The Symphony Breast Pump has passed the required EMC standards for medical devices; however, this testing is not specific to pacemakers. It is recommended that you consult with a licensed healthcare professional. The Medela Harmony® Manual Breast Pump | Medela is always an option in case there is a concern with using an electric breast pump. Here is also a link with helpful information Devices that May Interfere with ICDs and Pacemakers | American Heart Association.