An ICD procedure, like any other procedure, comes with a set of hazards, which include:

• Infection at the implant site
• Allergic reaction to the anaesthetics used during the operation
• Swelling, bleeding, or bruising around the site of your ICD implantation
• Damage to the vein where your ICD leads are placed
• Bleeding around your heart, which is life threatening
• The ICD lead is leaking blood through the cardiac valve where it is attached.
• Collapsed lung (pneumothorax)

Reference: Implantable cardioverter-defibrillators (ICDs). (2021, August 27). Retrieved from https://www.mayoclinic.org/tests-procedures/implantable-cardioverter-defibrillators/about/pac-20384692