We present a case of unexpectedly prolonged motor and sensory block following a successful single injection ultrasound - guided infraclavicular block with bupivacaine (0.25%) and dexamethasone (8 mg). ultrasound guidance and safety measurement such as injection of the local anaesthetic at a slow rate and verifying that usual resistance was felt throughout the injection, has been applied. It took 42 hours for the block to go away. Although there was no evidence of neurologic injury but we should always be prepared to consider the possibility of nerve injury and take appropriate measures.
Keywords: Dexamethasone; Nerve Block.