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Effects of active magnetic fields on permanently implanted triggered pacemakers

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Nicholas P. D. Smyth, John M. Keshishian, Oliver C. Hood, Archie A. Hoffman, Edward Podolak, Norman R. Baker · 1973

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Airport magnetic weapons detectors up to 1.35 gauss pose no clinically significant risk to pacemaker patients.

Plain English Summary

Summary written for general audiences

Researchers tested 52 pacemaker patients against magnetic fields from airport weapons detectors (100 Hz to 450 kHz, 0.5-1.35 gauss) to assess hijacking prevention safety. Standard pacemakers showed no interference, while newer atrial and synchronous models had minimal, clinically insignificant effects. The study confirmed airport magnetic detectors pose no health risks to pacemaker patients.

Why This Matters

This 1973 study represents crucial early research into EMF safety for vulnerable populations - exactly the kind of proactive testing we need more of today. The researchers tested real-world exposure scenarios before widespread deployment, finding that even sensitive cardiac devices could handle magnetic fields up to 1.35 gauss across a broad frequency range. What's particularly relevant is how this compares to modern EMF exposures: today's wireless devices operate at much higher frequencies (gigahertz range) but typically at lower field strengths than these magnetic detectors. The study demonstrates that proper safety testing can distinguish between theoretical concerns and actual health risks, providing a model for how we should evaluate new EMF technologies before mass adoption.

Exposure Information

Specific exposure levels were not quantified in this study.

Cite This Study
Nicholas P. D. Smyth, John M. Keshishian, Oliver C. Hood, Archie A. Hoffman, Edward Podolak, Norman R. Baker (1973). Effects of active magnetic fields on permanently implanted triggered pacemakers.
Show BibTeX
@article{effects_of_active_magnetic_fields_on_permanently_implanted_triggered_pacemakers_g6840,
  author = {Nicholas P. D. Smyth and John M. Keshishian and Oliver C. Hood and Archie A. Hoffman and Edward Podolak and Norman R. Baker},
  title = {Effects of active magnetic fields on permanently implanted triggered pacemakers},
  year = {1973},
  
  
}

Quick Questions About This Study

No, this study of 52 pacemaker patients found that airport magnetic weapons detectors (0.5-1.35 gauss, 100 Hz to 450 kHz) caused no clinically significant interference with any type of pacemaker tested, including sensitive atrial and synchronous models.
The airport weapons detectors tested generated magnetic fields ranging from 0.5 to 1.35 gauss (zero to peak) across frequencies from 100 Hz to 450 kHz, which researchers found safe for all pacemaker types.
Newer, more sensitive pacemaker systems for atrial, A-V synchronous, and A-V sequential pacing showed minimal effects from magnetic field exposure, but these effects were not clinically significant and posed no health risks.
Fifty-two patients with various pacemaker types (ventricular, atrial, A-V synchronous, and A-V sequential) were tested using continuous ECG monitoring during exposure to magnetic fields from both fixed and portable weapons detectors.
The study tested frequencies from 100 Hz to 450 kHz and found that conventional triggered pacemakers were completely unaffected across this entire range, while unconventional sensitive systems showed only minimal, non-clinical effects.