an electrocardiograph

(anatomy) a heart

to use / to employ / to make use of, to apply / to spend

doctor

confirmation

confirm, make sure, check, verify

the state or condition (of something at a certain time)

an electromyograph

mind, heart, spirit, soul; thoughts, ideas / attention, mind, interest / heart, feelings, emotion, emotional state / wholeheartedness, sincerity, true heart

plan, total