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68848 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 :

ACrush injury to the hand and lacerated nerves
BA tight cast or dressing
CSystemic toxicity of local anaesthetics
DTourniquet pressure
Anaesthesia
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