Pacemakers on a roller test bench - TUMResearch news Pacemakers and defibrillators are often implanted in patients with heart failure or cardiac arrhythmias to regulate heart function. These devices are susceptible to electromagnetic interference, which can potentially occur in electric cars. In a recent study, however, a team led by Dr. Carsten Lennerz, a cardiologist at the German Heart Centre Munich and scientist at the German Centre for Cardiovascular Research (DZHK), concludes that current electric cars pose no threat to patients.