2006-05-05-世界卫生组织-2006_WHO_Research_Agenda_for_Static_Fields_6页_75kb

2006 WHO Static Fields Research Agenda Summary

Introduction

• Developed in 1997 by the WHO International EMF Project to coordinate global research on potential health effects of electromagnetic fields (EMF).
• Primarily concerned with static electric and magnetic fields.
• Review in 2004 identified current gaps in knowledge.
• Conclusion on Static Electric Fields: Limited research benefit; no significant workplace/living exposure; no recommended further research.
• Conclusion on Static Magnetic Fields: Research needs coordination due to lack of systematic approaches and methodological rigor.

Research Priority Classification

1. High Priority Research: Directly contributes significantly to reducing uncertainty in health risk assessment. Addresses critical knowledge gaps.
2. Other Research Needs: Useful for better understanding impacts, but contributes indirectly to health risk assessment.

Research Areas & Priorities

I. Epidemiology

• High Priority (Nature of Need):
  • Nested case-control study: Identify highly exposed occupational groups (MRI techs, Al smelters, transport workers) for chronic diseases (e.g., specific cancers). Requires international collaboration for power.
  • Cohort study: Long-term follow-up of high-exposure groups for common short-latency health outcomes.
  • Prospective pregnancy study: Assess risks from chronic occupational exposure and acute exposure from MRI exams.
  • Develop reliable personal dosimeters: Improve exposure assessment (measure field strength, gradient, duration, change rate).
• Other (Nature of Need): Further studies on cognitive/behavioral, cardiac function (at higher fields).

II. Human Volunteer Studies

• High Priority (Nature of Need):
  • Vestibular function/head-eye coordination: Investigate worsening in MRI-like environments (due to gradients). Focus on vertigo mechanisms.
• Other (Nature of Need): Cognitive/behavioral effects, cardiac function.

III. Animal Studies

• High Priority (Nature of Need):
  • Long-term (lifelong) studies: Assess carcinogenic potential using normal & transgenic animals (monitoring DNA damage pathways).
  • Developmental & neurobehavioural studies: Assess potential risks to developing brain (morphology, neurobehavioural assays).
• Other (Nature of Need): Cardiac effects under very high fields (10-20 T); study multiple endpoints in a single animal study.

IV. Cellular Studies & Mechanisms

• High Priority (Nature of Need):
  • Mutagenicity/transformation in primary human cells: Investigate potential link to cancer using human cells.
  • Interaction mechanisms (radical pairs, enzymes, radicals): Explore mechanisms underlying biological effects.
  • Gene expression studies: Use genomics/proteomics to find molecular markers in primary human cells.
• Other (Nature of Need): Very low-/high-field dosimetry modeling.

V. Dosimetry

• High Priority (Nature of Need):
  • Fine-resolution head-and-neck phantom: Improve models for studying visual phosphenes, vertigo, and head/eye movement in magnetic fields.
  • Detailed heart model: Accurately model induced currents (rhythms, depolarization) under various field orientations.
  • Fetal dosimetry under MRI: Assess currents induced in fetus by maternal/fetal movement in high fields.
• Other (Nature of Need): Use of female, pregnant, and different-sized (male/female/pregnant) voxel phantoms.