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The detection of cervical intraepithelial neoplasia by electrical impedance spectroscopy: The effects of acetic acid and tissue homogeneity

Balasubramani, L., Brown, B.H., Healey, J. and Tidy, J.A. (2009) The detection of cervical intraepithelial neoplasia by electrical impedance spectroscopy: The effects of acetic acid and tissue homogeneity. Gynecologic Oncology, 115 (2). pp. 267-271. ISSN 0090-8258

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Objective. To evaluate the efficacy of an electrical impedance probe (Epitheliometer) in the diagnosis of high grade cervical intraepithelial neoplasia (CIN) in women referred with cervical smear abnormalities and to assess the effect of acetic acid (AA) and tissue boundaries on the measurements.

Methods. A prospective observational study was undertaken in the colposcopy clinic. One hundred and sixty-five women, either with a clinical indication or abnormal cervical cytology, were recruited into the study. A pencil type probe was used to record impedance spectra from 12 points on the cervix before and after the application of 5% AA. Spectra were also recorded from tissue boundaries. Colposcopic examinations, including probe positioning, were video recorded to allow for correlations between histopathological diagnosis of colposcopically directed biopsies, colposcopic impression and the diagnosis based on impedance measurements.

Results. Receiver operating characteristic (ROC) curves were derived. The areas under the curves (AUCs) to discriminate original squamous from high grade CIN were 0.80 (pre AA) and 0.79 (post AA). Comparison of these curves showed no significant difference, indicating that application of AA does not produce a large change in spectra. The probe Could distinguish tissue boundaries from homogeneous tissue points.

Conclusion. The Epitheliometer has the potential to be used as an adjunct to colposcopy in the diagnosis of high grade CIN. It has the advantage of real time results, decreasing the need for diagnostic cervical biopsies, and facilitates a wider use of the 'see and treat' policy without the risk of overtreatment. (C) 2009 Elsevier Inc. All rights reserved.

Item Type: Article
Copyright, Publisher and Additional Information: © 2009 Elsevier. This is an author produced version of a paper subsequently published in Gynecologic Oncology. Uploaded in accordance with the publisher's self-archiving policy.
Keywords: Cervical intraepithelial neoplasia; Electrical impedance; Colposcopy
Institution: The University of Sheffield
Academic Units: The University of Sheffield > Faculty of Medicine, Dentistry and Health (Sheffield) > School of Medicine (Sheffield) > Clinical Sciences Division South (Sheffield) > Department of Medical Physics and Clinical Engineering (Sheffield)
Depositing User: Miss Anthea Tucker
Date Deposited: 23 Nov 2009 09:50
Last Modified: 08 Feb 2013 16:59
Published Version: http://dx.doi.org/10.1016/j.ygyno.2009.08.010
Status: Published
Publisher: Elsevier
Refereed: Yes
Identification Number: 10.1016/j.ygyno.2009.08.010
URI: http://eprints.whiterose.ac.uk/id/eprint/10185

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