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Pressure Sore Etiology - Highlighted with Optical Measurements of the Blood Flow
Publication Type:
Licentiate Thesis
Publisher:
Mälardalen University Press
Abstract
Abstract
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 superfcial 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 fowmetry and photoplethysmography. With
the design of the sensor, measurements of the superfcial 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.
Bibtex
@misc{Kaisdotter Andersson (Jonsson)933,
author = {Annika Kaisdotter Andersson (Jonsson)},
title = {Pressure Sore Etiology - Highlighted with Optical Measurements of the Blood Flow},
number = {63},
month = {May},
year = {2006},
publisher = {M{\"a}lardalen University Press},
url = {http://www.es.mdu.se/publications/933-}
}
