Implantable cardioverter-defibrillator (icd) tachyarrhythmia detection modifications responsive to detected pacing

A system comprising:

• an implantable pacemaker device;
• and
• an extravascular implantable cardioverter-defibrillator (ICD) system that includes an ICD device electrically connected to at least one lead having one or more electrodes, wherein the ICD device includes:
• a sensing module configured to obtain electrical signals from the one or more electrodes;
• and
• a control module configured to process the electrical signals from the sensing module in accordance with a tachyarrhythmia detection algorithm to monitor for a tachyarrhythmia, wherein the control module is further configured to detect initiation of a pacing train delivered by the implantable medical device, determine a type of the detected pacing train, and modify the tachyarrhythmia detection algorithm based on the type of the detected pacing train.