17 - PLACENTA PREVIA Lin Qi De Definition Placenta previa:...

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Unformatted text preview: PLACENTA PREVIA Lin Qi De Definition Placenta previa: Abnormal location of the placenta over ,or in close proximity to the internal os. Incidence: approximately 1 /250 pregnancy nulliparas: 1/1000~1/1500 pregnancy grandmultiparas: 1/20 Classification Complete (total) placenta previa: entire cervical os is covered Partial placenta previa: the margin of the placenta extends across but not all of the internal os. Marginal: edge of the placenta lies adjacent to the internal os Low lying placenta: placenta is located near but not directly adjacent to the internal os. Etiology Mechanism: abnormal vascularization Predisposing factors: Twin pregnancy Increasing maternal age Increasing parity Previous cesarean section diagnosis Painless vaginal bleed: first bleeding episode is 29~30 weeks Ultrasonography: benefit in localizing the placenta and diagnosis placenta previa Caution...
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17 - PLACENTA PREVIA Lin Qi De Definition Placenta previa:...

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