Intermediate
Technical
In the Industry Vocabulary Test
cephalopelvic disproportion
A condition where the fetal head is too large or the maternal pelvis too small for safe vaginal delivery.
Full Definition
Cephalopelvic disproportion (CPD) occurs when there is a mismatch between the size of the fetal head and the maternal pelvis, preventing safe vaginal delivery. This condition may be due to fetal macrosomia, abnormal fetal presentation, or maternal pelvic abnormalities. CPD can be diagnosed during labor when normal progress fails despite adequate contractions, or may be suspected antenatally based on clinical pelvimetry and estimated fetal weight. The condition often necessitates cesarean delivery to prevent maternal and fetal complications.
Usage
Usage note: Hyphenate when used as compound modifier. CPD abbreviation acceptable after first use.
In Context
- "Cephalopelvic disproportion was diagnosed after arrest of descent at +1 station." — Operative delivery note
- "Clinical pelvimetry suggested possible cephalopelvic disproportion with estimated fetal weight of 4200g." — Antenatal consultation
Also known as
CPD
fetopelvic disproportion
Contrasted with
adequate pelvis
Don't confuse with
failure to progress
fetal malposition