Take the claim that epidurals impede a woman?s ability to push. Before the mid-1990s, this was almost certainly true. But back then, epidurals were different. They contained a concentration of 0.25 percent local anesthetic, which blocks the channels on nerve membranes that are necessary for propagating pain signals to the brain. At high enough concentrations, anesthetics can also affect motor neurons, preventing communication between muscles and the brain and making it difficult for women to push. Today, epidurals provide a quarter to half that concentration of local anesthetic, plus a very low dose of narcotics?which have no effect on motor neurons?to take the edge off. In a double-blinded study published in 2001, researchers gave women in early labor a dose of narcotics through an epidural catheter and then split them into two groups, providing half with the current epidural regimen and the other half with no additional pain medication. The women who had the epidurals were equally as able to lift their knees, wiggle their toes, and walk as those who had no additional meds.
Source: http://feeds.slate.com/click.phdo?i=303d31a51109a18194d1b205a3f65dd9
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