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

Model Number	G156
Medical Device Problem Codes	Pacing Problem (1439); Failure to Convert Rhythm (1540); Defibrillation/Stimulation Problem (1573); Inappropriate/Inadequate Shock/Stimulation (1574)
Health Effect - Clinical Codes	Ventricular Fibrillation (2130); Shock from Patient Lead(s) (3162)
Date of Event	12/29/2025
Type of Reportable Event	Serious Injury
Event or Problem Description
It was reported that this cardiac resynchronization therapy defibrillator (crt-d) delivered three rounds of inappropriate anti-tachycardia pacing (atp) and eight inappropriate shock(s) due to an episode of atrial arrhythmia.Device experienced therapy exhaustion.The device accelerated the rhythm to ventricular fibrillation (vf) and therapy failed to convert.This device was "[ponga resolution si lo tiene y si omita]".The device remains in service.No adverse patient effects were reported.
Event or Problem Description
It was reported that this cardiac resynchronization therapy defibrillator (crt-d) delivered three rounds of inappropriate anti-tachycardia pacing (atp) and eight inappropriate shock(s) due to an episode of atrial arrhythmia.Device experienced therapy exhaustion.The device accelerated the rhythm to ventricular fibrillation (vf) and therapy failed to convert.The device remains in service.No adverse patient effects were reported.
Additional Manufacturer Narrative
Corrected fields: b5.Describe event or problem.This product investigation is still in progress.This report will be updated when product investigation is complete.
Event or Problem Description
It was reported that this cardiac resynchronization therapy defibrillator (crt-d) delivered three rounds of inappropriate anti-tachycardia pacing (atp) and eight inappropriate shock(s) due to an episode of atrial arrhythmia.Device experienced therapy exhaustion.The device accelerated the rhythm to ventricular fibrillation (vf) and therapy failed to convert.The device remains in service.No adverse patient effects were reported.
Additional Manufacturer Narrative
The device was not returned for analysis; therefore, a technical analysis could not be performed.A review of the device history record (dhr) was performed.The review of the dhr identified that there were no process related non-conformances, scrap, or rework performed during the production that could explain the event.The reviews ensure each device meets specification prior to release for use.There is no indication the device manufacturing process contributed to the reported complaint.A risk review was completed and confirmed that the event of atp delivered when not required was defined in the risk documentation.This event type has been accounted for during product risk analysis to support acceptable risk benefit for the product.Review of labeling determined that the complaint situation was listed in the manual.There was no indication in the complaint that the product was not used in accordance to labeling.The manual was unlikely to be the cause of the reported complaint; translation, wording, or graphics does not require further review.Based on a thorough review of the reported complaint, boston scientific has assigned an investigation conclusion code of known inherent risk of device.

• Brand Name: DYNAGEN? X4 CRT-D
• Common Device Name: CARDIAC RESYNCHRONIZATION THERAPY DEFIBRILLATOR
• 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: 24117356
• Report Number: 2124215-2026-03576
• Device Sequence Number: 5941274
• Product Code: NIK
• Combination Product (Y/N): N
• Initial Reporter State: MD
• Initial Reporter Country: US
• PMA/510(K) Number: P010012
• Number of Events Summarized: 1
• Summary Report (Y/N): N
• Device Implanted Year: 2020
• Reporter Type: Manufacturer
• Report Source: Health Professional
• Initial Reporter Occupation: Physician
• Type of Report: Initial,Followup,Followup
• Report Date (Section B): 05/22/2026

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: 10/29/2022
• Device Model Number: G156
• Device Catalogue Number: G156
• Device Lot Number: 386602
• Was Device Available for Evaluation?: No
• Is the Reporter a Health Professional?: Yes
• Was the Report Sent to FDA?: No
• Type of Report(Section G): Thirty-Day
• Initial Date Received by Manufacturer: 12/29/2025
• Supplement Date Received by Manufacturer: 05/18/2026; 05/21/2026
• Initial Report FDA Received Date: 01/20/2026
• Supplement Report FDA Received Date: 05/18/2026; 05/22/2026
• Was Device Evaluated by Manufacturer? (Y/N): No
• Date Device Manufactured: 11/06/2020
• 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: Other; Life Threatening
• Patient Age: 64 YR
• Patient Sex: Female