Comparative Study

Comparison of thoracic epidural pressure in the sitting and lateral decubitus positions.

Anesthesiology. 2008 Jul 1;109(1):67-71.
Randomized Controlled Trial

The influence of neck flexion and extension on the distribution of contrast medium in the high thoracic epidural space.

Anesth. Analg. 2007 Jun 1;104(6):1583-6, table of contents.
Randomized Controlled Trial

Influence of posture on the incidence of vein cannulation during epidural catheter placement.

Eur J Anaesthesiol. 2005 Feb 1;22(2):103-6.