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Engagement –
when largest diameter of presenting part reaches or passes through pelvic
inlet.
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Figure 15-7, p 314
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The biparietal diameter
(BPD) of fetal head settles into inlet of pelvis. In most instances, the
occiput is at the level of the ishial spines () station.
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Station
–refers to the relationshio of presenting part to an imaginary line drawn
between the ischial spines of the maternal pelvis. If the presenting part is
higher than the ischial spines, the station has a negative #, referring to centimeters above 0
station..Minus 5 is at the pelvic inlet.
Positive #s = presenting part has passed the ischial spines. Positive
(+) 4 is at the outlet.
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See Figure 15-8, p 315
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Fetal position
– relationship of the designated landmark of
fetal presenting part to the left or right side of the maternal
pelvis. The designated landmarks are vertex: the occiput; in face presentation: the mentum. In
breech: the sacrum; for shoulder: the acromion process of the scapula. If
directed to side, it is designated as transverse.
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The landmark on the fetal
presenting part r/t four imaginary
quadrants: left anterior, right anterior, left posterior, and right
posterior, meaning: Is the presenting part directed toward the front, back,
left or right of the passage?
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Three notations:
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1.Right ® or left (L) side of maternal pelvis
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2.The landmark of fetal presenting part: occiput (O); mentum (M), sacrum
(S), or acromion process (A).
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3.Anterior (A), posterior (P), or transverse (T )
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4. Figure 15-9 p 316.
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Click back to slide 7
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