BACKGROUND AND OBJECTIVES: Interscalene brachial plexus block is associated with 100% incidence of @entity1269 as a result of @entity616 . We examined whether an ultrasound (US)-guided interscalene brachial plexus block performed at the level of root C7 versus a nerve stimulation interscalene brachial plexus block, both using 10 mL of @entity1342 0.75%, resulted in a lower incidence of @entity1269 . METHODS: In a prospective randomized controlled trial, 30 @entity1 scheduled for elective shoulder surgery under combined general anesthesia and interscalene brachial plexus block were included. Interscalene brachial plexus block using the same dose was performed using either US or nerve stimulation guidance of @entity1342 for both groups. General anesthesia was standardized. Ventilatory function was assessed using spirometry, and movement of the hemidiaphragm was assessed by US. RESULTS: Two @entity1 in the US group showed complete paresis of the hemidiaphragm, but in the nerve stimulation group, 12 @entity1 showed complete and 2 @entity1 had partial paresis of the hemidiaphragm (13% versus 93%, respectively; P < 0.0001). Ventilatory function (forced expiratory volume at 1 second, forced vital capacity, and peak expiratory flow) was significantly reduced in the nerve stimulation group compared with the US-guided group (P < 0.05). @entity616 occurred in the nerve stimulation group compared with none in the US group. No adverse effects occurred in either group. CONCLUSIONS: Ultrasound-guided interscalene brachial plexus block performed at the level of root C7 using 10 mL of @entity1342 0.75% reduces the incidence of @entity1269 .

Ultrasound-guided low-dose interscalene brachial plexus block reduces the incidence of XXXX .

@entity1269 :: ('MESH:D010291', 'Disease') :: ['hemidiaphragmatic paresis'] @entity1 :: ('9606', 'Species') :: ['patients'] @entity616 :: ('MESH:D006327', 'Disease') :: ['phrenic nerve block', 'One block failure'] @entity1342 :: ('MESH:C037663', 'Chemical') :: ['ropivacaine']
@entity1269 :: (MESH:D010291,Disease) :: ['hemidiaphragmatic paresis']
