Maximizing CRT Delivery by Using MultipolAr Coronary Sinus Lead FamiLy ACUITY® X4 - RALLY X4 Study

Clinic visits will occur at:

• Enrollment and Consenting Clinic Visit (≤ 30 days prior to implant procedure)
• Implant Procedure (Day 0; all future follow ups based on this date)
• Pre-Discharge Clinic Visit (≤ 7 days post implant procedure) (Required)
• One to 6 Month Clinic Visit (20 to 180 days post implant procedure) (Required)
• Interim Visit(s) (Any time between the 1 to 6 Month Clinic Visit and Close-out Clinic Visit) (Following study center specific standard of care) (Device follow up optional) AE - reporting required
• Close-out Clinic Visit (30 months ± 90 days, OR 180 days ± 90 days after the study is closed to enrollment, whichever comes first) (Required)
• During the trial all AEs, deaths, and changes in the device system must be reported
• Devices of subjects who have received a Latitude device will be followed by the Boston Scientific (BSC) Latitude team. Device Data as defined in the Clinical Investigation Plan (CIP), device alerts, and diagnostic data from the standard Latitude database may be collected and entered into the study database at any time.

Inclusion criteria

• Subject is willing and capable of providing informed consent
• Subject is planned to be implanted with an ACUITY X4® lead for left-ventricular pacing and sensing via the coronary venous system in conjunction with a compatible BSC pulse generator
• Subject is willing and capable of participating in all visits associated with this study at an approved clinical study center and at the intervals defined by this CIP
• Subject is age 18 or above, or of legal age to give informed consent specific to state and national law

Exclusion criteria

• Subjects with a hypersensitivity to a maximum single dose of 0.51 mg dexamethasone acetate
• Subject is enrolled in any other concurrent study without prior written approval from BSC, with the exception of local mandatory governmental registries and observational studies/registries that are not in conflict and do not affect the following:

• Schedule of procedures for the RALLY X4 Study (i.e. should not cause additional or missed visits);
• RALLY X4 Study outcome (i.e. involve medications that could affect the heart rate of the subject);
• Conduct of the RALLY X4 Study per GCP/ ISO 14155:2011/ local regulations as applicable
• Per the implanting physician's discretion, the subject is not a suitable candidate to receive the study device as determined during the implant procedure
• Women of childbearing potential who are or might be pregnant at the time of study enrollment or ACUITY X4® lead implant.
• Subject is unwilling or unable to participate in all scheduled study follow up visits at an approved study center
• Subject does not anticipate being a resident of the area for the scheduled duration of the trial
• Subject's physician does not allow participation

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