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Cardiovascular toxicities upon manganese exposure.

Yueming Jiang1, Wei Zheng

  • 1Department of Occupational Health and Toxicology, Guangxi Medical University, Nanning, Guangxi, PRC.

Cardiovascular Toxicology
|December 31, 2005
PubMed
Summary

Manganese exposure is linked to abnormal heart rhythms and lower blood pressure in workers. Animal studies show manganese accumulates in heart tissue, causing cardiovascular issues via mitochondrial damage.

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Area of Science:

  • Environmental Health
  • Cardiology
  • Toxicology

Background:

  • Manganese (Mn) is known to cause Parkinsonism, but its cardiovascular effects are less understood.
  • Existing literature provides limited data on manganese's impact on cardiovascular function.

Purpose of the Study:

  • To review and summarize existing animal and human studies on manganese's effects on cardiovascular function.
  • To highlight the association between manganese exposure and cardiovascular dysfunction.

Main Methods:

  • Literature review of clinical, epidemiological, and animal studies.
  • Analysis of electrocardiogram (ECG) abnormalities and blood pressure in manganese-exposed populations.
  • Examination of animal models to understand manganese accumulation and cellular mechanisms in the heart.

Main Results:

  • Manganese-exposed workers show a higher incidence of abnormal ECGs (e.g., tachycardia, bradycardia, ST-T changes).
  • Accelerated heart rate and shortened P-R intervals are more pronounced in female exposed workers.
  • Exposed workers, particularly young females, exhibit significantly lower diastolic blood pressure.
  • Animal studies confirm rapid manganese accumulation in heart tissue, leading to cardiodepression and hypotension.

Conclusions:

  • Manganese exposure poses a significant risk for cardiovascular dysfunction, including ECG abnormalities and hypotension.
  • Manganese-induced cardiovascular toxicity is potentially mediated by mitochondrial damage and calcium channel interactions.
  • Further research is warranted to fully elucidate the mechanisms and long-term cardiovascular consequences of manganese exposure.

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