Combined Spinal–Epidural

Definition & Technique

Combined spinal–epidural (CSE) anaesthesia combines a single-shot spinal with the placement of an epidural catheter in one procedure — classically by a needle-through-needle technique (the spinal needle passed through the epidural needle to reach the CSF, then the epidural catheter sited).

Advantages & Uses

CSE gives the rapid, dense, reliable onset of the spinal together with the flexibility of the epidural catheter to prolong the block and provide postoperative analgesia. It is popular in obstetrics (labour and caesarean) and for major lower-limb and abdominal surgery, offering the best of both techniques.

WHY Combine Them

The rationale for combining the two techniques is that each compensates for the other’s main weakness: the single-shot spinal gives a fast, dense and reliable block but is of fixed and limited duration, while the epidural catheter is slower and sometimes patchy in onset but can be topped up indefinitely, so together they provide rapid surgical anaesthesia that can be extended for a long operation and continued for postoperative pain relief. In labour, a low-dose spinal component gives rapid analgesia while the catheter allows the block to be maintained and adjusted through a labour of unpredictable length and converted to surgical anaesthesia if a caesarean becomes necessary.

In Brief

In short, one puncture yields both a working spinal and a catheter for whatever the operation or labour goes on to require.

Combines rapid spinal onset with epidural extendability.

• CSE: single-shot spinal + epidural catheter (often needle-through-needle) in one procedure.
• Combines rapid dense spinal onset with epidural catheter flexibility.
• Prolongs the block & provides postoperative analgesia.
• Popular in obstetrics & major lower-limb/abdominal surgery.