Implantable device with post-MRI cardiac signal sensing adjustment

摘要

An implantable device, such as a pacer, defibrillator, or other cardiac rhythm management device, can include an automatic testing and adjusting of cardiac signal sensing after an MRI scanning procedure, such as to accommodate an MRI-induced physiological change in sensed cardiac depolarization amplitude or in lead impedance such as at an electrode/tissue interface.

主权项

1. An apparatus comprising:
an ambulatory or implantable medical device comprising:
a cardiac signal sensing circuit; anda controller circuit, coupled to the cardiac signal sensing circuit, the controller configured to receive an indication that a magnetic resonance imaging (MRI) scanning procedure has completed and, in response, to automatically test a cardiac signal sensing of the cardiac signal sensing circuit, and to automatically adjust and then automatically use the adjusted cardiac signal sensing parameter when a physiological change in depolarization amplitude or lead impedance causes a post-MRI scanning procedure loss of cardiac depolarization sensing.