Randomized Controlled Trial

Predistention of the epidural space before catheter insertion reduces the incidence of intravascular epidural catheter insertion.

Anesth. Analg. 2007 Aug 1;105(2):460-4.
Randomized Controlled Trial

Dural puncture with a 27-gauge Whitacre needle as part of a combined spinal-epidural technique does not improve labor epidural catheter function.

Anesthesiology. 2005 Nov 1;103(5):1046-51.
Randomized Controlled Trial

Comparison of the effects of thoracic and lumbar epidural anaesthesia on induction and maintenance doses of propofol during total i.v. anaesthesia.

Br J Anaesth. 2008 Aug 1;101(2):255-60.