Obstetrics Book

Fetal Disorders

Labor Induction

Miscellaneous

Natural Childbirth

Stage

Uterine Disorders

Examination Chapter related topics

Fetal Disorders Chapter related topics

Hemorrhage Chapter related topics

Infectious Disease Chapter related topics

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Brow Presentation

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  1. Definition
    1. Head hyperextended, with brow as presenting part
  2. Pathophysiology
    1. Normal Attitude: Fetus is in full flexion
      1. Smallest fetal head diameter: Suboccipitobregmatic
    2. Brow presentation is an extended attitude
      1. Results in largest head diameter: Occipitomental
      2. Increases diameter 3 cm (24%) over flexed head
      3. May results in Failure to Progress
  3. Epidemiology
    1. Incidence: 0.02% of singleton deliveries
  4. Causes
    1. Similar to Face Presentation
  5. Signs
    1. Digital cervical exam
      1. Forehead features palpable (anterior Fontanel, nose)
  6. Management
    1. Ceserean section required in most cases
    2. Brow presentation rarely can deliver vaginally unless:
      1. Spontaneously converts to vertex or Face Presentation
      2. Fetus is very small or pelvis is very large
    3. Do not attempt to convert brow presentation to vertex
    4. Never apply vacuum extractor to brow presentation
    5. Do not apply internal scalp electrodes
    6. Avoid Oxytocin

Brow presentation NOS (C0233276)

ConceptsFinding (T033)
EnglishBrow presentation
Spanishpresentacion cefalica de bregma
Parent ConceptsFetal Malpresentation (C0233256), Brow presentation NOS (C0233276), Ambiguous concept (C1274012)
SourcesSCTSPA, SNOMEDCT
Derived from the NIH UMLS (Unified Medical Language System)



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