NCT00370604.

Trial name or title	'Effect of small versus large epidural needles on postdural puncture headache study'
Methods	Allocation: randomized Endpoint classification: safety/efficacy study Intervention model: parallel assignment Masking: single‐blind (outcomes assessor) Primary purpose: prevention
Participants	Inclusion criteria: ‐ American Society of Anesthesiologists status 1 to 2 ‐ Must have provided written informed consent = or < 6 cm cervical dilation ‐ Fetus 37 to 42 weeks gestation ‐ Must be able to read and write English well enough to provide written informed consent Exclusion criteria: ‐ BMI = or > 40 ‐ Multiple gestation pregnancy ‐ Known contraindications to use of epidural analgesia ‐ Pregnancy‐induced hypertension ‐ Investigator concern for maternal or neonatal welfare ‐ Receipt of spinal or epidural anaesthesia within 14 days of labour epidural request ‐ Women with chronic headaches (defined as headaches that occur 15 or more days per month for more than 3 months) ‐ Already participated in study ‐ History of narcotic abuse Age minimum: 18 years Age maximum: N/A Gender: female
Interventions	Device: => 18 G Tuohy‐type needle Device: 19 G Tuohy‐type epidural needle, 23 G catheter
Outcomes	Incidence of post‐dural puncture headache (time frame: within the first 14 days of epidural placement) Anaesthesiologist satisfaction with the 19 G Tuohy epidural needle and 23 G catheter compared with traditional Tuohy‐type epidural needles and traditional catheters (time frame: during labour and delivery) Degree of dysfunction and disability related to PDPH symptoms (time frame: within first 14 days post‐epidural placement and, if necessary, up to 1 year post‐epidural placement)
Starting date	June 2007
Contact information	Pamela J Angle
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