Ulrika Birgersdotter-Green, MD (IMAGE) University of California - San Diego Caption Ulrika Birgersdotter-Green, MD, director of Pacemaker and ICD Service at UC San Diego Health, states that placing the defibrillator leads outside the vascular allows the device to offer more pacing, or heart stimulation, in the event of a sudden cardiac arrest. Credit UC San Diego Health Sciences Usage Restrictions Use photo credit License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.