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Anaesthesia
A 25 year old male with roadside accident underwent debridement and reduction of fractured both bones right forearm under axillary block. On the second postoperative day the patient complained of persistent numbness and paresthesia in the right forearm and the hand. The commonest cause of this neurological dysfunction could be all of the following except :
Crush injury to the hand and lacerated nerves
A tight cast or dressing
Systemic toxicity of local anaesthetics
Tourniquet pressure
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