| Effects of support surface relief pressures on heel skin blood perfusion. | |
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MedLine Citation:
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PMID: 12789036 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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OBJECTIVE: To investigate the effect of pressure-relief magnitude on heel blood flow. DESIGN: 12 healthy subjects (5 male, 7 female; 21 to 43 years of age) lay on a support surface for 50 minutes with 1 heel on the end cell of the support surface. Cell pressure was computer controlled to vary cyclically at 5-minute intervals between a constant 20 mm Hg during loading and 10, 5, and 0 mm Hg during off-loading. Heel skin blood perfusion was monitored by laser Doppler probes on the heel and foot dorsum. Average skin blood perfusion during each 10-minute cycle and the hyperemic response after pressure relief were determined absolutely and relative to baseline. SETTING: University research center. RESULTS: An inverse relationship was found between relief pressure and heel skin blood perfusion over each pressurization-relief cycle and during the hyperemia phase. Full-cycle average skin blood perfusion associated with release to 0, 5, and 10 mm Hg were 34.1 +/- 7.5 arbitrary units (AU), 26.4 +/- 7.5 AU, and 9.3 +/- 3.3 AU, respectively (P <.001). CONCLUSIONS: The reduced average skin blood perfusion is attributable to blunting of hyperemia when relief pressure is too high. When it corresponded to an interface pressure near diastolic pressure, little, if any, functional pressure relief or hyperemia is realized. Suitable relief pressures are likely dependent on an individual's diastolic blood pressure and the net tissue forces acting on heel blood vessels. This suggests that lower blood pressures need lower pressure-relief levels. It is suspected that if depressed vascular responsiveness and/or diminished hyperemic reserve is also present, even lower relief pressures are needed. |
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Authors:
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Harvey N Mayrovitz; Nancy Sims; Martha C Taylor; Lori Dribin |
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Publication Detail:
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Type: Clinical Trial; Comparative Study; Controlled Clinical Trial; Journal Article |
Journal Detail:
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Title: Advances in skin & wound care Volume: 16 ISSN: 1527-7941 ISO Abbreviation: Adv Skin Wound Care Publication Date: 2003 May-Jun |
Date Detail:
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Created Date: 2003-06-05 Completed Date: 2003-07-23 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 100911021 Medline TA: Adv Skin Wound Care Country: United States |
Other Details:
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Languages: eng Pagination: 141-5 Citation Subset: N |
Affiliation:
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College of Medical Sciences, Nova Southeastern University, Ft. Lauderdale, FL, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Beds / standards* Blood Pressure Diastole Female Heel / blood supply*, ultrasonography Humans Hyperemia / etiology, physiopathology, ultrasonography Laser-Doppler Flowmetry Male Pressure Pressure Ulcer / etiology, physiopathology, prevention & control* Pulsatile Flow |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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