MAUDE Adverse Event Report: IRHYTHM TECHNOLOGIES, INC ZIO XT; RECORDER, MAGNETIC TAPE, MEDICAL

Medical Device Problem Code	Patient-Device Incompatibility (2682)
Health Effect - Clinical Codes	Dyspnea (1816); Erythema (1840); Itching Sensation (1943); Blister (4537); Skin Burning Sensation (4540)
Date of Event	01/18/2025
Type of Reportable Event	Serious Injury
Additional Manufacturer Narrative
Since no serial number was provided for the subject device, no further investigation can be performed.It is unknown whether the patient has sensitive skin or a history of reaction to adhesive.Irhythm was unable to follow up with the patient as no contact information was provided; therefore, no additional information is available.However, skin irritation is a known inherent risk of the device.The device manual warnings section read as follows: do not use the zio xt patch on patients with known allergic reaction to adhesives or hydrogels or with a family history of adhesive skin allergies.Patient may experience skin irritation.If skin irritation such as severe redness, itching or allergic symptoms develop, remove the zio xt patch from the patient¿s chest.This event is being reported per 21cfr803 as a serious injury.This report does not constitute an admission by rhythm that the product described in this report has any defects, or has malfunctioned.These terms are included in form fda 3500a and are fixed terms for selection created by the fda to categorize the type of event solely for the purpose of regulatory reporting.
Event or Problem Description
On february 7, 2025, irhythm became aware of a medwatch report (mw5165294), which stated that a patient exhibited signs of skin irritation allegedly caused by the zio xt.According to the report, the patient experienced bright red discoloration, burning, and itching within the first 4 minutes of application.Additionally, the patient developed shortness of breath.After removing the device, a prominent red mark appeared, accompanied by a blood blister, tenderness, and dryness.The patient reports taking b12 vitamin, a multivitamin and vitamin c as treatment.No further details were provided.

• Brand Name: ZIO XT
• Common Device Name: RECORDER, MAGNETIC TAPE, MEDICAL
• Manufacturer (Section D): IRHYTHM TECHNOLOGIES, INC; 699 8th st suite 600; san francisco CA 94103
• Manufacturer (Section G): IRHYTHM TECHNOLOGIES, INC; 6550 katella avenue, suite 200; cypress CA 90630
• Manufacturer Contact: tara mackinnon ; 699 8th st suite 600; san francisco, CA 94103 ; 6094600577
• MDR Report Key: 21552375
• Report Number: 3007208829-2025-00044
• Device Sequence Number: 18187579
• Product Code: DSH
• UDI-Device Identifier: 00869770000203
• UDI-Public: 00869770000203
• Combination Product (Y/N): N
• PMA/510(K) Number: K121319
• Number of Events Summarized: 1
• Summary Report (Y/N): N
• Serviced by Third Party (Y/N): N
• Reporter Type: Manufacturer
• Report Source: Other,Consumer
• Initial Reporter Occupation: Non-Healthcare Professional
• Type of Report: Initial
• Report Date (Section B): 03/07/2025

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?: No
• Was Device Available for Evaluation?: No
• Type of Report(Section G): Thirty-Day
• Initial Date Received by Manufacturer: 02/07/2025
• Initial Report FDA Received Date: 03/07/2025
• Was Device Evaluated by Manufacturer? (Y/N): No
• 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
• Patient Age: 55 YR
• Patient Sex: Female
• Patient Weight: 75 KG
• Patient Ethnicity: Non Hispanic
• Patient Race: White