Epidural catheter blockage caused by a blood clot: is it time to change our practice?

A 36-year-old parturient (height, 153 cm; weight, 80 kg; body mass index, 34.2) requested epidural analgesia to relieve her labor pain in the early labor stage. An epidural block was performed on the patient in the lateral position with an 18-G Tuohy needle in the L4–5 interspace under strict aseptic technique, which failed because of technical difficulty. Several attempts were then made to administer the epidural block in the L3–4 interspace that was identified using the loss-of-resistance-to-air technique.

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