title: Electrical impedance spectroscopy (EIS) in the urinary bladder: the effect of inflammation and edema on identification of malignancy.
abstract: Previous studies have shown that tetrapolar electrical impedance spectroscopy measurements can identify cervical interstitial neoplasia with the same sensitivity and specificity as cervical smears. In the urinary bladder, the same technique yields significant differences (p < 0.05 at seven frequencies between 9.6 and 614 kHz) between normal and malignant urothelium, but is unable to classify individual measurements. Detailed histological examination demonstrates that inflammation and edema--both of which are common in abnormal urothelium--alter the impedance spectrum significantly in opposing directions. Consideration of morphological changes in abnormal urothelium suggests alternative measurement strategies.
authors.forename: R H
authors.initials: RH
authors.lastname: Smallwood
authors.forename: A
authors.initials: A
authors.lastname: Keshtkar
authors.forename: B A
authors.initials: BA
authors.lastname: Wilkinson
authors.forename: J A
authors.initials: JA
authors.lastname: Lee
authors.forename: F C
authors.initials: FC
authors.lastname: Hamdy
mesh_terms: D002278:Carcinoma in Situ / Q000175:diagnosis; D002295:Carcinoma, Transitional Cell / Q000175:diagnosis; D003556:Cystitis / Q000175:diagnosis / Q000473:pathology; D003937:Diagnosis, Differential; D004487:Edema / Q000175:diagnosis / Q000473:pathology; D017097:Electric Impedance; D006801:Humans; D066298:In Vitro Techniques; D009092:Mucous Membrane / Q000503:physiopathology; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014054:Tomography / Q000379:methods*; D001745:Urinary Bladder Diseases / Q000175:diagnosis* / Q000473:pathology*; D001749:Urinary Bladder Neoplasms / Q000175:diagnosis / Q000473:pathology