Objective Analysis antepartum forecase and intrapartum treatment to shoulder dystoc-ia,in order to decrease the complication of maternity and neonatal caused by shoulder dystocia.

Along with development of ultrasonic technology and improved interventional instruments, together with more appropriate criteria of candidate selection, optimized treatment protocols and thorough understanding of anatomy and function of fetal heart, prenatal intervention to fetal congenital cardiovascular malformation will be evolving to a new stage.

Borehole stability prediction before drilling for formations under the second section in an exploration well;