sphygmo-, sphygm-, -sphyxia

(Greek: pulse, pulsation; throbbing)

sphygmoviscosimetry (s) (noun), sphygmoviscosimetries (pl)
sphygmus (s) (noun), sphygmi (pl)
The pulse beat or the throbbing of the heart.
sphymosignal (s) (noun), sphymosignals (pl)