Magnetic Interference on Cardiac Implantable Electronic Devices From Apple iPhone MagSafe Technology

{
  "publication_year": 2021,
  "study_type": "other",
  "exposure": {
    "band": null,
    "source": "mobile phone (Apple iPhone 12 Pro Max MagSafe magnets/wireless charging)",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": "Consecutive patients with previously implanted cardiac implantable electronic devices (CIEDs) presenting to an electrophysiology laboratory",
  "sample_size": 3,
  "outcomes": [
    "Clinically identifiable magnet interference / magnet mode activation in CIEDs",
    "Potential inhibition of lifesaving therapy (as described by authors)"
  ],
  "main_findings": "In this case series with in vivo and ex vivo components, direct placement of an iPhone 12 Pro Max over the CIED pocket produced clinically identifiable magnet interference in 3/3 participants in vivo. In ex vivo testing of packaged CIEDs from major companies, magnet interference occurred in 8/11 devices.",
  "effect_direction": "harm",
  "limitations": [
    "Small sample size",
    "Selected device types tested; results may not be generalizable",
    "Case series design"
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "stance": "concern",
  "stance_confidence": 0.86,
  "summary": "This report evaluated whether Apple iPhone 12 Pro Max MagSafe magnets can interfere with cardiac implantable electronic devices (CIEDs) using in vivo testing in patients and ex vivo testing of devices in unopened packages. The authors report clinically identifiable magnet interference in all 3 in vivo participants and in 8 of 11 devices ex vivo. They conclude MagSafe technology can cause magnet interference and may inhibit lifesaving therapy, while noting the small sample and limited generalizability.",
  "key_points": [
    "The study included both in vivo testing in patients with implanted CIEDs and ex vivo testing of packaged CIEDs.",
    "An iPhone 12 Pro Max placed directly over the CIED pocket triggered magnet interference in 3/3 participants.",
    "Ex vivo, 8/11 CIEDs showed magnetic interference when exposed to the iPhone 12 Pro Max.",
    "The authors note magnet mode activation can occur with relatively low magnetic field exposure and that the phone’s field can exceed 50 gauss in direct contact.",
    "They report magnet reversion could be triggered up to 1.5 cm from certain CIEDs in ex vivo testing.",
    "The paper highlights a practical scenario where phones carried in a breast pocket could be close to a CIED.",
    "Limitations include small sample size and testing only selected device types."
  ],
  "categories": [
    "Medical Devices",
    "Consumer Electronics",
    "Electromagnetic Interference"
  ],
  "tags": [
    "Cardiac Implantable Electronic Devices",
    "Pacemakers",
    "Implantable Cardioverter-Defibrillators",
    "MagSafe",
    "Wireless Charging",
    "Smartphones",
    "Magnetic Interference",
    "Magnet Mode Activation",
    "Electrophysiology Lab",
    "Case Series"
  ],
  "keywords": [
    "iPhone 12 Pro Max",
    "MagSafe",
    "magnet interference",
    "CIED",
    "pacemaker",
    "ICD",
    "magnet mode",
    "wireless charging",
    "gauss"
  ],
  "suggested_hubs": [
    {
      "slug": "cell-phones",
      "weight": 0.9,
      "reason": "Study evaluates interference from an iPhone model on implanted cardiac devices."
    }
  ],
  "social": {
    "tweet": "Case series: iPhone 12 Pro Max MagSafe magnets triggered clinically identifiable magnet interference in cardiac implantable electronic devices (3/3 in vivo; 8/11 ex vivo). Small sample; authors note potential to inhibit therapy when phone is very close to the device.",
    "facebook": "A small report tested Apple iPhone 12 Pro Max MagSafe magnets against cardiac implantable electronic devices (CIEDs). The authors observed magnet interference in all 3 patients tested and in 8 of 11 devices ex vivo, highlighting potential issues when a phone is placed very close to a CIED.",
    "linkedin": "Journal report (case series) on Apple iPhone 12 Pro Max MagSafe: direct proximity to cardiac implantable electronic devices produced magnet interference in 3/3 patients and 8/11 devices ex vivo. Authors emphasize proximity risk and note limited generalizability due to small sample size."
  }
}