This episode focuses on the correspondence between a Parkinson's Disease patient and his doctors as they search for a treatment for the disease.  

Can you advise us of the theory behind these ice baths?  It would certainly help me to endure the tortures if I knew more of the reasons why these baths are of aid to the Parkinson's patient.  

I was distressed to learn that the medications had ceased to have any effect but regrettably this is an old story with your problem.