Doppler Interrogation of the Fetal Circulation
INTRODUCTION Print Section Listen This chapter focuses on the Doppler interrogation of the fetal circulation. Other chapters in this book focus on Doppler velocimetry of the uterine arteries and fetal…
Sonography in Multiple Gestation
KEY TERMS Print Section Listen Key Terms Monozygotic twins: a pregnancy of 2 fetuses derived from the same zygote that divided between the day of fertilization and the 14th day….
Color Doppler Sonography in Obstetrics
KEY TERMS Print Section Listen Key Terms Aliasing: aliasing of a Doppler signal occurs when the Nyquist limit has been exceeded. This resulting “wrapped around” appearance of either the pulsed…
Transvaginal Sonography of Early (First Trimester) Intrauterine Pregnancy
KEY TERMS Print Section Listen Key Terms Embryo: conceptus during early (<8 weeks) development when most organs are being formed. Fetus: conceptus during which time organs enlarge (>8 weeks). Subchorionic…
Transvaginal Sonography of Ectopic Pregnancy
KEY TERMS Print Section Listen Key Terms Ectopic pregnancy: a gestational sac located outside of the uterine lumen. The most common location is within the ampullary segment of the fallopian…
Placenta, Cord, and Membranes
KEY TERMS Print Section Listen Key Terms Basal plate: maternal surface of placenta. Chorioangioma: benign tumors arising from the fetal surface of the placenta. Chorionic plate: fetal surface of placenta….
Doppler Ultrasonography For the Diagnosis and Management of Fetal Anemia, Hydrops, and Fetal Lung Maturity
FETAL ANEMIA Print Section Listen Anemia continues to be an uncommon, but life-threatening, condition to the developing fetus. Red cell alloimmunization has historically been the most common cause of fetal…
Ultrasound evaluation in the modern labor delivery unit: an important diagnostic and management tool
INTRODUCTION Print Section Listen The last 3 decades have seen ultrasound evaluation become an integral part of obstetrics and gynecology. This diagnostic tool plays an essential role in the management…
Uterine Artery Doppler
KEY TERMS Print Section Listen Key Terms Diastolic notch: well seen depression or indentation in the initial early diastolic component of the Doppler waveform that indicates increased resistance to blood…
Normal Pelvic Anatomy as Depicted with Transvaginal Sonography
KEY TERMS Print Section Listen Key Terms Coronal: images obtained in the “elevational” plane. Curved (convex) array transducer: transducer elements arranged in curved fashion. Linear array: transducer elements linearly arranged….
