Many conversions to general anaesthesia follow an inadequate block that was not formally tested. Testing to cold and light touch, aiming for a sensory level of about T4 to T5, before the surgeon starts identifies a block that needs more time, a top-up or a different plan while there are still options.
Record the level and the modality tested. If the block is patchy, say so to the obstetric team before incision rather than after.
- Test the block bilaterally before incision and record the level and modality.
- Aim for a sensory block to about T4-T5 to cold or light touch.
- Tell the obstetric team if the block is not ready, before the knife is picked up.
- Have a clear plan for intraoperative discomfort, including when to convert.
Why it matters
A block found inadequate after incision leaves fewer and worse options.
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