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- W1978811704 abstract "Objective To assess whether intrapartum acidosis affects specific components of fetal heart rate variability. Design Prospective clinical study. Setting Twelve Nordic delivery units. Subjects Fetal heart rate variability was studied in 334 fetuses divided into two groups according to cord pH value: the acidotic group (cord arterial pH <7.05 at birth, n = 15) and the control group (cord arterial pH ≥7.05 at birth, n = 319). Methods In spectral analysis of fetal heart rate variability, frequencies were integrated over the total frequency band (0.04–1.0 Hz), low‐frequency band (0.04–0.15 Hz) and high‐frequency band (0.15–1.0 Hz). We also calculated the low‐to‐high frequency ratio. Main outcome measures The spectral bands of fetal heart rate variability were compared between the acidotic and control fetuses. Results We found that during the last hour of monitoring, baseline fetal heart rate gradually decreased, whereas total, low‐frequency and high‐frequency fetal heart rate variability initially increased but then, near the delivery, decreased in the acidotic fetuses when compared with the controls. Low‐to‐high frequency ratio was greater in the acidotic group during the whole study period ( P = 0.002). Cord artery pH was inversely associated with total fetal heart rate variability ( P < 0.001), low‐frequency fetal heart rate variability ( P < 0.001) and low‐to‐high frequency ratio ( P = 0.004). Conclusions Marked fetal acidosis was associated with frequency‐specific changes in fetal heart rate variability as reflecting the compensation ability of autonomic nervous activation during the last hour of labour." @default.
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- W1978811704 date "2005-02-19" @default.
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- W1978811704 title "Marked fetal acidosis and specific changes in power spectrum analysis of fetal heart rate variability recorded during the last hour of labour" @default.
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- W1978811704 doi "https://doi.org/10.1111/j.1471-0528.2004.00454.x" @default.
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