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Multiple Pregnancy - Coggle Diagram

- - - - Pumps thick extra volume of blood
      - Leads to heart failure, generalised soft tissue swelling (hydrops), fetal death
    - - Risk of developing kidney failure due to inadequate blood flow
  - - - Stage I: DVP ≥8 cm in one sac
        DVP ≤ 2cm in the other sac
      - Stage II: Non-visualissation of fetal urinary bladder in donor over 60 min
      - Stage III: Doppler abnormalities (absent / reversed end diastolic flow in UA, Absent / reverse wave in DV, UV pulsations)
      - Stage IV: Hydrops in one or both twins
      - Stage V: Demise of one or both twins
- - - - Higher false +ve rates than in singleton pregnancy
      - Timing
        
        12-14 weeks
      - Normal
        
        3.5mm or less
  - - - Timing
        
        15-17 weeks
      - Risk of miscarriage
        
        0.5-1%
    - - Method
        
        Transcervical (TC)
        
        Transabdominal (TA)
      - Timing
        
        10-32 weeks TA
        10-11 weeks TC
      - Risk of miscarriage
        
        1-2% TA
- - - - Lamba sign
        
        Dichorionic twins
      - T sign
        
        Monochorionic