Cutaneous Heart Sounds Data Collection During Cardiac Resynchronization Therapy (CRT) Optimization Study

Inclusion Criteria:

- Subject must have been implanted with a Medtronic market approved CRT-D device
(Concerto®, Concerto® II, Maximo® II, Consulta®, Protecta™, or Protecta™ XT) within
two years

- Subject must be 18 years of age or older

- Subject or his/her legally authorized representative has signed and dated the study
specific informed consent form ("Consent Form")

- Subject is willing and able to comply with protocol requirements

Exclusion Criteria:

- Subject with atrial tachyarrhythmia or frequent atrial or ventricular ectopy

- Subject is post mitral or aortic valve repair or replacement

- Subject is participating in other research studies that many confound the results of
this study

- Subject is pregnant or in fertile age without secure birth control

- Subject has dementia

- Subject is unwilling to comply with protocol requirements

- Subject has a device and lead system with fractured leads

- Subject cannot undergo an echocardiograph procedure, or is contraindicated to undergo
such a procedure