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Related Experiment Videos

How heel oxygenation changes under pressure.

Vivian K Wong1, Nancy A Stotts, Harriet W Hopf

  • 1School of Nursing, San Jose State University, San Jose, California 95192-0057, USA. Vivian.wong@sjsu.edu

Wound Repair and Regeneration : Official Publication of the Wound Healing Society [And] the European Tissue Repair Society
|November 22, 2007
PubMed
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Heel pressure from bed surfaces significantly reduces skin oxygen in hip surgery patients. This decrease, even after pressure removal, may indicate a higher risk for pressure ulcers.

Area of Science:

  • Biomedical Engineering
  • Clinical Nursing
  • Surgical Patient Care

Background:

  • Heel pressure ulcers are a concern for hip surgery patients.
  • The underlying mechanisms, particularly the impact of external pressure on tissue oxygenation, remain unclear.

Purpose of the Study:

  • To investigate the effect of bed surface pressure on heel skin oxygen tension in adults during the initial 3 days post-hip surgery.

Main Methods:

  • A prospective, repeated-measures study involving 18 hip surgery patients.
  • Transcutaneous oxygen sensors measured heel skin oxygen tension under varying pressure conditions (suspended, loaded, unloaded) on room air and with oxygen challenge.
  • Measurements were taken on room air and with an oxygen challenge.

Main Results:

Related Experiment Videos

  • Both loading and unloading phases significantly reduced bilateral heel oxygen tension compared to preload.
  • This reduction occurred without the expected hyperemic response.
  • Oxygen tension did not return to baseline levels after pressure removal.

Conclusions:

  • Short periods of external pressure significantly decrease heel oxygen tension in hip surgery patients.
  • The lack of a hyperemic response and failure to return to baseline suggest a potential increased risk for heel pressure ulcers.
  • Further research is required to elucidate the mechanisms behind this sustained decrease in oxygenation.