Local anesthesia comparison for Caesarean section

Spinal VS epi 

Spinal versus epidural anaesthesia for caesarean section.

http://www.ncbi.nlm.nih.gov/pubmed/15106218

Spinnal + epi  VS epi

Combined spinal-epidural versus epidural analgesia in labour.http://www.ncbi.nlm.nih.gov/pubmed/14583973
http://www.ncbi.nlm.nih.gov/pubmed/23076897