Zio AT ECG Monitoring System, ZEUS System

K181502

iRhythm Technologies, Inc. · cleared 2018-08-29 · product code DQK · Cardiovascular

Premarket evidence — what FDA accepted

Device typesamd
source quote (p.5)
“The ZEUS System is an electrocardiogram (ECG) analysis and reporting software system, designed to process continuously recorded, signal-lead ECG data.”
Algorithmupdating its rhythm classification algorithm from a rule and machine-learning implementation to a deep-learning basis
source quote (p.5)
“The ZEUS System is considered modified as a result of updating its rhythm classification algorithm from a rule and machine-learning implementation to a deep-learning basis.”
Adaptive (vs locked)FDA source did not state this
PCCPFDA source did not state this
Cybersecurity addressedYes
source quote (p.8)
“Additionally, the information presented in this submission has been developed in consideration of the recommendations contained in FDA Guidance documents, “Guidance for the Content of Premarket Submissions for Software Contained in Medical Devices” and “Content of Premarket Submission for Management of Cybersecurity in Devices”.”

Validation studies (1)

Bench

sample size not stated

standards: AAMI ANSI EC57: 2012, Testing and Reporting Performance Results of Cardiac Rhythm and ST-Segment Measurement Algorithms, 60601-2-47:2012, Medical Electrical Equipment- Part 2-47: Particular requirements for the basic safety and essential performance of ambulatory electrocardiographic systems

Reported performance (0 observations)

FDA source did not state a quantitative performance metric — non-reporting is itself the signal.

Each value carries its own analysis unit and task — never compare or pool across devices. Source: 510(k) summary PDF.

Predicate network

Postmarket — what happened after clearance

28
recalls in product code, 24mo
423
MAUDE reports in code, 12mo
-1%
vs code's own 3-yr baseline
3
drift signals on this device
  • re_clearance

    The FDA AI/ML device list shows a newer 510(k) K222389 (decision 2023-02-15) from iRhythm Technologies, Inc. for a matching device line ("ZEUS System") — a new clearance for the same line is a change event.

    first seen 2026-07-08 · k_number:K222389

  • recall_reason_pattern

    Software/algorithm-related recall in product code DQK (Spacelabs Healthcare, Ltd. Unit B Foxholes Centre; John Tate Road Hertford United Kingdom, initiated 2025-09-16): "Due to two distinct issues: 1. During patient admission, patient demographic fields may default to those of a previously viewed patient. 2. Systems configured with Resting/Rhythm " Recalling firm is another firm in the same product code.

    first seen 2026-07-08 · recall res_event_number:97686

  • recall_reason_pattern

    Software/algorithm-related recall in product code DQK (Boston Scientific Corporation, initiated 2024-09-05): "Boston Scientific has received reports indicating the grid mark overlay on the cross-sectional view did not present correctly when an OptiCross 18 Peripheral Imaging Catheter was c" Recalling firm is another firm in the same product code.

    first seen 2026-07-08 · recall res_event_number:95331

Recall and MAUDE counts are product-code-level (reports aren't reliably attributable to one device); a recall is shown as device-attributed only when the recall record itself lists this clearance number. Signals are descriptive observables with sources — never a judgment that the device is unsafe or drifting. Snapshot 2026-07-08.

Reimbursement — how devices like this got paid

Not yet tracked — no payment pathway indexed for this clearance (the reimbursement corpus is a growing seed set).

Applicable FDA guidance — what the submission is measured against

FDA guidance documents and guiding principles applicable to 510(k) AI/ML devices in the Cardiovascular panel. A curated reference index, not legal or regulatory advice — each item states its own status, and a draft is never binding.

Applicability is derived from the device's FDA advisory panel and pathway — cross-cutting guidances apply to every AI/ML device; panel-specific ones are flagged. Titles, dates, and links verified against fda.gov as of July 2026.

Constat Precedent · public FDA/CMS data · descriptive decision-support, not regulatory or reimbursement advice. Share this page: constat.dev/precedent/device/K181502