Algometry to measure pain threshold in the horse's back - An in vivo and in vitro study

Una Pongratz; Theresia Licka

doi:10.1186/s12917-017-1002-y

Algometry to measure pain threshold in the horse's back - An in vivo and in vitro study

Una Pongratz, Theresia Licka

Royal (Dick) School of Veterinary Studies

Research output: Contribution to journal › Article › peer-review

Abstract

BACKGROUND: The aim of this study was to provide information on algometric transmission of pressure through the dorsal thoracolumbar tissues of the equine back. Using a commercially available algometer, measurements were carried out with six different tips (hemispheric and cylindrical surfaces, contact areas 0.5 cm(2), 1 cm(2), and 2 cm(2)). In nine live horses the threshold of pressure that lead to any reaction was documented. In postmortem specimens of five euthanized horses the transmission of algometer pressure onto a pressure sensor placed underneath the dorsal thoracolumbar tissues at the level of the ribs or the transverse lumbar processes respectively was measured.

RESULTS: Algometer tips with a contact area of 1 cm(2) led to widely similar results irrespective of the surface shape; these measurements also had the lowest variance. Contact areas of 0.5 cm(2) resulted in a lower pressure threshold, and those of 2 cm(2) resulted in a higher pressure threshold. The hemispheric shape of the contact area resulted in a higher pressure threshold, than the cylindrical contact area. Compared to the thoracic region, a significantly higher pressure threshold was found in the lumbar region in the live horses. This result corresponds to the increased tissue thickness in the lumbar region compared to the thoracic region, also documented as less pressure transmission in the lumbar region on the in vitro specimens.

CONCLUSIONS: Algometry is an easily practicable and well tolerated method to quantify pain but it is important to consider the many factors influencing the results obtained.

Original language	English
Pages (from-to)	80
Journal	BMC Veterinary Research
Volume	13
Issue number	1
Early online date	29 Mar 2017
DOIs	https://doi.org/10.1186/s12917-017-1002-y
Publication status	E-pub ahead of print - 29 Mar 2017

Keywords / Materials (for Non-textual outputs)

Thoracolumbar pain
Horse
Algometry

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10.1186/s12917-017-1002-y

Algometry to measure pain threshold in the horse’s back – An in vivo and in vitro study
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Cite this

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title = "Algometry to measure pain threshold in the horse's back - An in vivo and in vitro study",

abstract = "BACKGROUND: The aim of this study was to provide information on algometric transmission of pressure through the dorsal thoracolumbar tissues of the equine back. Using a commercially available algometer, measurements were carried out with six different tips (hemispheric and cylindrical surfaces, contact areas 0.5 cm(2), 1 cm(2), and 2 cm(2)). In nine live horses the threshold of pressure that lead to any reaction was documented. In postmortem specimens of five euthanized horses the transmission of algometer pressure onto a pressure sensor placed underneath the dorsal thoracolumbar tissues at the level of the ribs or the transverse lumbar processes respectively was measured.RESULTS: Algometer tips with a contact area of 1 cm(2) led to widely similar results irrespective of the surface shape; these measurements also had the lowest variance. Contact areas of 0.5 cm(2) resulted in a lower pressure threshold, and those of 2 cm(2) resulted in a higher pressure threshold. The hemispheric shape of the contact area resulted in a higher pressure threshold, than the cylindrical contact area. Compared to the thoracic region, a significantly higher pressure threshold was found in the lumbar region in the live horses. This result corresponds to the increased tissue thickness in the lumbar region compared to the thoracic region, also documented as less pressure transmission in the lumbar region on the in vitro specimens.CONCLUSIONS: Algometry is an easily practicable and well tolerated method to quantify pain but it is important to consider the many factors influencing the results obtained.",

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author = "Una Pongratz and Theresia Licka",

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doi = "10.1186/s12917-017-1002-y",

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N2 - BACKGROUND: The aim of this study was to provide information on algometric transmission of pressure through the dorsal thoracolumbar tissues of the equine back. Using a commercially available algometer, measurements were carried out with six different tips (hemispheric and cylindrical surfaces, contact areas 0.5 cm(2), 1 cm(2), and 2 cm(2)). In nine live horses the threshold of pressure that lead to any reaction was documented. In postmortem specimens of five euthanized horses the transmission of algometer pressure onto a pressure sensor placed underneath the dorsal thoracolumbar tissues at the level of the ribs or the transverse lumbar processes respectively was measured.RESULTS: Algometer tips with a contact area of 1 cm(2) led to widely similar results irrespective of the surface shape; these measurements also had the lowest variance. Contact areas of 0.5 cm(2) resulted in a lower pressure threshold, and those of 2 cm(2) resulted in a higher pressure threshold. The hemispheric shape of the contact area resulted in a higher pressure threshold, than the cylindrical contact area. Compared to the thoracic region, a significantly higher pressure threshold was found in the lumbar region in the live horses. This result corresponds to the increased tissue thickness in the lumbar region compared to the thoracic region, also documented as less pressure transmission in the lumbar region on the in vitro specimens.CONCLUSIONS: Algometry is an easily practicable and well tolerated method to quantify pain but it is important to consider the many factors influencing the results obtained.

AB - BACKGROUND: The aim of this study was to provide information on algometric transmission of pressure through the dorsal thoracolumbar tissues of the equine back. Using a commercially available algometer, measurements were carried out with six different tips (hemispheric and cylindrical surfaces, contact areas 0.5 cm(2), 1 cm(2), and 2 cm(2)). In nine live horses the threshold of pressure that lead to any reaction was documented. In postmortem specimens of five euthanized horses the transmission of algometer pressure onto a pressure sensor placed underneath the dorsal thoracolumbar tissues at the level of the ribs or the transverse lumbar processes respectively was measured.RESULTS: Algometer tips with a contact area of 1 cm(2) led to widely similar results irrespective of the surface shape; these measurements also had the lowest variance. Contact areas of 0.5 cm(2) resulted in a lower pressure threshold, and those of 2 cm(2) resulted in a higher pressure threshold. The hemispheric shape of the contact area resulted in a higher pressure threshold, than the cylindrical contact area. Compared to the thoracic region, a significantly higher pressure threshold was found in the lumbar region in the live horses. This result corresponds to the increased tissue thickness in the lumbar region compared to the thoracic region, also documented as less pressure transmission in the lumbar region on the in vitro specimens.CONCLUSIONS: Algometry is an easily practicable and well tolerated method to quantify pain but it is important to consider the many factors influencing the results obtained.

KW - Thoracolumbar pain

KW - Horse

KW - Algometry

U2 - 10.1186/s12917-017-1002-y

DO - 10.1186/s12917-017-1002-y

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SN - 1746-6148

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ER -

Algometry to measure pain threshold in the horse's back - An in vivo and in vitro study

Abstract

Keywords / Materials (for Non-textual outputs)

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