The chance of the baby surviving is as high as 70%.[3] The procedure is rarely done as cardiac arrest only occurs in about 1 in 30,000 pregnancies.[4] It may be performed by an obstetrician, emergency physician, or surgeon.[5][6] While the procedure has been described for 1,000s of years, documented cases of babies surviving began to occur in the late 1800s and mother surviving in the late 1900s.[7]