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labor delivery ectopic pregnancy molar pregnancy miscarriages abruption previa Pas anatomy hypertensive. disorders during pregnancy detail information according to Williams obstetrics book

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All 10 topics covered. Here are a few high-yield clinical pearls to complement the detailed content above:

High-Yield Clinical Pearls

Labor
  • Active phase now defined as beginning at 6 cm (not 4 cm) per contemporary evidence — do not diagnose active-phase arrest before 6 cm
  • Prolonged latent phase is not an indication for cesarean section
  • Maternal obesity significantly slows labor — allow extra time before labeling dystocia
Ectopic Pregnancy
  • A single hCG level can never exclude ectopic; serial levels are essential
  • hCG discriminatory zone (1,500–2,000 IU/L): if above this and no IUP seen on TVS → high suspicion for ectopic
  • 20% of ectopic patients are hemodynamically unstable on presentation → don't delay surgical intervention
Molar Pregnancy
  • Preeclampsia before 24 weeks is virtually pathognomonic for molar pregnancy
  • Always avoid pregnancy for 1 year after complete mole to allow reliable hCG monitoring
Abruption vs. Previa
AbruptionPrevia
PainYes (uterine tenderness)No (painless)
Bleeding colorDarkBright red
Uterine toneRigid/hypertonicSoft
US diagnosisLow sensitivityHigh sensitivity
PAS
  • Risk of accreta with placenta previa + 3 prior cesareans = up to 61%
  • Attempting manual placental removal → catastrophic hemorrhage
  • Planned cesarean hysterectomy with placenta left in situ is the definitive treatment
Hypertensive Disorders
  • MgSO₄ prevents seizures in preeclampsia — it is not an antihypertensive
  • First sign of MgSO₄ toxicity: loss of deep tendon reflexes (at ~7–10 mg/dL)
  • Respiratory arrest at ~15 mg/dL; cardiac arrest at ~20 mg/dL
  • ACE inhibitors and ARBs are absolutely contraindicated in pregnancy
  • HELLP can present without severe HTN or proteinuria — always check LFTs and platelets in any pregnant patient with RUQ/epigastric pain
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