Abstract
660 661 THE GENETIC SONOGRAM: HOW DOES FETAL ANATOMIC VISUALIZATION DEPEND UPON DURATION OF THE SCAN? VAL CATANZARITE, KIM DELANEY, SUSAN WOLFE, DAVID DOWLING, SEAN DANESHMAND, DEBRA POELTER, LARRY COUSINS, San Diego Perinatal Center, San Diego, CA Sharp Mary Birch Hospital for Women, Biostatistics, San Diego, CA OBJECTIVE: To determine the relationship between visualization of key fetal anatomic structures during genetic sonography with increasing gestational age and increasing duration of examination. STUDY DESIGN: One hundred genetic sonograms performed at 16-22 weeks’ gestation were reviewed to determine the times at which key fetal anatomic features were seen. Scans were terminated at 30 minutes or when a comprehensive fetal anatomic survey was complete. Exclusion criteria included maternal weight >170 pounds, abdominal wall scarring, and suspected fetal anomalies. RESULTS: Visualization of cranial anatomy including lips, face, midline, ventricles, choroid, and cerebellum was obtained in 98 patients by 30 minutes. Corresponding figures for spine, cardiac screening (4-chamber, aortic, and pulmonic outflow views) and for abdominal anatomy (stomach, kidneys, bladder, ventral wall, and 3-vessel cord) were 91, 91, and 99 cases, respectively. A completed anatomic survey, including each of the above elements, was obtained by 10, 15, 20, 25, and 30 minutes in 8, 31, 53, 72, and 81 cases, respectively. Rates of competed anatomic surveys within 30minutes improved by gestational age interval, from 20/30 (67%) at 16-18 weeks, to 36/44 (82%) at 1820 weeks, and 25/26 (96%) at 20-22 weeks; this rise was primarily due to improvements in visualization of the spine and heart. CONCLUSION: A comprehensive genetic sonogram including a compreDecember 2003 Am J Obstet Gynecol S238 SMFM Abstracts
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