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Heart rate variability (HRV) analysis is affected by ectopic beats. An efficient method was proposed to deal with the ectopic
beats. The method was based on trend correlation of the heart timing signal. Predictor of R-R interval (RRI) value at ectopic
beat time was constructed by the weight calculation and the slope estimation of preceding normal RRI. The type of ectopic
beat was detected and replaced by the predictor of RRI. The performance of the simulated signal after ectopic correction was
tested by the standard value using power spectrum density (PSD) estimation, whereas the results of clinical data with ectopic
beats were compared with the adjacent ectopic-free data. The result showed the frequency indexes after ectopy corrected had
less error than other methods with the test of simulated signal and clinical data. It indicated our method could improve the
PSD estimation in HRV analysis. The method had advantages of high accuracy and real time properties to recover the sinus node
modulation. 相似文献
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Maya Roche V. P. Arun Kumar S. M. Ibrahim K. Nalini 《Indian journal of clinical biochemistry : IJCB》2008,23(4):352-355
Antitryptic, antichymotryptic and alpha 2- macroglobulin activities were measured in sera of normal nonpregnant and normal
pregnant women and women with tubal ectopic pregnancy and molar pregnancies in the first 5 to 7 weeks of pregnancy calculated
from the last menstrual period. While alpha 2-macroglobulin decreased in early normal pregnancy compared to nonpregnant state
(p<0.001), in ectopic and molar pregnancies there was an increase in alpha 2- macroglobulin activity (p < 0.001), as compared
to nonpregnant and normal pregnant women. Antitryptic activity did not increase in normal and ectopic pregnancy, however was
increased in molar pregnancy (p < 0.01). Antichymotryptic activities did not show a change either in normal pregnancy or in
cases of ectopic and molar pregnancy. Drop in alpha 2- macroglobulin activity to near normal levels in ectopic, 6 weeks post
surgery, correlated well with the decrease in β-hCG. However, in molar pregnancy, alpha 2- macroglobulin remained elevated
even when the β-hCG levels in serum returned to zero 10 weeks after surgery. The studies suggest a major role for circulating
proteinase inhibitors especially alpha 2-macroglobulin in regulating proteinase activity in normal, ectopic and molar pregnancy. 相似文献
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目的通过对异位妊娠的声像图特征和误漏诊原因分析,以提高异位妊娠早期的超声诊断水平.方法将86例异位妊娠的声像图表现和诊断与手术后病理结果对比分析.结果超声诊断符合率为87.2%(75/86).主要声像图表现为盆腔内不同回声的包块,子宫正常或稍增大,盆腹腔内游离液体.结论超声诊断异位妊娠要注意结合临床及β-HCG检查综合分析、超声动态观察,阴道超声与腹部超声互补应用. 相似文献
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