APH (Antepartum Haemorrhage) and Placenta previa (PP) Diagnosis Symptoms

APH (Antepartum Haemorrhage) and Placenta previa (PP) Diagnosis Symptoms

APH (Antepartum Haemorrhage) and Placenta previa (PP)

APH (Antepartum Haemorrhage)

  • } It is defined as bleeding from or into the Genital tract.

APH (Antepartum haemorrhage)


Cause of APH

} I. Placenta previa (PP) is defined as the presence of placental tissue over or near the internal cervical os.

} PP can be classified into four types based on the location of the placenta relative to the cervical os: to the internal os.

Placenta previa (PP)

Placenta previa (PP)

  • } Type-1/low-lying placenta,
    • ◦ placenta is located near (2 to 3 cm) but not directly adjacent
  • } Type-2/marginal previa,
    • ◦ the edge of the placenta lies adjacent to the internal os;
  • } Type-3/partial previa,
    • ◦ the margin of the placenta covers part but not all of the internal os;
  • } Type-4/complete or total previa,
    • ◦ the placenta covers the entire cervical os;
  • } 1. the incidence of PP is 1 in 200 to 1 in 390 pregnancies over 20 weeks’ gestational age).
    • ◦ varies with parity,
    • ◦ For nulliparous, the incidence is 0.2%, in grand multiparous, it may be as high as 5%
  • } 2.  The most important risk factor for PP is a previous cesarean section.
    • ◦ PP occurs in 1% of pregnancies after a cesarean section.
    • ◦ The incidence after four or more cs increases to 10%

APH Epidemiology

  • ◦ increasing maternal age after age 40),
  • ◦ multiple gestation, and previous uterine curettage
  • ◦ the placenta covers the cervical os in 5% of pregnancies when examined at midpregnancy.
  • ◦ The majority resolve as the uterus grows with gestational age.
  • ◦ The upper third of the cervix develops into the lower uterine segment, and the placenta “migrates” away from the internal os.
Other risk factors
  • } Unknown –
    • ◦ a.  Endometrial scarring.
    • ◦ b.  A reduction in uteroplacental oxygen promotes need for an increase in the placental surface area that favors previa formation.

APH Etiology

  • } Bleeding occur in association with the development of the lower uterine segment in the third trimester.
  • } Placental attachment is disrupted because this area gradually thins in preparation for labor.
  • } the thinned lower uterine segment is

Cause of bleeding

  • } unable to contract adequately to
  • } prevent blood flow from the open vessels.shearing action
  • } Vaginal examinationHow to take good medical history & examination. Read more ... » or intercourse may also cause separation of the placenta from the uterine wall.
  • } 80% of affected patients present with painless vaginal bleeding
  • } Most commonly, the first episode is around 34 weeks of gestation;
  • } one-third of patients develop bleeding before 30 weeks
  • } Anaemia

Clinical Manifestations symptoms –

APH Diagnosis

  • } Vaginal sonography –
    • ◦ is the gold standard for diagnosis of previa
    • ◦ Placental tissue has to be overlying or within 2 cm of the internal cervical os to make the diagnosis.
    • ◦ The diagnosis may be missed by transabdominal scan,
    • ◦ if the placenta lies in the posterior portion empty bladder may help in identifying anterior previas, and Trendelenburg positioning may be useful in diagnosing posterior previas.

Complete placenta previa. Sagittal mid-line view of the lower uterus performed tau the placenta (PL) completely covering the cx

Marginal/partial placenta previa in 3RD trimester patient with bleeding. Tvu shows inferior edge of posterior pl (P) located at internal CX os

APH (Antepartum Haemorrhage)

Examination.

  • } 4. . The following laboratory studies should be done for a patient with PP with vaginal bleeding:
    • ◦ a.  Complete blood cell count
    • ◦ b.  Type and cross-match
    • ◦ c.  Prothrombin time and activated thromboplastin time
    • ◦ d.  Kleihauer test to assess for fetomaternal hemorrhage

Laboratory Studies

Complications

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