Vertical Infraclavicular Block of the Brachial Plexus: Effects on Hemidiaphragmatic Movement and Ventilatory Function

The vertical infraclavicular block can result in a change in ipsilateral hemidiaphragmatic movement, with a decrease of ventilatory function. Although a correlation between the presence of Horner's syndrome and hemidiaphragmatic dysfunction was observed, hemidiaphragmatic dysfunction also occurred independently.