Where does “心不全” come from?

心不全 (Japanese) comes from Japanese 心, from Old Japanese 心, from Proto-Japonic *kəkərə.

心不全 (Japanese): heart failure

Definitions

Step	Language	Word	Meaning
1	Japanese	心	mind, heart, spirit, soul; thoughts, ideas;...
2	Old Japanese	心	heart, mind, spirit; emotion, feeling; heart,...
3	Proto-Japonic	*kəkərə	—

心不全 — Etymology, Origin & Word History | Etymology Explorer