MAUDE Adverse Event Report: BOSTON SCIENTIFIC CORPORATION DYNAGEN? X4 CRT-D; CARDIAC RESYNCHRONIZATION THERAPY DEFIBRILLATOR (CRT-D)

Model Number	G156
Medical Device Problem Code	High impedance (1291)
Health Effect - Clinical Code	No Clinical Signs, Symptoms or Conditions (4582)
Date of Event	04/02/2026
Type of Reportable Event	Malfunction
Additional Manufacturer Narrative
This investigation will be updated should pertinent information become available in the future.
Event or Problem Description
It was reported that this cardiac resynchronization therapy defibrillator (crt-d) exhibited sudden high out of range pacing impedance measurements above 3000 ohms in the right ventricular (rv) lead channel.Technical services (ts) was consulted and further in office and x-ray evaluation was recommended.No adverse patient effects were reported.This device remains in service.

• Brand Name: DYNAGEN? X4 CRT-D
• Common Device Name: CARDIAC RESYNCHRONIZATION THERAPY DEFIBRILLATOR (CRT-D)
• Manufacturer (Section D): BOSTON SCIENTIFIC CORPORATION; 4100 hamline avenue north; saint paul MN 55112
• Manufacturer (Section G): BOSTON SCIENTIFIC CORPORATION; cashel road; clonmel ; EI
• Manufacturer Contact: timothy degroot ; 4100 hamline avenue north; saint paul, MN 55112 ; 6515826168
• MDR Report Key: 25029600
• Report Number: 2124215-2026-23017
• Device Sequence Number: 21364053
• Product Code: NIK
• UDI-Device Identifier: 00802526534669
• UDI-Public: (01)00802526534669(17)190517
• Combination Product (Y/N): N
• Initial Reporter State: CA
• Initial Reporter Country: US
• PMA/510(K) Number: P010012
• Number of Events Summarized: 1
• Summary Report (Y/N): N
• Device Implanted Year: 2017
• Serviced by Third Party (Y/N): Unknown
• Reporter Type: Manufacturer
• Report Source: Health Professional
• Initial Reporter Occupation: Other Health Care Professional
• Type of Report: Initial,Followup
• Report Date (Section B): 06/15/2026

1 Device was Involved in the Event

1 Patient was Involved in the Event

• Is this an Adverse Event Report?: No
• Is this a Product Problem Report?: Yes
• Operator of Device: Lay User/Patient
• Device Expiration Date: 05/17/2019
• Device Model Number: G156
• Device Catalogue Number: G156
• Device Lot Number: 376846
• 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: 04/06/2026
• Supplement Date Received by Manufacturer: 06/12/2026
• Initial Report FDA Received Date: 04/29/2026
• Supplement Report FDA Received Date: 06/15/2026
• Date Device Manufactured: 05/26/2017
• 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
• Patient Age: 68 YR
• Patient Sex: Male