mdh.sePublications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Pressure sore etiology - highlighted with optical measurements of the blood flow
Mälardalen University, Department of Computer Science and Electronics.
2006 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

In line with the quality awareness of good prevention of pressure sores and in treatment of those sores already developed, evaluation of antidecubitus mattresses plays an important role. However, there are shortages in the evaluations performed today, since often interface pressure is the only parameter regarded. Since ischaemia in the tissue is the primary cause of pressure sore, the focus in this thesis is on blood flow measurements in tissue exposed external loading. To study the tissue blood flow would give a better and more direct indication on the mattress effectiveness in minimizing the negative effects on the tissue viability.

The results presented in this thesis reveal that the superficial blood flow in areas prone to pressure sore development, is affected by increased skin temperature and external loading of the tissue. Both the effects from pressure and shear stress have been studied.

Measurements of the tissue blood flow is interesting to relate to the two theories about at which tissue layer the pressure sores start to develop. To achieved more knowledge about the pressure sore etiology and also be able to non-invasively measure the tissue blood flow for evaluations of antidecubitus mattresses an optical sensor has been developed. The sensor combines the two optical methods, laser Doppler flowmetry and photoplethysmography. With the design of the sensor, measurements of the superficial skin blood flow and the deeper blood flow, even the muscle blood flow, can be performed. Measurement depths of 2 mm, 8 mm, and 20 mm into the tissue is assumed.

Preliminary result from measurements performed with the optical sensor in four test subjects, revealed great individual differences in blood flow, but also different response to the same external loading at different measurement depths, in the same individual. This new optical sensor is likely to be of great value in future studies of pressure sore etiology and in future evaluations of antidecubitus mattresses.

Place, publisher, year, edition, pages
Västerås: Mälardalens högskola , 2006. , p. 49
Series
Mälardalen University Press Licentiate Theses, ISSN 1651-9256 ; 63
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Elektronik
Identifiers
URN: urn:nbn:se:mdh:diva-135ISBN: 91-85485-11-X (print)OAI: oai:DiVA.org:mdh-135DiVA, id: diva2:120505
Presentation
2006-05-11, Kappa, Mälardalens högskola, Högskoleplan 1, 721 23 Västerås, 10:00
Opponent
Supervisors
Available from: 2006-04-18 Created: 2006-04-18
List of papers
1. Evaluation of antidecubitus mattresses
Open this publication in new window or tab >>Evaluation of antidecubitus mattresses
Show others...
2005 (English)In: Medical & Biological Engineering & Computing, ISSN 0140-0118, Vol. 43, no 5, p. 541-547Article in journal (Refereed) Published
Abstract [en]

Pressure sores are a current problem in hospitals and care of the elderly, leading to protracted hospital stays and a high care burden. The trauma for the patients is severe, and the cost of pressure sore prevention and treatment, is considerable. Antidecubitus mattresses are used for prevention and in treatment, but they also contribute to the cost of treating pressure sores. The problem highlighted in the review is that the mattresses' effectiveness in preventing and treating pressure sores has not been sufficiently evaluated. When antidecubitus mattresses are evaluated, it is often only with regard to aspects of the interface pressure and the mattresses' ability to redistribute the pressure. The review points out the important observation that, to be able to evaluate the efficacy of the antidecubitus mattress, the mattress's effect on tissue viability needs to be studied. The parameters that ought to be considered when evaluating a support surface are: interface pressure, pressure and blood flow distribution, temperature and humidity in the skin-support surface interface. The authors propose that the effect on tissue viability of external loading can be assessed by simultaneous measurement of the interface pressure and tissue perfusion.

National Category
Engineering and Technology
Identifiers
urn:nbn:se:mdh:diva-3995 (URN)10.1007/BF02351025 (DOI)000234262300001 ()2-s2.0-29244476864 (Scopus ID)
Available from: 2006-04-18 Created: 2006-04-18 Last updated: 2016-01-11Bibliographically approved
2. Skin temperature effects on the skin blood flow at areas prone to pressure sore development
Open this publication in new window or tab >>Skin temperature effects on the skin blood flow at areas prone to pressure sore development
2005 (English)In: IFMBE Proceedings: NBC'05 Umeå 13th Nordic Baltic Conference Biomedical Engineering and Medical Physics, 2005, p. 140-141Conference paper, Published paper (Other academic)
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:mdh:diva-3996 (URN)
Conference
NBC'05 Umeå 13th Nordic Baltic Conference Biomedical Engineering and Medical Physics
Available from: 2006-04-18 Created: 2006-04-18 Last updated: 2015-07-27Bibliographically approved
3. Peripheral circulatory response to shear stress applied to the sacral region
Open this publication in new window or tab >>Peripheral circulatory response to shear stress applied to the sacral region
(English)Manuscript (Other academic)
National Category
Medical Engineering
Identifiers
urn:nbn:se:mdh:diva-3997 (URN)
Available from: 2006-04-18 Created: 2006-04-18 Last updated: 2015-10-12Bibliographically approved
4. New optical sensor design made to discriminate between tissue blood flow at different tissue depths at the sacral area
Open this publication in new window or tab >>New optical sensor design made to discriminate between tissue blood flow at different tissue depths at the sacral area
(English)Manuscript (Other academic)
Identifiers
urn:nbn:se:mdh:diva-3998 (URN)
Available from: 2006-04-18 Created: 2006-04-18 Last updated: 2010-01-13Bibliographically approved

Open Access in DiVA

fulltext(604 kB)1592 downloads
File information
File name FULLTEXT01.pdfFile size 604 kBChecksum SHA-1
06fa34832892f8bbceb679bbd2ac1104d3c70d8be21d9c9976cbfeaecf13fd09bf5ef44a
Type fulltextMimetype application/pdf

By organisation
Department of Computer Science and Electronics
Other Electrical Engineering, Electronic Engineering, Information Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 1592 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

isbn
urn-nbn

Altmetric score

isbn
urn-nbn
Total: 567 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf