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Fetal PresentationAka: Fetal Attitude, Asynclitism

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  1. Presentation: Breech (Head is not presenting part)
    1. Occurs in 25% of pregnancies at 30 weeks
    2. Abnormal after 32 weeks
    3. See Fetal Malpresentation
  2. Presentation: Cephalic (Head is presenting part)
    1. Normal Presentation: Vertex
      1. Normal Attitude: Fetus is in full flexion
      2. Every fetal joint is flexed
      3. Smallest fetal head diameter: Suboccipitobregmatic
    2. Abnormal presentations: Extended Attitude
      1. General
        1. Abnormal Attitude: Fetal head is extended
        2. Results in largest head diameter: Occipitomental
        3. Increases diameter 3 cm (24%) over flexed head
        4. May results in Failure to Progress
      2. Face Presentation
      3. Brow Presentation
      4. Shoulder Presentation
    3. Abnormal Presentation: Asynclitism
      1. Definition
        1. Lateral flexion of head
        2. Sagittal Suture not in midline of vaginal canal
      2. Interpretation
        1. Mild asynclitism is normal
        2. Extreme asynclitism interferes with delivery
          1. May result in Failure to Progress
          2. Interferes with forceps application

Labor Presentation (C0022869)

Definition (MSH)The position or orientation of the FETUS at near term or during OBSTETRIC LABOR, determined by its relation to the SPINE of the mother and the birth canal. The normal position is a vertical, cephalic presentation with the fetal vertex flexed on the NECK.
ConceptsClinical Attribute (T201)
MSHD007746
EnglishFetal Presentation, Fetal presentation -RETIRED-, Labor Presentation, Presentation of fetus
Spanishpresentacion del feto, presentacion fetal, presentacion fetal - RETIRADO -
Parent ConceptsPregnancy (C0032961), Ambiguous concept (C1274012), Duplicate concept (C1274013), Arrangement of fetus (C1286296)
SourcesLNC, MSH, SCTSPA, SNOMEDCT
Derived from the NIH UMLS (Unified Medical Language System)


Asynclitism (C0233304)

ConceptsFinding (T033)
EnglishAsynclitism, Parietal presentation
Spanishasinclitismo, presentacion parietal
Parent ConceptsFetal Malpresentation (C0233256), Finding of position of vertex presentation (C0566797)
SourcesSCTSPA, SNOMEDCT
Derived from the NIH UMLS (Unified Medical Language System)



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