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Subzero 12-hour Nonfreezing Cryopreservation of Porcine Heart in a Variable Magnetic Field.

Transplantation direct · 2015 · Benefit · Low evidence

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BenefitLow evidencePaper 2925

Compared with conventional 4°C preservation, nonfreezing preservation at -3°C in a variable magnetic field for 12 hours showed higher myocardial ATP, lower accumulated lactate, and lower Flameng scores, indicating reduced anaerobic metabolism and less mitocho…

Study snapshot

PublicationTransplantation direct · 2015
Study typeanimal
Reported directionBenefit
Evidence ratingLow

Abstract

BACKGROUND: A novel subzero nonfreezing heart preservation method has been developed. It uses a refrigerating device that generates a variable magnetic field, allowing the whole organ to be cooled simultaneously to a supercooled state without the use of cryoprotectant. As a fundamental experiment for heart preservation, we verified whether this novel method is able to suppress anaerobic metabolism and reduce damage in the hearts of large animals. METHODS: Twelve porcine hearts were collected and preserved for 12 hours using a simple immersion method. The hearts were divided into 2 groups: 6 underwent nonfreezing preservation at -3°C in a variable magnetic field (subzero group), and 6 underwent conventional preservation at 4°C (conventional group). The quantity of anaerobic metabolism and the degree of ultrastructural change in the 2 groups were evaluated and compared. RESULTS: The concentration of adenosine triphosphate in the myocardial tissue was significantly greater in the subzero group than in the conventional group (21.06±5.87 μmol/g vs 5.96±3.41 μmol/g; P < 0.05). The accumulated lactate concentration was significantly lower in the subzero group than in the conventional group (6.58±2.28 μmol/g vs 11.15±3.74 μmol/g; P < 0.05). The Flameng score, an index of ultrastructural changes to the mitochondria, was significantly lower in the subzero group than in the conventional group (1.28±0.40 vs 2.73±0.30; P < 0.05). CONCLUSIONS: Subzero nonfreezing preservation using a variable magnetic field resulted in a remarkable suppression of anaerobic metabolism and myocardial protection in porcine hearts.

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AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typeanimal
Effect directionbenefit
PopulationPorcine hearts (ex vivo organ preservation)
Sample size12
Exposure12 hours
Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

Compared with conventional 4°C preservation, nonfreezing preservation at -3°C in a variable magnetic field for 12 hours showed higher myocardial ATP, lower accumulated lactate, and lower Flameng scores, indicating reduced anaerobic metabolism and less mitochondrial ultrastructural damage.

Outcomes measured

  • Myocardial tissue adenosine triphosphate (ATP) concentration
  • Accumulated lactate concentration
  • Flameng score (mitochondrial ultrastructural changes)

Limitations

  • Fundamental experiment in porcine hearts (animal/ex vivo model); generalizability to human transplantation not addressed in abstract
  • Small sample size (n=12; 6 per group)
  • Magnetic field parameters (e.g., frequency/strength) not reported in abstract
  • Simple immersion method; clinical transplantation outcomes not evaluated
View raw extracted JSON
{
  "study_type": "animal",
  "exposure": {
    "band": null,
    "source": "variable magnetic field (refrigerating device for organ preservation)",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": "12 hours"
  },
  "population": "Porcine hearts (ex vivo organ preservation)",
  "sample_size": 12,
  "outcomes": [
    "Myocardial tissue adenosine triphosphate (ATP) concentration",
    "Accumulated lactate concentration",
    "Flameng score (mitochondrial ultrastructural changes)"
  ],
  "main_findings": "Compared with conventional 4°C preservation, nonfreezing preservation at -3°C in a variable magnetic field for 12 hours showed higher myocardial ATP, lower accumulated lactate, and lower Flameng scores, indicating reduced anaerobic metabolism and less mitochondrial ultrastructural damage.",
  "effect_direction": "benefit",
  "limitations": [
    "Fundamental experiment in porcine hearts (animal/ex vivo model); generalizability to human transplantation not addressed in abstract",
    "Small sample size (n=12; 6 per group)",
    "Magnetic field parameters (e.g., frequency/strength) not reported in abstract",
    "Simple immersion method; clinical transplantation outcomes not evaluated"
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "variable magnetic field",
    "subzero nonfreezing preservation",
    "supercooling",
    "cryopreservation",
    "porcine heart",
    "anaerobic metabolism",
    "ATP",
    "lactate",
    "Flameng score",
    "mitochondria"
  ],
  "suggested_hubs": [
    {
      "slug": "engineering",
      "weight": 0.55,
      "reason": "Uses a refrigerating device generating a variable magnetic field for organ preservation."
    }
  ]
}
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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.1097/txd.0000000000000544
PubMed: 27500233

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