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- W2810440747 abstract "The lack of specific biomarkers makes the diagnosis of hereditary angioedema (HAE) with normal levels of C1-inhibitor (C1INH) protein (HAE-nl-C1INH) and idiopathic non-histaminergic angioedema (INHA) difficult. Confirming or excluding these diagnoses is a significant challenge for clinicians evaluating patients with angioedema.To develop a reliable biomarker that would aid the diagnosis of HAE-nl-C1INH and INHA.A total of 154 consecutive patients referred for angioedema at a single centre were enrolled and evaluated. Subjects were clinically phenotyped based on clinical history and response to treatment by clinicians blinded to laboratory assay results. Plasma kallikrein activity was measured by the cleavage of the fluorometric substrate Z-Phe-Arg-AMC-HCL in plasma samples stimulated ex vivo with submaximal doses of dextran sulphate.Stimulated plasma kallikrein activity (mean relative fluorescence units/min ± SD) was significantly increased in both HAE-nl-C1INH (1804 ± 600) and INHA (1579 ± 371) subjects compared to non-swelling controls (171 ± 46) and histaminergic angioedema (133 ± 30) subjects. Using a threshold cut-off based on the normal controls, HAE-nl-C1INH and INHA subjects could be differentiated from histaminergic angioedema subjects with high sensitivity (negative predictive value 86%-89%) and specificity (positive predictive value 80%-100%).The stimulated kallikrein activity assay allows differentiation of bradykinin- from histamine-mediated angioedema. The assay could feasibly be considered as a potential clinical tool for the diagnosis of bradykinin-mediated angioedema." @default.
- W2810440747 created "2018-07-10" @default.
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- W2810440747 date "2018-08-21" @default.
- W2810440747 modified "2023-10-12" @default.
- W2810440747 title "Threshold-stimulated kallikrein activity distinguishes bradykinin- from histamine-mediated angioedema" @default.
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- W2810440747 doi "https://doi.org/10.1111/cea.13219" @default.
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