Relation between fetus & pelvis

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Relation between fetus & pelvis

  1. 1. RELATION BETWEENFETUS & PELVIS
  2. 2.  LIE PRESENTATION PRESENTING PARTS ATTITUDE DENOMINATOR POSITION CEPHALIC PROMINENCE
  3. 3.  LIE The relationship b/w the long axis of fetal ovoid to the long axis of uterine ovoid LONGITUDINAL LIE TRANSVERSE LIE OBLIQUE LIE
  4. 4.  PRESENTATION That part of the fetus that lies over the pelvic inlet & occupies the lower poles of the uterus 3 presentation CEPHALIC PODALIC/BREECH SHOULDER
  5. 5.  PRESENTING PARTS The most dependant part of the fetus, which is felt first on vaginal examinationIn cephalic presentation depending upon degree of flexion, vertex brow face deflexed head
  6. 6.  In breech presentation Flexed breech (fetal legs may be flexed) Extended breech (extended at knees) Footling breech (completely extended)
  7. 7.  ATTITUDE The relation of fetal parts to each other Main attitudes FLEXION EXTENSION
  8. 8.  TYPICAL FETAL ATTITUDE universal flexion with head flexed over chest, arms & legs flexed in front of the body and back curved forward
  9. 9. Anteroposterior diameters of the fetal skullAP diameter Attitude Presenting partSuboccipitobregmatic 9.4 Complete flexion Vertex occipitoanteriorcmSuboccipitofrontal 10.5 Incomplete flexion Vertexcm occipitoposteriorOccipitofrontal 11 cm Deflexion Vertex occipitoposteriorVerticomental 13.5 cm Extension BrowSubmentobregmatic 9.4 Complete extension facecm
  10. 10.  DENOMINATOR An arbitrarily chosen point on the presenting part of the fetus which is used to describe the position.
  11. 11. Presentations of the fetusPresentation Attitude DenominatorCephalic vertex occipitoanterior Flexion Occiput vertex occipitoposterior Deflexion occiput brow Extension brow face Complete extension Chin or mentumPodalic or breech sacrumshoulder acromion
  12. 12. Frequency of lie andpresenting partLie Presentation and presenting partLongitudinal 99.5% Vertex 96%Transverse or oblique 0.5% Face 0.5% Brow 0.5% Breech 3% Shoulder 0.5%
  13. 13.  POSITION The relationship of the denominator to the four quardrants of the maternal pelvis.
  14. 14.  In vertex presentation Left occipitoanterior(common) Left occipitotransverse Left occipitoposterior Right occipitoanterior Right occipitotransverse Right occipitoposterior
  15. 15. Occipitoanterior
  16. 16. Left occipitoposterior
  17. 17. LeftOccipitoanterior
  18. 18. LeftOccipitotransverse
  19. 19. Occipitoposterior
  20. 20.  CEPHALIC PROMINENCE The most prominent part of the head palpable per abdomen Produced by flexion and extension of the head Vertex presentation (head well flexed) occiput is lower than sinciput (can be felt on the side opposite to the back)
  21. 21.  When the presenting part is face or brow (extension of head) sinciput is lower than occiput (can be felt on the same side of the back) Cephalic prominence can be palpated by the second pelvic grip
  22. 22.  When no cephalic prominence is felt, there is neither flexion nor extension and the attitude is one of deflexion . This is also called military position
  23. 23.  Longitudinal lie commoner –fetus being an ovoid accommodates itself easily along the long axis of the uterine ovoid Cephalic presentation commoner -the head being heavier and more compact , due to gravitation, comes to occupy lower pole and bulkier breech adapts to the fundus of uterus ,which is roomier
  24. 24.  MOULDING Cranial bones are connected by membrane and this allows considerable shifting or sliding of each bone to accommodate to the maternal pelvis. Frontal and occipital bone pass under parietal bone. Posterior parietal is subject to more pressure by the sacral promontory , it passes under anterior parietal.
  25. 25. MOULDING (conti…..)Thus there is compression of the presenting diameter with compensatory bulging of the diameter at right anglesEg: in occipitoanterior head is compressed in the presenting suboccipitobregmatic and elongated in the verticomental diameter .
  26. 26.  Moulding is assessed on vaginal examination at two sites parietal-parietal parietal-occipital• disappears a few hrs after birth• Protective mechanism & prevents the fetal brain from compression as long as it is not excessive or not rapid
  27. 27.  GRADING Grade 1 / +moulding :obliteration of suture line Grade 2 / ++moulding : reducible overlap Grade 3 /+++moulding:irreducible overlap (pathological )
  28. 28.  Clinical significance Some amount of moulding is beneficial and this is one of the factors which decide the success of a trial of labour Severe moulding can lead to intracranial haemorrhage The site of moulding gives information about the position of the head
  29. 29. Thank you

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