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  |<center>'''Class 4'''</center>  

  |<center>'''Class 4'''</center>  

  |lso known as the caval syndrome, is characterized by sudden onset with collapse, hemoglobinuria, and respiratory distress. If surgery is not immediately instituted, this syndrome is usually fatal.

  |Caval syndrome: sudden onset of collapse, haemoglobinuria, and respiratory distress. Usually fatal without immediate surgery.

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  |}

  |}