Observational Study of ICD and Pacemaker Sensing in the Presence of IMED-4 Operation

Inclusion Criteria: * Subjects with an active implantable CRM device * Subjects \> 18 years of age * Subjects who are ambulatory not requiring assistance for ambulation * Subjects who have been informed of the nature of the study and agree to its provisions and have provided written informed consent as approved by the IRB Exclusion Criteria: * Subjects who are pregnant or lactating or who have been pregnant within the past three months * Subjects who have tattoos on the back in the electrode patch placement region * Subjects who have had a past allergic reaction to adhesives * Subjects who have poor general physical/mental health that, in the opinion of the investigator, will not allow the subject to be a good study candidate (i.e. other disease processes, mental capacity, substance abuse, shortened life expectance, etc.)