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Clinical factors affecting spot urine fractionated metanephrines in patients suspected pheochromocytoma/paraganglioma

Hypertension Research volume 43, pages 543–549 (2020)Cite this article

Abstract

Urinary measurement of fractionated metanephrines is one of the best available biochemical tests for the diagnosis of pheochromocytoma and paraganglioma; however, false-positive results remain an issue. In addition, despite their convenience, there is no evidence to suggest that spot urine samples should replace the standard 24-h urine collection method. The objective of this study is to elucidate clinical variables that may influence the levels of spot urine fractionated metanephrines and to examine their instability. The study is a retrospective review of prospectively collected data from 949 patients whose spot urine fractionated metanephrines were measured under suspicion of pheochromocytoma or paraganglioma at our institution from January 2011 to June 2017. The effects of clinical factors such as age, sex, renal function, and medications on the level of spot urine fractionated metanephrines were evaluated. Urinary fractionated metanephrines were significantly higher in female subjects. They correlated with age but not with estimated glomerular filtration rate (eGFR). A multivariate regression model for urinary fractionated metanephrine levels revealed that age, female sex, eGFR, and the presence of α1-blocker medication were significantly positively correlated with urinary metanephrine (M) levels. Age, female sex, eGFR, and presence of α1-blockers and antidepressant and antipsychotic medications positively correlated with urinary normetanephrine (NM). In addition, age, female sex, eGFR, and presence of α1-blockers and antidepressant and antipsychotic medications were positively correlated with urinary M + NM. In conclusion, sex, age, eGFR, and treatment with α1-blockers, antidepressants, and antipsychotics may affect the levels of urinary fractionated metanephrines. When assessing urinary fractionated metanephrines in patients with suspected PPGLs, we must consider these factors.

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Acknowledgements

This study was supported in part by a JSPS KAKENHI Grant Number 16H05316 to AI.

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  1. Department of Endocrinology and Hypertension, Tokyo Women’s Medical University, Tokyo, Japan

    Kanako Bokuda, Midori Yatabe, Yasufumi Seki & Atsuhiro Ichihara

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  1. Kanako Bokuda
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  2. Midori Yatabe
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  3. Yasufumi Seki
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Correspondence to Midori Yatabe.

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Bokuda, K., Yatabe, M., Seki, Y. et al. Clinical factors affecting spot urine fractionated metanephrines in patients suspected pheochromocytoma/paraganglioma. Hypertens Res 43, 543–549 (2020). https://doi.org/10.1038/s41440-020-0406-4

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