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STELLATE GANGLION BLOCK ANAESTHESIA TUTORIAL OF THE WEEK 256

INTRODUCTION The sympathetic nervous system (SNS) directly controls involuntary human homeostatic activities and has a major role in neuropathic, vascular, and visceral pain. Sympathetically maintained pain occurs in a variety of vascular pathologies such as occlusive arterial diseases, diabetes mellitus or venous ulceration and neuropathic conditions such as complex regional pain syndrome (CRPS), postherpetic neuralgia and after peripheral nerve lesion. CRPS type I (formerly known as reflex sympathetic dystrophy) occurs following an initiating event such as trauma or injury but with little or no nerve injury while CRPS Type II (formerly causalgia) has nerve injury as its causative factor.