Gimovsky AC, Pham A, Ahmadzia HK, Sparks AD, Petersen SM. Risks associated with cesarean delivery during prolonged second stage of labor. American journal of obstetrics & gynecology MFM. 2021 Dec;3(3). 100276 p. PMID: 33451607 [PubMed]
Data regarding maternal and fetal morbidities are limited to surgical morbidity per each additional hour in the second stage of labor.