Effect of extremely low frequency electromagnetic field on brain histopathology of Caspian Sea Cyprinus carpio.

PAPER pubmed Electromagnetic biology and medicine 2017 Animal study Effect: harm Evidence: Low

Read original paper → DOI: 10.3109/15368378.2016.1144064 PMID: 27362452 Evidence Lab

Abstract

There is limited research on the effect of electromagnetic field on aquatic organisms, especially freshwater fish species. This study was conducted to evaluate the effect of extremely low frequency electromagnetic field (ELF-EMF) (50 Hz) exposure on brain histopathology of Cyprinus carpio, one of the important species of Caspian Sea with significant economic value. A total of 200 healthy fish were used in this study. They were classified randomly in two groups: sham-exposed group and experimental group, which were exposed to five different magnetic field intensities (0.1, 1, 3, 5, and 7 mT) at two different exposure times (0.5 and 1 h). Histologic results indicate that exposure of C. carpio to artificial ELF-EMF caused severe histopathological changes in the brain at field intensities ≥3 mT leading to brain necrosis. Field intensity and duration of exposure were key parameters in induction of lesion in the brain. Further studies are needed to elucidate exact mechanism of EMF exposure on the brain.

AI evidence extraction

At a glance

Study type

Animal study

Effect direction

harm

Population

Cyprinus carpio (Caspian Sea carp)

Sample size

200

Exposure

ELF · 5.0E-5 MHz · 0.5 and 1 h

Evidence strength

Low

Confidence: 78% · Peer-reviewed: yes

Main findings

In Cyprinus carpio, exposure to artificial 50 Hz ELF-EMF produced severe histopathological changes in the brain at magnetic field intensities ≥3 mT, reported to lead to brain necrosis. Field intensity and exposure duration were described as key parameters in lesion induction.

Outcomes measured

Brain histopathology
Brain lesions
Brain necrosis

Limitations

Mechanism not elucidated (authors note further studies needed)
Exposure source/setup details not provided in abstract beyond frequency, intensity, and duration
Outcome limited to histopathology (no functional/behavioral endpoints described)

View raw extracted JSON

{
    "study_type": "animal",
    "exposure": {
        "band": "ELF",
        "source": null,
        "frequency_mhz": 5.00000000000000023960868011929647991564706899225711822509765625e-5,
        "sar_wkg": null,
        "duration": "0.5 and 1 h"
    },
    "population": "Cyprinus carpio (Caspian Sea carp)",
    "sample_size": 200,
    "outcomes": [
        "Brain histopathology",
        "Brain lesions",
        "Brain necrosis"
    ],
    "main_findings": "In Cyprinus carpio, exposure to artificial 50 Hz ELF-EMF produced severe histopathological changes in the brain at magnetic field intensities ≥3 mT, reported to lead to brain necrosis. Field intensity and exposure duration were described as key parameters in lesion induction.",
    "effect_direction": "harm",
    "limitations": [
        "Mechanism not elucidated (authors note further studies needed)",
        "Exposure source/setup details not provided in abstract beyond frequency, intensity, and duration",
        "Outcome limited to histopathology (no functional/behavioral endpoints described)"
    ],
    "evidence_strength": "low",
    "confidence": 0.7800000000000000266453525910037569701671600341796875,
    "peer_reviewed_likely": "yes",
    "keywords": [
        "extremely low frequency",
        "ELF-EMF",
        "50 Hz",
        "magnetic field intensity",
        "mT",
        "fish",
        "Cyprinus carpio",
        "brain",
        "histopathology",
        "necrosis"
    ],
    "suggested_hubs": []
}

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AI-extracted fields are generated from the abstract/metadata and may be incomplete or incorrect. This content is for informational purposes only and is not medical advice.

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