sympathetic nerve activity measurement renal sympathetic nerve activity measurement 2013-01-07T15:42:29Z Assessment or quantification of the presence and/or amount of recordable electrical energy in a renal sympathetic nerve, a nerve of the autonomic nervous system that regulates involuntary and automatic reactions, especially to stress, associated with and controlling activity of the kidneys. A nerve is any of the cordlike structures that convey impulses between the central nervous system and one or more parts of the body, and that each consist of an outer connective tissue sheath surrounding a bundle of conductive fibers. CMO:0001237 JSmith RSNA measurement clinical_measurement_ontology