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    Cardiac Rhythm Management

    Implantable and external devices that monitor and treat cardiac arrhythmias, pacemakers, ICDs, CRT devices, and insertable cardiac monitors.

    Reviewed by Christian Espinosa, Founder, Blue Goat CyberLast reviewed May 9, 2026

    Definition

    Cardiac Rhythm Management (CRM) is the MedTech segment that develops devices for diagnosing and treating bradyarrhythmias, tachyarrhythmias, and heart failure conduction disorders. The category covers permanent pacemakers (single, dual, leadless), implantable cardioverter defibrillators (ICDs), cardiac resynchronization therapy (CRT-P, CRT-D), insertable cardiac monitors (ICMs), and the leads, programmers, and remote-monitoring infrastructure that surround them. CRM devices are almost exclusively Class III in the US (PMA pathway) because they support or sustain life, and almost all modern CRM systems include wireless telemetry that places them squarely under FDA's Section 524B cyber device authority.
    What the regulation says
    Most CRM devices follow PMA (21 CFR 814) and are governed by FDA-recognized consensus standards including ISO 14708-1/-2/-6 (active implantable medical devices) and IEC 60601-2-31. ICDs and pacemakers are subject to dedicated FDA guidance on premarket submissions and to mandatory MDR reporting under 21 CFR Part 803. Connected CRM systems are cyber devices under Section 524B of the FD&C Act and must include a SBOM, vulnerability monitoring plan, and coordinated disclosure process.

    What this means in practice

    CRM is one of the highest-revenue MedTech segments and a leading source of post-market cybersecurity advisories (Medtronic CareLink/Conexus, St. Jude Merlin@home). Market dynamics are shaped by leadless pacing, extravascular ICDs, conduction-system pacing, and remote-monitoring reimbursement (CPT 93294-93298).

    Examples

    • A patient experiencing chronic bradycardia receives an implantable pulse generator designed to deliver electrical impulses to the heart, ensuring a consistent and appropriate heart rate to alleviate symptoms like dizziness and fatigue.
    • Individuals at high risk for life-threatening ventricular arrhythmias may be implanted with a device that continuously monitors heart activity and can deliver a high-energy shock to restore a normal rhythm if a dangerous arrhythmia is detected.
    • A heart failure patient undergoes implantation of a specialized device that coordinates the contractions of the heart's ventricles, improving the heart's pumping efficiency and overall cardiac function.
    Common pitfalls
    • •Treating CRM telemetry links as a closed system, they are cyber-device interfaces under 524B.
    • •Underestimating the regulatory burden of lead changes, which often require a PMA supplement.
    • •Ignoring remote-monitoring reimbursement codes that materially shape product economics.

    Frequently asked questions

    They go through PMA like traditional pacemakers but are reviewed under their own product codes (e.g., NVZ for leadless single-chamber). FDA has issued device-specific guidance for them.

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    Sources

    3 sources

    Sources support the definition or relevant regulatory context, not necessarily every claim on this page. Each is graded against our source-tier hierarchy so you can see what rests on binding law versus commentary.

    Tier 1Binding law and standards· 1Tier 2Regulator guidance and consensus· 1Tier 4Trade press and expert commentary· 1
    Link health: 3 verified· last checked 2026-06-20
    FDA·1ISO·1HRS·1
    1. 1
      FDA, Pacemakers
      Tier 2 Verified
      FDAfda.gov
    2. 2
      ISO 14708-2 Active implantable medical devices, Pacemakers
      Tier 1 Verified
      ISOiso.org
    3. 3
      Heart Rhythm Society Remote Monitoring Consensus
      Tier 4 Verified
      HRShrsonline.org

    Inline markers like [1] jump to the matching reference above.