I probably used the wrong term, .
But I do think the risk of stroke is very very low.
Nucca is totally different from the usual chiro adjusting.

But as always seek out an expert in any therapy or treatment you try.

Some info about Nucca / also called Upper Cervical adjustment (atlas/axis, c1, c2)
[POSTURE IS A WINDOW INTO A PERSON'S HEALTH
Upper Cervical misalignment = Poor Posture = Poor Health

The following Signs and Symptoms may indicate Upper Cervical (c0-c1-c2) Injury]
http://www.upcspine.com/self.htm
http://www.upcspine.com/anatomy2.htm

here's one vid but many more can be found-
http://www.youtube.com/watch?v=0TPEX...hannel&list=UL