Strange sensation in stroke patient

Hi everyone!

I have a 56 years old male patient with left side stroke. He had stroke 19 months back and since than physiotherapy sessions 3 times a week. Very good ballance, trunk control in sitting and standing, poor proprioception and body perception on the affected side. At the moment he feels pins and needles most of the time on lower and upper limp.It has started 3 weeks ago. PT is able to feel low temperature. When ice is beeing applied on extensors PT's arm relaxes and fingers are opening. Is it typical for stroke patient to have sensory deficit for such a long time of the time? I assumed that it depends on severity of stroke. Are there any other ways of stimulating patients sensations? I'll be grateful for any more information.

Thanks.

I'm just a stroke survivor, I didn't have this problem but in my research I found this on thermal stimulation.http://myweb.ncku.edu.tw/~fzshaw/ASA.pdf
researchers found that cycles of heat and cold significantly enhanced the
sensory and motor function in the arms and hands of stroke survivors after a few weeks of therapy. I wish there was someplace that listed all the various therapies and their efficiency, Especially for those patients that are no longer able to receive therapy and those whose medical team is out-of-date.
Dean