Assessment of the Sympathetic Nervous System Blockade of the Upper Limb After a Brachial Plexus Block in Patients With End Stage Renal Failure
The purpose of this study is to investigate what effect a local anesthetic nerve block of the arm in patients with end stage renal failure has upon blood flow in the skin of the arm.
|Study Design:||Observational Model: Cohort
Time Perspective: Prospective
|Official Title:||Assessment of the Sympathetic Nervous System Blockade of the Upper Limb After a Brachial Plexus Block in Patients With End Stage Renal Failure|
|Study Start Date:||February 2010|
|Estimated Study Completion Date:||December 2012|
|Estimated Primary Completion Date:||December 2012 (Final data collection date for primary outcome measure)|
|Arterio-venous fistulae creation|
To quantify the degree of sympathetic blockade in the upper limb in patients with end stage renal failure produced during a regional anaesthetic technique, using laser Doppler flowmetry.
Regional anaesthesia of the upper limb results in blockade of motor and sensory nerves, providing surgical and post-operative analgesia. Sympathetic nerves are also blocked resulting in local vasodilatation. This may be of benefit in surgery where enhanced blood flow is beneficial such as arterio-venous fistula creation. The degree and duration of sympathetic blockade produced by regional blocks however, has never been quantified. This study aims to quantify sympathetic blockade by measuring the changes in skin blood flow and skin temperature after placement of a brachial plexus block.