Twenty-Four-Hour Urinary Sodium Excretion and Postural Orthostatic Tachycardia Syndrome

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• 作者：Qingyou Zhang ; MD¹ ; Ying Liao ; MD¹ ; Chaoshu Tang ; MD² ; Junbao Du ; MD¹ ; Hongfang Jin ; PhD¹ ; ^{jinhongfang51@126.com}
• 关键词：POTS ; Postural orthostatic tachycardia syndrome ; ROC ; Receiver operating characteristic curve
• 刊名：The Journal of Pediatrics
• 出版年：2012
• 出版时间：August, 2012
• 年：2012
• 卷：161
• 期：2
• 页码：281-284
• 全文大小：132 K

文摘

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Objective

To investigate whether 24-hour urinary sodium excretion could be an indicator of the effectiveness of salt supplementation in children with postural orthostatic tachycardia syndrome (POTS).

Study design

The patient group comprised 30 children with POTS, and the control group comprised 10 healthy children. Serum sodium and 24-hour urinary sodium excretion were measured in all children, and the relationship between 24-hour urinary sodium and symptom severity was analyzed in the 30 patients. At 1 month after initiation of salt supplementation, the receiver operating characteristic curve was used to explore the probability of correctly discriminating responders to salt supplementation from nonresponders using 24-hour urinary sodium excretion as an indicator.

Results

Patients with POTS had lower 24-hour urinary sodium excretion than controls (P = .022). Symptom severity was negatively correlated with 24-hour urinary sodium excretion (OR, ?0.754; P = .000). The receiver operating characteristic curve demonstrated a sensitivity of 76.9 % and specificity of 93 % for correct prediction of responders and nonresponders to salt supplementation when a 24-hour urinary sodium excretion of 124 mmol/24 hours was used as the cutoff value.

Conclusion

Our results indicate that 24-hour sodium excretion of <124 mmol/24 hours is an indicator of the effectiveness of salt supplementation in children and adolescents with POTS.