Sentence:  The Mecholyl and noradrenalin tests applied with certain precautions are reliable indicators of this central autonomic balance , but for the sake of correlating autonomic and clinical states , and of studying the effect of certain therapeutic <WSD>procedures</WSD> on central autonomic reactions , additional tests seem to be desirable . 
Meaning of the word marked with <WSD> tags:  a particular course of action intended to achieve a result