Nihon Sanka Fujinka Gakkai zasshi
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Nippon Sanka Fujinka Gakkai Zasshi · Jan 1980
[Clinical analysis of the pain pathways of labor (author's transl)].
Segmental epidural blocks by double catheters which were inserted in the thoracolumbar (Th12-L1) and lower lumbar region (L4-L5) were performed in eleven primiparas to investigate the correct pain pathways of labor and the sensory innervation of uterus. It is generally believed in Japan that the sensory nerves of the cervix of uterus enter the cord through the sacral segments (s2,3,4) and the uterine body through the thoracic segments (Th11, Th12). 5 ml dose of 0.5% bupivacaine (Marcaine) was used to the upper catheter (Th12-L1) during the first stage of labor. Segmental spread of analgesia was on average Th9.4-L1,6 and the duration was 1 hr 57 min +/- 34 min. ⋯ Th11. Th12. L1 segments and no relation to sacral nerves.