dr. nabeel s. bondagji, md, frcsc department of obstetrics and gynecology feto-maternal unit
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DR. NABEEL S. BONDAGJI, MD, FRCSC
Department of Obstetrics and Gynecology
Feto-Maternal Unit
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PHYSIOLOGY OF AMNIOTIC FLUIDPHYSIOLOGY OF AMNIOTIC FLUID
Early pregnancy: composition of AF similar to ECF. Transfer of water across amnion and through fetal skin. By second trimester: fetus begins to urinate swallow, and inspire AF During
last 2/3 of pregnancy, AF is principally comprised of fetal urine.
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NORMAL AMNIOTIC FLUID VOLUMENORMAL AMNIOTIC FLUID VOLUME
Weeks Gestation
Fetus Amniotic Fluid Placenta (g) (ml) (g)
16 28 36 40
100 200 100 1000 1000 200 2500 900 400 3300 800 500
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DEFINITIONS: DEFINITIONS:
Polyhydramnios: 2000 cc amniotic fluid
Amniotic Fluid Index = largest vertical
pocket in 4 quadrants
polyhydramnios 24 cm.
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ETIOLOGY OF POLYHYDRAMNIOSETIOLOGY OF POLYHYDRAMNIOS
IdiopathicFetal AnomaliesDiabetesMultifetal gestationImmune/Non-immune hydropsFetal infectionPlacental haemangiomas
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Etiology of PolyhydramniosEtiology of Polyhydramnios: : Fetal AnomaliesFetal Anomalies
Problems with swallowing and GI absorption
Increased transudation of fluid:
anencephaly, spina bifidaIncreased urination: anencephaly (lack of
ADH, stimulation of urination centers)Decreased inspiration
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SYMPTOMSSYMPTOMS
Dyspnea Abdominal pain Venous stasis Contractions preterm labor Decreased Perception of Fetal
Movements
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DIAGNOSISDIAGNOSIS
Fundal height > gestational age Difficulty palpating fetal parts/hearing
heart tones Tense uterine wall ***Sonography
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(fetus)?(fetus)?
Fetal prognosis worsens with more severe hydramnios and congenital anomalies
15-20% fetal malformationsPreterm deliverySuspect diabetesProlapse of cord Abruption
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(Mother)?(Mother)?
DyspneaVenous Stasis Placental abruption Uterine dysfunction Post-partum hemorrhage Abnormal presentation -- C/S
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TREATMENTTREATMENT
Mild to Moderate hydramnios: rarely requires treatment
Hospitalization, bed restAmniocentesisNon-steroidal anti-inflammatory analgesiaBlood sugar control
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OLIGOHYDRAMNIOSOLIGOHYDRAMNIOS
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DEFINITION DEFINITION
AFI 5
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ETIOLOGY ETIOLOGY Postdate Fetal Anomalies: obstruction of fetal urinary tract/renal agenesis IUGR ROM Twin/Twin transfusion Exposure to ACE inhibitors, and Non-steroidal anti-inflammatory
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SIGNS/SYMPTOMSSIGNS/SYMPTOMS
Fundal height < gestational ageDecreased fetal movementFetal Heart Rate tracing abnormalityDiagnosis: Ultrasound
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Extremely poor fetal prognosis, especially in early pregnancy
Adhesions between amnion and fetal parts ---malformations and amputations
Musculoskeletal deformitiesPulmonary hypoplasia
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Cord Compression -- >fetal hypoxia
Passage of meconium into low AF volume: thick particulate suspension -->respiratory compromise
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TREATMENTTREATMENT
Delivery Amnioinfusion
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