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Related Experiment Videos

Cryopreserved human aortic root allografts arterial wall: Structural changes occurring during thawing.

Robert Novotny1, Dasa Slizova2, Jaroslav Hlubocky1

  • 12nd Department of Cardiovascular Surgery, General University Hospital & 1st Faculty of Medicine, Charles University, Prague, Czech Republic.

Plos One
|April 18, 2017
PubMed
Summary

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Thawing cryopreserved human aortic root allografts at room temperature (23°C) causes less arterial wall damage than thawing in a 37°C water bath. Room temperature thawing preserves arterial structure and prevents smooth muscle cell contraction.

Area of Science:

  • Biomedical Engineering
  • Cardiovascular Surgery
  • Tissue Engineering

Background:

  • Cryopreservation of human aortic root allografts (CHARA) is crucial for cardiovascular tissue transplantation.
  • Understanding the impact of thawing protocols on CHARA structural integrity is essential for clinical application.

Purpose of the Study:

  • To evaluate and compare the morphological alterations in CHARA arterial walls subjected to two distinct thawing methods.
  • To determine the optimal thawing protocol for preserving CHARA viability and structural integrity.

Main Methods:

  • Two thawing protocols were investigated: room temperature (23°C) and a 37°C water bath.
  • Standardized sample preparation, including fixation, dehydration, and gold coating, was employed for scanning electron microscopy.

Related Experiment Videos

  • Morphological changes in the arterial wall layers, including endothelium and tunica media, were assessed.

    • Main Results:

    • Thawing at 23°C resulted in endothelium loss and subendothelial layer damage with micro-fractures, but no smooth muscle cell contraction.
    • Thawing at 37°C led to endothelium loss, subendothelial fractures, and significant smooth muscle cell contraction in the tunica media.
    • All samples exhibited some degree of endothelial cell loss and subendothelial layer damage.

    Conclusions:

    • Room temperature thawing (23°C) demonstrates a superior preservation of CHARA structural integrity compared to water bath thawing (37°C).
    • The absence of smooth muscle cell contraction in the tunica media during room temperature thawing is a key advantage.
    • These findings suggest that controlled, lower-temperature thawing is preferable for maintaining the quality of allograft tissues.