Measuring Physical Activity With Implanted Cardiac Devices: A Systematic Review.

Physical activity is predictive of cardiovascular outcomes in patients with cardiovascular implantable electronic devices, yet it is not regularly assessed in routine care. Current-generation cardiovascular implantable electronic devices, however, continuously monitor patient activity through a built-in accelerometer, which provides new opportunities to remotely assess patient activity, detect changes in clinical status, and incorporate these data in risk stratification models. This review critically examines the literature on device-measured physical activity (D-PA), with a focus on identifying methodological issues that may affect interpretation of study results.