{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,16]],"date-time":"2026-07-16T11:08:47Z","timestamp":1784200127198,"version":"3.55.0"},"reference-count":23,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2015,1,1]],"date-time":"2015-01-01T00:00:00Z","timestamp":1420070400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["J of Ultrasound Medicine"],"published-print":{"date-parts":[[2015,1]]},"abstract":"<jats:sec><jats:title>Objectives<\/jats:title><jats:p>The purpose of our study was to assess the factors that may improve the feasibility of routine fetal echocardiography at the time of the first\u2010trimester scan.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>In this prospective study, we included 616 healthy singleton fetuses. Examinations were performed transabdominally by a single sonographer at the beginning of his training in first\u2010trimester screening. The fetal heart was examined by high\u2010definition color Doppler imaging to obtain the 4\u2010chamber view, right and left ventricular outflow tracts, and 3\u2010vessel and trachea view. Logistic regression was used to investigate the effect on the ability to visualize different cardiac structures.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The frequency of successful heart examinations increased significantly with the number of scans performed (<jats:italic>P<\/jats:italic> &lt; .05). The sonographer needed 180 examinations before he could successfully examine the heart in at least 80% of cases. Significant factors that increased the probability of adequate echocardiography were the length of the heart examination and the experience of the sonographer (<jats:italic>P<\/jats:italic>&lt; .05) but not transducer\u2010heart distance, maternal body mass index, fetal crown\u2010rump length, placenta interposition, or restrictive fetal position. Visualization of the left ventricular outflow tract could be improved by increasing the experience of the sonographer and decreasing the transducer\u2010heart distance. Also, visualization of the 3\u2010vessel and trachea view depended on the length of the heart examination, the experience of the sonographer, an anterior position of the placenta, and a restrictive fetal position.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Competence in color flow mapping assessment of the fetal heart at gestational ages of 11 weeks to 13 weeks 6 days is achieved only after extensive supervised training.<\/jats:p><\/jats:sec>","DOI":"10.7863\/ultra.34.1.161","type":"journal-article","created":{"date-parts":[[2014,12,26]],"date-time":"2014-12-26T21:02:45Z","timestamp":1419627765000},"page":"161-166","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":21,"title":["Factors Affecting the Feasibility of Routine First\u2010Trimester Fetal 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