Labor Analgesia — Epidural, CSE, DPE

Goal: minimize motor block while delivering good sensory analgesia.

T10 dermatomal level for first stage of labor (uterine contractions).

S2-S4 sacral coverage essential for second stage (vaginal distension).

Catheter threaded 3-5 cm into the epidural space — deeper than 5 cm increases unilateral block and false 'failed' epidural.

Test dose: 3 mL of 1.5% lidocaine + 15 mcg epinephrine — rules out intravascular (HR rise >20-30 bpm + transient HTN) and intrathecal (rapid-onset dense motor block bilaterally).

Always aspirate before each bolus.

The pressure of the bolus pushes LA through fascia and around nerves better than slow continuous infusion → more uniform dermatomal coverage, fewer breakthrough requests, lower total drug dose, less motor block.

Multiple randomized trials show superiority over continuous infusion.

Combine with PCEA (patient-controlled epidural analgesia): patient-triggered bolus 5-8 mL with 10-20 min lockout, max hourly dose limit.

PIEB + PCEA is the modern standard at most centers.

Continuous-only is obsolete.

Requires intrathecal opioid alone (CSE protocol) or very-dilute epidural to spare motor.

Many centers limit to bedside-supervised ambulation or restrict to early labor only.

CSE with sufentanil 5-10 mcg or fentanyl 25 mcg intrathecally enables 60-90 min of analgesia with preserved motor for early ambulation.

💉Benefits: rapid onset (intrathecal portion provides analgesia in 2-5 min) + extended coverage (epidural catheter for ongoing labor).

Used for advanced labor where fast analgesia matters, scheduled vs unscheduled cesareans, prolonged labor expected.

Cons: epidural catheter cannot be confirmed-working until needed (no test dose tolerable through fresh dural hole), small risk of CSF leak + PDPH through pencil-point dural puncture.

💉Performed identically to CSE up through advancing the spinal needle, but no medication is injected — the spinal needle creates a transdural pathway, then is withdrawn, and the epidural catheter is threaded.

Theory: a tiny dural hole allows epidural medication to translocate slowly into the CSF over time → faster onset + better sacral spread than plain epidural, but slower than CSE.

Lower PDPH risk than full CSE because no intrathecal drug + smaller cumulative cord disturbance.

Emerging as a middle-ground technique with good outcomes data; not yet universal.

One-sided block: turn patient to the NON-blocked side and rebolus (LA flows by gravity in the epidural space); if still unilateral, withdraw catheter 1-2 cm and rebolus.

Document every intervention with time.

Intravascular catheter (missed at test dose): tinnitus, peri-oral numbness, seizure, arrhythmia — STOP, lipid 20% bolus 1.5 mL/kg + infusion, ACLS modifications.

Intrathecal catheter (missed at test dose): dense motor block within minutes — recognize, treat as high/total spinal.

Failed regional → conversion to GA: full airway plan (RSI, position, predicted difficult intubation in OB).

Labor epidural does NOT prolong the first stage of labor (modern dilute mixtures, low motor block) and only modestly prolongs second stage (~15-20 min on average).

No significant effect on cesarean rate when comparing modern epidural mixes to no-epidural.

Opioids (fentanyl, sufentanil) at standard intrathecal/epidural doses do not cause clinically significant neonatal respiratory depression.

Time labor analgesia to the patient's request — earlier provision does not increase complications.

PDPH after accidental dural puncture (with 17-18G Tuohy): incidence up to 50%, present at 24-72 hr post-delivery — positional headache with neck stiffness, photophobia, tinnitus.

Treatment: conservative for 24-48 hr (caffeine, hydration, NSAIDs, supine positioning); if persistent → epidural blood patch (15-20 mL autologous blood).

New-onset back pain at the puncture site without other features is usually muscular and self-limited.

Document the follow-up and patient education on red flags.