leader, ECG, electrocardiograph, drain, EKG, SA node, catheter, drip, cardiac pacemaker, balloon, EEG, artificial pacemaker, defibrillator, sinoatrial node, electrocardiogram, pacesetter, trendsetter, pacer.

The experienced horseman knows that a horse is unable to attain his greatest speed apart from a pacemaker. - "Increasing-Human-Efficiency-in-Business-a-contribution-to-the-psychology-of-business", Scott, Walter Dill.

Then Jimmie, missing perhaps the blue little figure of his pacemaker, wavered a little, only a little, but enough to allow Len Fogarty to forge past him. - "New Faces", Myra Kelly.

cardiac pacemaker, artificial pacemaker, pacesetter.