New advances in the biochemical diagnosis of pheochromocytoma - Moving beyond catecholamines

被引:45
作者
Lenders, JWM
Pacak, K
Eisenhofer, G
机构
[1] NINDS, Clin Neurocardiol Sect, NIH, Bethesda, MD 20892 USA
[2] NICHHD, Pediat & Reprod Endocrinol Branch, NIH, Bethesda, MD 20892 USA
[3] St Radboud Univ, Med Ctr, Dept Internal Med, Nijmegen, Netherlands
来源
ENDOCRINE HYPERTENSION | 2002年 / 970卷
关键词
pheochromocytoma; normetanephrine; metanephrine; norepinephrine; epinephrine; diagnosis; adrenal incidentaloma; von Hippel-Lindau disease; multiple endocrine neoplasia type 2;
D O I
10.1111/j.1749-6632.2002.tb04410.x
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
Pheochromocytomas are dangerous tumors that, although a rare cause of hypertension, require consideration among large numbers of patients. The resulting low prevalence of the tumor among tested populations and the inadequacies of commonly used biochemical tests make excluding or confirming the tumor an often difficult and time-consuming task. Recognition that catecholamines are metabolized to free metanephrines within pheochromocytoma tumor cells, and that this process is independent of catecholamine release, provides a rationale for use of these metabolites in the biochemical diagnosis of pheochromocytoma. Here we briefly review the history of biochemical diagnosis of pheochromocytoma in relation to recent data about the diagnostic utility of plasma free metanephrines for detection of these tumors. Measurements of urinary or plasma catecholamines have reasonable sensitivity for detection of most pheochromocytomas, particularly those in patients with sustained hypertension. False-negative test results can, however, occur in asymptomatic patients tested because of an adrenal incidentaloma or a familial predisposition for pheochromocytoma, or when sampling is carried out between episodes of paroxysmal hypertension. Measurements of urinary total metanephrines or vanillylmandelic acid are less reliable and are of little value as initial screening tests. In contrast, measurements of plasma concentrations or free metanephrines or 24-hour urinary outputs of fractionated normetanephrine and metanephrine almost always reveal the tumor. Although, both tests have similarly high sensitivity, the relatively low specificity of urinary fractionated metanephrines means that pheochromocytomas can be more efficiently excluded or confirmed using measurements of plasma free metanephrines.
引用
收藏
页码:29 / 40
页数:12
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