Synonyms for Pacemaker:

n.

defibrillator, balloon, eeg, drip, catheter, electrocardiogram, electrocardiograph, ekg, drain, ecg. cognition (noun)
pacesetter.
front-runner (noun)
pacesetter.
pacemaker (noun)
artificial pacemaker, sinoatrial node, pacesetter, Sa Node, pacer, cardiac pacemaker.

Other synonyms:

SA node
Sa Node.
Other relevant words:
defibrillator, balloon, eeg, drip, catheter, electrocardiogram, electrocardiograph, ekg, drain, ecg.