Had a 22 year old under stress at work and home complaining of dsypnea, cold and numb extremities. Unable to move fingers. Put him on the capnography.
Respiratory rate of 40, ETCO2 of 26.
After coaching him to slow his breathing, hir respiratory rate went down to 10 and his ETCO2 went up to 40. The cold numb feeling went away and he was able to move his fingers again.