pregnancy was terminated by Caesarean section at 29/33/37 weeks according to scores of the ultrasounic scoring system which was designed by ourselves and their clinical manifestations, they were confirmed with placental percreta/percrata/accreta by operations. Their bleeding volume during opetation were 3000/1200/500ml respectively. All the patients retained their uterus and eventually the mother and babies recovered. The first patient had sinus in the inferior uterine, her scores had increased from 9 and 12 points when she was terminated emergency at 29 weeks due to antepartum hemorrhage for 3000ml. The other 2 patients had heterogeneous echo masses in the lower anterior wall of uterus in preoperative ultrasonography, scores of the second patient had rised from 9 to 13 points, so she was terminated at 33 weeks of gestation; There were no significant changes in scores for the third patient whose scores sustained between 4 and 5 points, she was terminated at 37 weeks. Conclusions: Ultrasound monitoring provides information on the timing of clinical termination of pregnancy for Caesarean scar pregnancy among twin by fetocide in early pregnancy, it has important application value. EP22.21 Screening for Caesarean scar pregnancy in pregnant women with history of previous Caesarean section M. Barati AJUMS, Ahwaz, Islamic Republic of Iran Due to probability of Caesarean scar pregnancy in every pregnant woman with history of even one previous Caesarean section, it is strongly suggested that early in pregnancy in these patients abdominal or vaginal scan for determination of the location of pregnancy is performed. Because there is no definite sign that indicates in which cases it is impossible to have Caesarean scar pregnancy, this screening scan should be performed for every previous caesarean section patients. Caesarean scar pregnancy may cause preventable morbidity or even mortality in mothers, so early diagnosis is mandatory. Many of these cases have no symptoms. So it is suggested that at least one scan at around 6 weeks of pregnancy is performed for determination of the location of pregnancy. If we are suspicious whether gestational sac is in the lower segment of uterus or not, it suggested to rescan in 1 week, and also even taking second opinion about the nature of the pregnancy. EP22.22 Matching of angiography and ultrasound picture in patients with abnormal placentation L. Teregulova 1,4 , A. Teregulov 2,3 , D. Gaiazov 2,3 1 Ultrasound, Republican Clinical Hospital of Ministry of Health of Tatarstan Republic, Kazan, Russian Federation; 2 X-ray Surgery, Republican Clinical Hospital of Ministry of Health of Tatarstan Republic, Kazan, Russian Federation; 3 Medical University of Kazan, Kazan, Russian Federation; 4 Medical Academy of Postgraduate Education, Kazan, Russian Federation Objectives: Determination of x-ray angiographic criteria in various forms of abnormal placentation and matching with ultrasound picture. Methods: Totally 49 patients with diagnosis of placenta previa at 32 to 37 weeks of pregnancy examined and treated. The average age was 30.8 years. In 45 (97.83%) of all re-pregnancies, previous delivery was performed by the CS and in 20 (44.44%) CS performed twice. Placenta previa found in all cases and ultrasound (US) signs of placental invasion visualised in 45 (91.84%) of them. All pregnant women underwent operative labour in angiographic operating room followed by digital subtraction angiography (DSA) of the internal iliac arteries and uterine arteries with embolisation of the vessels supplied the uterus. Results: According to the results of the placenta detachment patients divided into 3 groups: 1. placenta was completely removed, no bleeding (57.14%). On US: placental thickening visualised. Expansion of 2-3 level afferent arteries, hypervascularisation of soft tissues in the placentation zone found on DSA; 2. placenta not completely removed, some fragments left in the uterus (12.24%). On US: vascular lacunae with intensive blood flow, myometrial thinning, shortening of anterior lip of the cervix. DSA: small sites of contrast accumulation, aneurismal expansion of afferent arteries with heterogeneous contrast flow; 3. placental separation was impossible and hysterectomy performed (30.61%). On US: vascular lacunae with turbulent, high-speed blood flow, myometrial thinning less than 1 mm, shortening of anterior lip of the cervix, loss of the retroplacental ‘‘clear zone’’ and interruption of bladder line. DSA: one (large) or several areas with intensive accumulation of contrast, early contrasting of draining veins (2-3 seconds), pathological micro and macrofistular arteriovenous malformations. Conclusions: Ultrasound diagnosis: primary diagnostics for abnor- mal placentation but the angiographic picture allows evaluate vascular anatomy of the site of placentation, collateral blood flow and determine the further delivery tactics. EP23: ULTRASOUND IN THE LABOUR WARD EP23.01 Development of a new software for the automatic and non-invasive evaluation of labour progression parameters during contractions A. Dall’Asta 1 , F. Conversano 2 , M. Simone 4 , N. Volpe 3 , M. Di Paola 2 , G. Schera 1 , A. Ferretti 1 , P. Ricciardi 1 , E. Casciaro 2 , T. Frusca 1 , T. Ghi 1 1 Department of Medicine and Surgery, Obstetrics and Gynecology Unit, University of Parma, Parma, Italy; 2 National Research Council, Institute of Clinical Physiology, Lecce, Italy; 3 Department of Medicine and Surgery, Obstetrics and Gynaecology Unit, Parma University Hospital, Parma, Italy; 4 Amolab Srl, Lecce, Italy Objectives: The measurement of the AoP and the HPD can objectively detect those cases in which the mother cannot exert efficient pushing efforts, as their variations during the contractions are correlated with the efficiency of maternal pushing. However, the measurements of these parameters through the conventional ultrasound requires specific training. The aim of this study is to demonstrate the feasibility and the effectiveness of an innovative software for the automatic measurements of the AoP and the HPD.  The Authors 2019 384  Ultrasound in Obstetrics & Gynecology 2019; 54 (Suppl. 1): 224–462.