Along these lines, recent observations in animals indicate that chronic sympathectomy eliminates endothelial NO synthase expression
in sympathectomised blood vessels (Aliev et al. 1996). This suggests that normal NO-mediated responses to local and circulating factors would be present
following acute sympathectomy with local anaesthetics or drugs injected into the brachial artery, but that these responses would be absent in the months and
years following surgical sympathectomy.
http://jp.physoc.org/cgi/content/full/526/3/471