[1]Department of Gynecology and Obstetrics;
Ankang People''s Hospital in Shaanxi Province;
Ankang City;
Shaanxi Province;
725000;
[1]Department of Gynecology and Obstetrics;
Ankang People''s Hospital in Shaanxi Province;
Ankang City;
Shaanxi Province;
725000;
[2]Anesthesiology Department;
Ankang People''s Hospital in Shaanxi Province;
Ankang City;
Shaanxi Province;
725000;
Epidural labor analgesia; Ropivacaine; Sufentanil; Pain mediator; Stress response;