Altered Fractal and Irregular Heart Rate Behavior in Sick Fetuses
Abstract
The purpose of this study was to show that abnormal fractal correlation and irregularity of heart rate behavior were altered in intrauterine growth restricted fetuses (IUGR group) and fetuses whose mothers had maternal pregnancy induced hypertension (PIH group). We analyzed fetal heart rate data of 5000 points in normal (n=98), IUGR (n=45), and PIH (n=46) fetuses, with their gestational ages > 38 weeks and without any perinatal complication. We calculate approximate entropy for the quantifying irregularity, and short-range (< or equal to 80 beats, alpha 1) and long-range (>80 beats, alpha 2) fractal scaling exponent for quantifying the fractal correlation properties. We also performed spectral analysis. In the IUGR group, statistical, the spectral measures, alpha 2, and alpha 2/alpha 1 were significantly higher and the approximate entropy was significantly lower than in the normal group. In the PIH group, alpha 1 was significantly lower and alpha 2 and alpha 2/alpha 1 were significantly higher. The fetuses associated with either IUGR or PIH, although they are not severely compromised, showed abnormal fractal and/or irregular heart rate behavior.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 2000
- Accession Number
- ADP010902
Entities
People
- Jung Hye Hwang
- Moon Il Park
- Myung Kul Yum
Organizations
- Hanyang University