OBSadvanced
Explain how moulding and descent findings can contribute to identifying possible cephalopelvic disproportion.
Answer
Moulding helps assess how well the pelvis accommodates the fetal head. Increasing moulding while the head remains high is an ominous sign of possible cephalopelvic disproportion. Descent is assessed abdominally using the rule of fifths; 2/5 or less palpable above the symphysis pubis indicates engagement in the supplied material.
Explanation
Moulding reflects adaptation of the fetal skull during passage through the pelvis. The slides warn that increasing moulding with a high head is concerning for cephalopelvic disproportion. Descent adds a separate progress measure: the rule of fifths estimates how much head remains palpable above the symphysis pubis, and 2/5 or less indicates engagement in this teaching material. **Key takeaway:** Interpret moulding together with the level and descent of the head.\n\n**Glossary:** **Cephalopelvic disproportion**: mismatch between fetal head and maternal pelvis; **engagement**: passage of the presenting diameter below the inlet.
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