does anyone has any ideas on this?

in what way does a cervical plexus block (eg for carotis endarterectomy) influence the diaphragma movement?
is there a difference if you only perform a superficiel block compared to the combination on deep and suerficial?
is there a significant difference if you use higher concentrations of the local anesthetic?

a lot of questions, i think there must be even more different answers.

thank you!