chapter 8 clinical assessment and sonographic procedures Flashcards
The sonographer should determine
- parity, including spontaneous and therapeutic terminations
- whether prior pregnancies were full-term or preterm deliveries.
Positions that can be used during the obstetric ultrasound examination include:
supine, lateral decubitus , erect position.
Scanning planes
the longitudinal, Transverse, coronal, oblique planes.
the sonographer’s have to evaluate:
The uterus, Adnexa, Fetus, Amniotic fluid, Placenta
The first trimester ultrasound examination can be performed either:
transabdominally (TA) or transvaginal (TV).
If the initial approach (either transabdominal or transvaginal) is not definitive, then which alternative approach should be tried.
Transvaginal sonography
At the present time, sonographers can become credentialed by two organizations:
The Fetal Medicine Foundation/USA (FMF/USA)
and
Nuchal Translucency Quality Review Program (NTQR).
Fetus in Midsagittal Plane
image is magnified to include only fetal head and upper portion of thorax.
All second and third trimester obstetric ultrasound examinations should begin with an initial survey performed in a
transverse scanning plane.
The following anatomic structures should be evaluated
head and neck, spine, abdomen and pelvis, thorax and extremities.
Amniocentesis is the most
common invasive obstetric procedure
CVS (choroid villus sampling)
allows diagnosis in the first trimester and usually is performed after 9 to 10 weeks gestational age.
percutaneous umbilical blood sampling(PUBS):
evaluation of many fetal hematologic abnormalities.