Author: Ahmed Samir Saad, MD, et al.
Revista Chilena de Anestesia. 2025;54(3):281–287.
Dural puncture epidural analgesia using either a 25-gauge or 27-gauge Whitacre spinal needle produced faster and more effective early labor analgesia than conventional epidural analgesia. Because the two needle sizes provided nearly identical analgesic benefits, the investigators favored the smaller 27-gauge needle because it was associated with fewer post-dural puncture headaches.
Study Design
This randomized, single-center trial enrolled 81 healthy primigravida patients with ASA physical status II who were in active labor. Seventy-eight patients were included in the final analysis and assigned to one of three groups:
- Conventional epidural analgesia
- Dural puncture epidural using a 25-gauge Whitacre needle
- Dural puncture epidural using a 27-gauge Whitacre needle
No medication was administered intrathecally in either dural puncture epidural group. All patients received the same epidural bolus and continuous infusion containing bupivacaine and fentanyl.
The primary outcome was the time required to achieve adequate analgesia, defined as a visual analog pain score below 3.
Key Findings
Both dural puncture epidural techniques produced significantly faster analgesia than conventional epidural analgesia.
The average time to adequate analgesia was:
- Conventional epidural: 14.69 minutes
- 25-gauge dural puncture epidural: 9.81 minutes
- 27-gauge dural puncture epidural: 9.80 minutes
There was no meaningful difference in onset time between the 25-gauge and 27-gauge needles.
Pain scores at 10 and 15 minutes were significantly lower in both dural puncture epidural groups compared with the conventional epidural group. However, pain scores became similar among the groups later during labor.
The dural puncture epidural technique also improved sacral spread without producing a clinically significant increase in motor blockade or hemodynamic instability.
Complications
Rates of hypotension, nausea, pruritus, bradycardia, vomiting, and motor blockade were low and generally similar among the groups.
Post-dural puncture headache occurred in:
- Conventional epidural: 0 patients
- 25-gauge dural puncture epidural: 6 patients, or 22.2%
- 27-gauge dural puncture epidural: 3 patients, or 12%
Although the overall comparison did not reach statistical significance, the incidence was numerically lower with the 27-gauge needle. The authors also reported a statistically significant difference between the conventional epidural and 25-gauge groups in a separate comparison.
Clinical Implications
Dural puncture epidural analgesia may provide a useful middle ground between conventional epidural and combined spinal-epidural techniques. It offers faster analgesia and improved sacral coverage without requiring the intrathecal administration of local anesthetics or opioids.
Because the 25-gauge and 27-gauge needles produced essentially identical analgesic results, the authors recommended the 27-gauge Whitacre needle. Its smaller dural puncture may reduce the risk of post-dural puncture headache while preserving the clinical advantages of the technique.
Limitations
The study was limited by its small sample size, single-center design, and inclusion of only healthy primigravida patients. The relatively high incidence of post-dural puncture headache, particularly in the 25-gauge group, should be interpreted cautiously and evaluated in larger trials.
Conclusion
Dural puncture epidural analgesia using either a 25-gauge or 27-gauge Whitacre needle accelerated the onset of labor analgesia and improved early pain control compared with conventional epidural analgesia.
Since both needle sizes were equally effective, the 27-gauge needle appears preferable because it may provide the same analgesic benefit with a lower risk of post-dural puncture headache.
We thank the Revista Chilena de Anestesia for allowing us to summarize this important clinical research.