Orthostatic plasma norepinephrine level as a predictor for therapeutic response to metoprolol in children with postural tachycardia syndromeReportar como inadecuado




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Journal of Translational Medicine

, 12:249

Cardiovascular, Metabolic and Lipoprotein Translation

Abstract

BackgroundPostural tachycardia syndrome POTS is a heterogeneous disorder that creates challenges for treatment. Beta-blocker was one of the most commonly used drugs, but it is inconsistently effective. The purpose of this study is to explore whether orthostatic plasma norepinephrine level could be an indicator of therapeutic effectiveness of metoprolol for POTS in children.

MethodsTwenty-seven children with POTS were enrolled in our study. They received metoprolol treatment, and their orthostatic plasma norepinephrine levels were measured by high-performance liquid chromatography method. Three months after rmetoprolol treatment, 25 patients were followed up. A receiver-operating characteristic ROC curve was used to explore the predictive value of orthostatic plasma norepinephrine level.

ResultsThe symptom severity and increment of heat rate from supine position to upright of patients positively correlated with their orthostatic plasma norepinephrine level r = 0.599, P < 0.001; r = 0.633, P <0.001, respectively. Orthostatic plasma norepinephrine level in responders to metoprolol was significantly higher than that of nonresponders P = 0.028. A ROC curve on the predictive value of orthostatic plasma norepinephrine level showed that the area under the curve was 0.785. Using a cutoff value for orthostatic plasma norepinephrine level of 3.59 pg-ml yielded both sensitivity 76.9% and specificity 91.7% in predicting the efficacy of metoprolol therapy for POTS.

ConclusionOrthostatic plasma norepinephrine level of > 3.59 pg-ml was an indicator of the effectiveness of metoprolol therapy for POTS in children and adolescents.

KeywordsNorepinephrine Postural tachycardia syndrome Metoprolol AbbreviationsPOTSPostural tachycardia syndrome

ROCReceiver-operating characteristic

HUTHead-up test

HUTTHead-up tilt test

OIOrthostatic intolerance

CIConfidence interval

Electronic supplementary materialThe online version of this article doi:10.1186-s12967-014-0249-3 contains supplementary material, which is available to authorized users.

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Autor: Qingyou Zhang - Xia Chen - Jiawei Li - Junbao Du

Fuente: https://link.springer.com/







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