We studied the epidural cephalad and caudad spread of 2% chloroprocaine buffered with sodium bicarbonate administered epidurally at the beginning of the second stage of labor.

• 我们对产妇在第二产程一开始时即对经用碳酸氢钠2%25氯普鲁卡因在硬膜外的头向的扩散情况进行了研究。