De-Kun Li, MD, PhD Division of Research, Kaiser Foundation Research - - PowerPoint PPT Presentation

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De-Kun Li, MD, PhD Division of Research, Kaiser Foundation Research - - PowerPoint PPT Presentation

Jan 22, 2024 243 likes •334 views

Effect of Exposure to Magnetic Fields on Pregnancy Outcomes, Health of Offspring, and Male Fertility De-Kun Li, MD, PhD Division of Research, Kaiser Foundation Research Institute, Kaiser Permanente, Oakland, California Story of EMF Health

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SLIDE 1

Effect of Exposure to Magnetic Fields on Pregnancy Outcomes, Health of Offspring, and Male Fertility

De-Kun Li, MD, PhD

Division of Research, Kaiser Foundation Research Institute, Kaiser Permanente, Oakland, California

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SLIDE 2

Story of EMF Health Effect

  • Discovery in 1979:

– Findings by Nancy Wertheimer and Ed Leeper – Their incredible luck – Their two legacies

  • Poor EMF measurements
  • Outcome inefficient to study
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SLIDE 3

History of EMF Research

  • Evolution of EMF measurements:

– Wire codes – Interview about occupational history – Distance from power lines or power stations – Home spot measurement – Personal EMF measurements (24 hours)

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SLIDE 4

History of EMF Research

  • Inefficient outcomes being studied:

– Cancers

  • Childhood leukemia
  • Brain tumors
  • Other cancers including breast cancer

– Long latency – Exacerbate the problem of EMF exposure misclassification

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SLIDE 5

Problems with EMF Research

  • Crude measure of EMF exposure
  • Outcomes inefficient to study
  • Mostly retrospective studies (case-control

studies with surrogate measures of EMF)

  • Physicists’ involvement_ a mistake

– Focus on energy – Other mechanisms: cell-to-cell communications

  • Lack of extensive research
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SLIDE 6

Misconception about EMF Health Effect

  • Most studies were negative
  • It has been proven safe
  • Power line EMF

– Low frequency 50-1000 Hz

  • Wireless (cell phone) EMF

– High frequencies > 1 MHz

  • Power line EMF and wireless EMF different
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SLIDE 7

Findings on In-utero EMF Exposure

  • Exposure to high level of magnetic fields during

pregnancy is associated with an increased risk of: – Miscarriage – Asthma in offspring

  • Prospective design
  • Dose-response relationship
  • Synergistic effect with known risk factors

– For miscarriage: a history of miscarriage – For asthma in children: maternal history of asthma and firstborn child

  • Typical day: stronger association
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SLIDE 8

Findings on EMF Exposure Effects

  • n Men
  • Exposure to high level of magnetic fields is

associated with an increased risk of

– Poor semen quality (abnormal motility and morphology)

  • A dose-response relationship
  • Typical day: stronger association