title: Relationship between heart rate variability indexes and common biochemical markers in normal and hypertensive third trimester pregnancy.
abstract: BACKGROUND
  In this study, we explored the correlations between heart rate variability indexes and some biochemical markers during the third trimester of normal, hypertensive, and preeclamptic pregnancies.
  
  
  RESULTS
  The obtained indexes are associated with complexity and spectral variables calculated from short electrocardiographic records.
  
  
  CONCLUSIONS
  Including all the subjects in the analysis, we found that complexity indexes are positively related with hemoglobin concentration in the pathologic group and uric acid blood levels whereas low frequency (LF) was negatively correlated with uric acid and creatinine concentration as well as positively correlated with platelet levels. The LF was the only spectral region with significant correlation. Through an independent analysis of groups, only significant correlations were found in normal and preeclamptic groups between LF and uric acid concentration and in normal and hypertensive groups for LF and creatinine blood levels.
authors: Department of Biochemistry, Faculty of Pharmacy, University of Porto, Porto, Portugal. edutp00@yahoo.com
authors: Eduardo
authors: E
authors: Tejera
authors: Maria Jose
authors: MJ
authors: Areias
authors: Ana Isabel
authors: AI
authors: Rodrigues
authors: Ana
authors: A
authors: Ramõa
authors: Jose Manuel
authors: JM
authors: Nieto-Villar
authors: Irene
authors: I
authors: Rebelo