Normal Labor and Birth Kim Ploch, mn, cnm, arnp


Physiology of Labor Intra-abdominal pressure – abd muscles tighten with ctx to expel fetus & placenta



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Physiology of Labor

  • Intra-abdominal pressure – abd muscles tighten with ctx to expel fetus & placenta

  • Changes in pelvic floor musculature – perineum thins from 5 cm to < 1 cm, pelvic floor muscles draw up rectum and vagina following pelvic curve, creates a natural anesthesia

Premonitory Signs of Labor

  • “Lightening”

  • Braxton-Hicks contractions

  • Cervical changes – “ripening”

  • Bloody show, loss of mucus plug

  • Rupture of membranes (ROM)

occurs in 12% of all births

80% deliver within 24 hrs

True vs False Labor

True Labor




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