Phrenic nerve block caused by interscalene brachial plexus b
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Abstract
Background
Interscalene brachial plexus (ISB) block is often associated with phrenic nerve block and diaphragmatic paresis. The goal of our study was to test if the anterior or the posterior ultrasound guided approach of the ISB is associated with a lower incidence of phrenic nerve blocks and impaired lung function.

Methods
This was a prospective, randomized and single-blinded study of 84 patients scheduled for elective shoulder surgery who fullfilled the inclusion and exclusion critereria. Patients were randomized in two groups to receive either the anterior or the posterior approach for ISB. Clinical data were recorded. In both groups patients received ISB with a total injection volume of 15 ml of ropivacaine 1 percent. Spirometry was conducted at baseline and 30 min after accomplishing the block.....

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4966700/
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