What happened
Angel Medical Systems applied to the Centers for Medicare & Medicaid Services (CMS) for transitional pass-through payment for its AngelMed Guardian System. The implant alarms the patient when the heart's ST segment shifts from the patient's baseline over the prior 24 hours. FDA approved it on 9 April 2018. In the ALERTS trial, 907 implanted patients were randomized to active or deactivated alarms. At the 7-day look-back window, median time to arrival at a medical facility was 51 minutes for treated patients and 30.6 hours for controls. The composite primary endpoint was not statistically significant. An expanded analysis that FDA proposed added follow-up from after the randomized period. In it, median arrival for acute coronary events was 1.7 hours with alarms on and 8.0 hours with alarms off. In its final rule of 16 November 2021, CMS agreed that the Guardian meets the substantial clinical improvement criterion and approved pass-through payment from 1 January 2022. The figures come from the maker's trial. In March 2016 an FDA advisory panel had voted 12-0 that there was no reasonable assurance of effectiveness.
Sources
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Regulatory document, by authors with no tie to the system.
Given the additional endpoints evaluated in the expanded analysis that specifically show faster visits for real events while not increasing unnecessary emergency department visits, we agree that the Guardian[supreg] system meets the substantial clinical improvement criterion
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Regulatory document, by authors with no tie to the system.
The AngelMed device improves diagnostic accuracy of ACS in a clinically meaningful portion of the intended use population, and the risks associated with use of the device are acceptable.
Details
AI system
- Workflow
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The implant sensed the heart's electrical signal through a lead in the right ventricle and compared ST-segment changes with the patient's baseline over the prior 24 hours. When it detected an abnormal shift, the implant vibrated and an external device flashed and beeped. Patients were told to seek urgent care when the alarm went off, even without symptoms.
Follow-up
- Conditions for replication
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The patient has had a prior acute coronary syndrome event and remains at high risk of another. The patient can feel the implant's vibration and respond to the alarms. Patients still act on symptoms when no alarm sounds.
Entry details
- Sector
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Healthcare (cardiology).
- Purpose
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Angel Medical Systems built the AngelMed Guardian System to detect acute coronary syndrome events from the heart's electrical signal and alert patients to seek urgent care.
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Cite this record
Peter H. Vartanian. (2026). Medicare credits the Guardian implant with faster heart attack visits (AIBD-1006). Artificial Intelligence Benefits Database, edition of 1 November 2026. https://petervartanian.xyz/aibd/records/AIBD-1006.html (archived at https://doi.org/10.7910/DVN/AADSII, version 7.0)