MAUDE Adverse Event Report: ZOLL MANUFACTURING CORPORATION LIFEVEST WCD 4000 SYSTEM; WEARABLE CARDIOVERTER DEFIBRILLATOR

Model Number LIFEVEST WCD 4000 SYSTEM

Device Problem Inappropriate/Inadequate Shock/Stimulation (1574)

Patient Problems Loss of consciousness (2418); Shock from Patient Lead(s) (3162); Appropriate Clinical Signs, Symptoms, Conditions Term / Code Not Available (4581)

Event Date 11/28/2022

Event Type  Injury  

Event Description

The patient was inappropriately treated 1 time by the lifevest.The patient was reportedly unconscious at the time of the event.Vt that self-converted contributed to the false detection.The response buttons were pressed earlier in the detection sequence but not immediately prior to shock delivery.The response buttons functioned appropriately.The patient received 1 appropriate treatment during vt.The arrhythmia was converted to a slower rhythm.No injury was reported from the treatment.The patient went to the hospital for evaluation.The patient continues to use the lifevest.No deficiencies were alleged against the device.

Manufacturer Narrative

The monitor and electrode belt have been returned to the distributor.An investigation has not yet been completed on the electrode belt.Device evaluation of monitor has been completed.The reported problem (patient treatments) was confirmed.During the incoming functional testing, a 1hz simulated normal sinus rhythm signal was applied to the monitor, followed by a 5hz simulated treatable arrhythmia signal which verified proper performance of the detection algorithm.During the transition to the 5hz signal, the device was confirmed to properly enter into a treatment sequence which includes a verification of the audio messaging and siren alarms, as well as a test of the pulse delivery circuitry.The pulse delivery circuitry test verified proper charging of the high voltage capacitors and proper delivery of five full energy 150j biphasic pulses.The functional testing confirmed proper response button functionality, ecg acquisition, detection algorithm performance, and pulse delivery functionality.There is no indication of a product malfunction causing or contributing to the inappropriate treatment.Inappropriate defibrillations are an anticipated risk associated with the use of the lifevest.Patients are instructed through alarms, voice messages, ifu, and training to press the response buttons to prevent an inappropriate defibrillation.The current commercial inappropriate defibrillation rate is consistent with the observed rate during the pivotal clinical trial g960083 (0.69% per patient-month with 90% confidence).A summary of the safety and effectiveness data (ssed), including the inappropriate defibrillation safety objective supporting fda's approval of the lifevest, can be found at http://www.Accessdata.Fda.Gov/cdrh_docs/pdf/p010030b.Pdf.The lifevest detection algorithm complies with iec 60601-2-4 performance requirements for sensitivity and specificity.

• Brand Name: LIFEVEST WCD 4000 SYSTEM
• Type of Device: WEARABLE CARDIOVERTER DEFIBRILLATOR
• Manufacturer (Section D): ZOLL MANUFACTURING CORPORATION; 121 gamma drive; pittsburgh PA 15238
• Manufacturer (Section G): ZOLL MANUFACTURING CORPORATION; 121 gamma drive; pittsburgh PA
• Manufacturer Contact: zoll mfg corporation ; 121 gamma drive; pittsburgh, PA 15238
• MDR Report Key: 15939964
• MDR Text Key: 305062925
• Report Number: 3008642652-2022-26341
• Device Sequence Number: 1
• Product Code: MVK
• Combination Product (y/n): N
• Reporter Country Code: US
• PMA/PMN Number: P010030
• Number of Events Reported: 1
• Summary Report (Y/N): N
• Report Source: Manufacturer
• Source Type: Distributor
• Reporter Occupation: Other
• Type of Report: Initial
• Report Date: 12/08/2022

1 Device was Involved in the Event

1 Patient was Involved in the Event

• Date FDA Received: 12/08/2022
• Is this an Adverse Event Report?: Yes
• Is this a Product Problem Report?: No
• Device Operator: Lay User/Patient
• Device Model Number: LIFEVEST WCD 4000 SYSTEM
• Date Manufacturer Received: 11/30/2022
• Is the Device Single Use?: No
• Is This a Reprocessed and Reused Single-Use Device?: No
• Type of Device Usage: Reuse
• Patient Sequence Number: 1
• Patient Outcome(s): Hospitalization