Examination of the Female Pelvis Flashcards
Distance along the cavity from the sacral promontory to the tip of the sacrum
12 cm
Length of the sacral promontory to the tip of the sacrum
10 cm
Onset of pubic symphysis relaxation
first half of pregnancy
Peak of pubic symphysis relaxation
last 3 months
Ligaments comprising the arcuate ligament
superior and inferior pubic ligaments
By how much does the dorsal lithotomy position increase the pelvic diameter during labor?
1.5-2 cm
The name of the position used in aiding shoulder delivery
McRoberts Position
Name of the position to hasten the 2nd stage of labor by increasing the interspinous diameter and increasing the diameter of the pelvic outlet
Modified Squatting Position
Four planes of the pelvis
Superior Strait/ Inlet
Midpelvis
Outlet/ Inferior Strait
Plane of Greatest Pelvic Dimension
Normal value for the obstetric conjugate
10 cm
Normal value for diagonal conjugate
12 cm
Normal value for true conjugate
11 cm
Normal value for the transverse diameter
13.5 cm
Normal value for the oblique diameter
<13 cm
AP diameter at the level of the ischial spines
11.5 cm
Normal value for the post. sagittal diameter of the midpelvis
4 cm
Normal value for the AP diameter of the Outlet
11 cm
Normal value for the Intertuberous diameter of the outlet
11 cm
Normal value for the Post. Sagittal diameter of the outlet
7.5 cm
Thoms Rule
Post. Sagittal diameter + Transverse diameter > 15
When may the descent of fetal biparietal diameter/plane to the level below pelvic inlet occur in nulliparas?
During the last few weeks if pregnancy
Distance from plane of the pelvic inlet to the level of the ischial spines
approx. 5 cm
Distance of the biparietal plane of the unmolded fetal head to the vertex?
3-4 cm
What do you check for when estimating the mid-pelvis?
Prominence of ischial spines
Sidewalls (convergence)
Sacrum concavity (deep/shallow)
Sacrosciatic notch
normal value for bituberous outlet
8 cm or greater
Classification of pelvises based on greatest transverse diameter of inlet and its division into AP segments
Caldwell-Moloy
Segment defining the type of pelvis
post. segment
Segment defining the tendency of the pelvis
ant. segment
Kinds of tendencies of the pelvis
gynecoid, platypelloid, android, anthropoid
Most common type of pelvic tendency
gynecoid
Which pelvic tendency allows for fetal occiput to rotate anteriorly without difficulty?
gynecoid
Pelvic tendency allowing for fetal occiput to rotate away from symphysis
anthropoid
What position and configuration of the sacrum allows the head to traverse the entire pelvis in posterior position?
Post. at all levels
If the position and configuration of the sacrum is anterior, where will the fetal occiput rotate?
anterior
If the position and configuration of the sacrum is forward, where will the fetal occiput descend?
transverse position in descent
