Improved Diagnostic Accuracy of Clonidine Suppression Testing Using an Age-Related Cutoff for Plasma Normetanephrine

Moderately elevated plasma normetanephrine (NMN) levels are frequent among patients with suspected pheochromocytoma and paraganglioma (PPGL). Clonidine suppression testing (CST) is recommended to distinguish patients with from those without PPGL. We aimed at evaluating the diagnostic outcome of CST...

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Published in:Hypertension (Dallas, Tex. 1979) Tex. 1979), 2022-06, Vol.79 (6), p.1257-1264
Main Authors: Remde, Hanna, Pamporaki, Christina, Quinkler, Marcus, Nölting, Svenja, Prejbisz, Aleksander, Timmers, Henri J.L.M., Masjkur, Jimmy, Fuss, Carmina T., Fassnacht, Martin, Eisenhofer, Graeme, Deutschbein, Timo
Format: Article
Language:English
Subjects:
Adrenal Gland Neoplasms - pathology
Clonidine
Humans
Metanephrine
Normetanephrine
Paraganglioma - diagnosis
Paraganglioma - pathology
Pheochromocytoma
Prospective Studies
Retrospective Studies
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Summary:Moderately elevated plasma normetanephrine (NMN) levels are frequent among patients with suspected pheochromocytoma and paraganglioma (PPGL). Clonidine suppression testing (CST) is recommended to distinguish patients with from those without PPGL. We aimed at evaluating the diagnostic outcome of CST in patients with moderate NMN elevations. Data from patients participating in the PMT study (Prospective Monoamine-Producing Tumor) and the ENSAT (European Network for the Study of Adrenal Tumours) registry in 6 European reference centers were analyzed retrospectively. Eighty-nine patients with suspected PPGL and moderate NMN elevations upon screening were included. During follow-up, PPGL was confirmed in 16 and excluded in 73 cases. Plasma NMN was measured by liquid chromatography tandem mass spectrometry before and 180 minutes after oral clonidine. Receiver operating characteristic analysis was performed to identify optimal cutoffs. If published diagnostic criteria for CST (ie, NMN ≥112 ng/L and NMN suppression
ISSN:0194-911X
1524-4563
DOI:10.1161/HYPERTENSIONAHA.122.19019