title: [Sympathetic nervous system level and ambulatory blood pressure in children with primary nephrotic syndrome].
abstract: OBJECTIVE
  To explore the change in ambulatory blood pressure monitoring (ABPM) value and the sympathetic nervous system (SNS) level in children with primary nephrotic syndrome(PNS) and their relationship.
  
  
  METHODS
  ABPM and casual blood pressure(CBP) were tested in 114 children with PNS and 12 normal children as a control group. The 24-h urine noradrenaline(NA), adrenaline(A) and dopamine(DA) content were detected through high-performance liquid chromatography with electrochemical luminescence and the correlation with ABP was analyzed.
  
  
  RESULTS
  Among 114 children with PNS, 101 had elevated blood pressure (88.6%), 45 showed high incidence of masked hypertension (39.5%), and 80 non-dipper blood pressure (70.2%). Systolic blood pressure level and blood pressure load were greater than diastolic blood pressure. NA, A, and DA levels of the PNS group were significantly higher than those of the control group, while those of the elevated blood pressure group were significantly higher than those of the normal blood pressure group in PNS children. SNS levels were positively correlated with blood pressure levels and blood pressure load, and negatively correlated with night BP decreasing rates.
  
  
  CONCLUSIONS
  Children with PNS have high incidence of hypertension with large proportion of masked hypertension and non-dipper blood pressure. Severe masked hypertension classification should be set up. In PNS children, SNS activity is elevated that might evaluate the blood pressure level and decrease blood pressure circadian rhythm.
authors.affiliation: Laboratory of Pediatric Nephrology, Second Xiangya Hospital, Central South University, Changsha 410011, China. zhiquan_xu@yahoo.com.cn
authors.forename: Zhiquan
authors.initials: Z
authors.lastname: Xu
authors.forename: Zhuwen
authors.initials: Z
authors.lastname: Yi
authors.forename: Xiqiang
authors.initials: X
authors.lastname: Dang
authors.forename: Xiaochuan
authors.initials: X
authors.lastname: Wu
authors.forename: Yan
authors.initials: Y
authors.lastname: Cao
authors.forename: Danlin
authors.initials: D
authors.lastname: Huang
authors.forename: Shuanghong
authors.initials: S
authors.lastname: Mo
authors.forename: Xiaojie
authors.initials: X
authors.lastname: He
mesh_terms: D000293:Adolescent; D001794:Blood Pressure / Q000502:physiology; D018660:Blood Pressure Monitoring, Ambulatory; D016022:Case-Control Studies; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D006973:Hypertension / Q000175:diagnosis* / Q000209:etiology; D008297:Male; D009404:Nephrotic Syndrome / Q000150:complications / Q000503:physiopathology*; D013564:Sympathetic Nervous System / Q000503:physiopathology*