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regional anaesthesia regional anesthesia ultrasound nerve block nerve blocks paravertebral block esp block amit pawa ultrasound guided regional anesthesia ultrasound guided regional anaesthesia breast blocks fascial plane blocks plan a blocks breast surgery erector spinae plane block pain continuous nerve block perineural catheters pecs block awake surgery anatomy serratus plane block mtp block rauk analgesia ra-uk rectus sheath block rectus sheath pvb fascia catheter acute pain nerve catheters brachial plexus breast sonoanatomy ergonomics needling neuman pawa asra2018 ga ra hip fracture infraclavicular block esra2018 raptir covid-19 covid19 pandemic planning ambulatory surgery surgery trunk blocks rcoa erector spinae plane rib fracture riss block epidural rib fracture pathways breast cancer paravertebral esp obesity raised bmi upper limb prescription local anesthetic local anaesthetic pump bolus infusion lloyd turbitt pro con debate healthcare nhs national health service asra 2019 las vegas anaesthesia anesthesia anaesthesiology anesthesiology risk benefit