Motors can cause interference with defibrillators. Below is a link from the Medtronic site.
http://www.medtronic.com/wcm/groups/mdtcom_sg/@mdt/@crdm/documents/documents/electromagnetic-compatibility.pdf
IT CAN AS I WAS RECENTLY TOLD NO LEANING OVER RUNNING ENGINE AS THIS COULD CAUSE PROBLEMS FOR A PACE MAKER AS WELL