MAUDE Adverse Event Report: BOSTON SCIENTIFIC CORPORATION RELIANCE 4-FRONT?; IMPLANTABLE LEAD

Model Number	0665
Medical Device Problem Code	High impedance (1291)
Health Effect - Clinical Code	No Clinical Signs, Symptoms or Conditions (4582)
Date of Event	09/26/2025
Type of Reportable Event	Serious Injury
Additional Manufacturer Narrative
If pertinent information is provided in the future, a supplemental report will be submitted.
Event or Problem Description
It was reported that this right ventricular (rv) lead exhibited gradual rising pacing impedances out of range.Technical services (ts) reviewed and noted it was the physician's discretion for when to replace this lead.This lead remains in service.No adverse patient effects were reported.
Additional Manufacturer Narrative
If pertinent information is provided in the future, a supplemental report will be submitted.
Event or Problem Description
It was reported that this right ventricular (rv) lead exhibited gradual rising pacing impedances out of range.Technical services (ts) reviewed and noted it was the physician's discretion for when to replace this lead.This lead remains in service.No adverse patient effects were reported.Additional information was received from the field.This lead was explanted and replaced.This product has not been returned for analysis.No additional adverse patient effects were reported.

• Brand Name: RELIANCE 4-FRONT?
• Common Device Name: IMPLANTABLE LEAD
• Manufacturer (Section D): BOSTON SCIENTIFIC CORPORATION; 4100 hamline avenue north; saint paul MN 55112
• Manufacturer (Section G): BOSTON SCIENTIFIC CORPORATION; road 698, lot no. 12; dorado PR 00646 -260; * 00646-2602
• Manufacturer Contact: timothy degroot ; 4100 hamline avenue north; saint paul, MN 55112 ; 6515826168
• MDR Report Key: 23401017
• Report Number: 2124215-2025-77191
• Device Sequence Number: 13306874
• Product Code: NVY
• UDI-Device Identifier: 00802526496967
• UDI-Public: (01)00802526496967(17)230621
• Combination Product (Y/N): Y
• Initial Reporter State: KY
• Initial Reporter Country: US
• PMA/510(K) Number: P910073
• Number of Events Summarized: 1
• Summary Report (Y/N): N
• Device Implanted Year: 2023
• Device Explanted Year: 2025
• Serviced by Third Party (Y/N): Unknown
• Reporter Type: Manufacturer
• Report Source: Company Representative
• Initial Reporter Occupation: Physician
• Type of Report: Initial,Followup
• Report Date (Section B): 11/17/2025

1 Device was Involved in the Event

1 Patient was Involved in the Event

• Is this an Adverse Event Report?: Yes
• Is this a Product Problem Report?: Yes
• Operator of Device: Lay User/Patient
• Device Expiration Date: 06/21/2023
• Device Model Number: 0665
• Device Catalogue Number: 0665
• Device Lot Number: 506730
• Was Device Available for Evaluation?: No
• Is the Reporter a Health Professional?: Yes
• Type of Report(Section G): Thirty-Day
• Initial Date Received by Manufacturer: 10/03/2025
• Supplement Date Received by Manufacturer: 11/03/2025
• Initial Report FDA Received Date: 10/28/2025
• Supplement Report FDA Received Date: 11/17/2025
• Date Device Manufactured: 06/21/2021
• Is the Device Labeled for Single Use? (Y/N): Yes
• Is This a Single-Use Device that was Reprocessed and Reused on a Patient? (Y/N): No
• Usage of Device: Initial
• Patient Sequence Number: 1
• Outcome Attributed to Adverse Event: Required Intervention; Hospitalization
• Patient Age: 66 YR
• Patient Sex: Female