Med Biol Eng Comput - Effects of fetal respiratory movements on the short-term fractal properties of heart rate variability.

Tópicos

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Resumo

We evaluated the effect of fetal respiratory movements (RM) on the heart rate (HR) fractal dynamics.Abdominal ECG recordings were collected from low-middle-risk pregnant woman at rest. Mean gestational age was 34.8???3.7?weeks. Ultrasound images were simultaneously acquired determining if RM were exhibited by fetuses. 13 pairs of HR series were compared. Each pair included 5?min of data from the same fetus either during the manifestation of RM or when there was no persistent indication of them. Detrended fluctuation analysis was applied to these series for obtaining the scaling exponent a1. HR series were also assessed using the conventional parameters RMSSD and HF power.The main findings of this contribution were the lack of significant changes in the scaling exponent a1 of fetal HR fluctuations as a result of RM. By contrast, HF power and RMSSD did show significant changes associated with the manifestation of fetal RM (p?<?0.001 and p?<?0.05, respectively). Yet the scaling exponent was the only parameter showing a significant relationship with the particular frequency of fetal RM (r s ?=?0.6, p?<?0.03). Given the invariability of a1 regarding the manifestation of fetal RM, we consider that the HR short-term fractal properties are convenient for assessing the cardiovascular prenatal regulation.

Resumo Limpo

evalu effect fetal respiratori movement rm heart rate hr fractal dynamicsabdomin ecg record collect lowmiddlerisk pregnant woman rest mean gestat age week ultrasound imag simultan acquir determin rm exhibit fetus pair hr seri compar pair includ min data fetus either manifest rm persist indic detrend fluctuat analysi appli seri obtain scale expon hr seri also assess use convent paramet rmssd hf powerth main find contribut lack signific chang scale expon fetal hr fluctuat result rm contrast hf power rmssd show signific chang associ manifest fetal rm p p respect yet scale expon paramet show signific relationship particular frequenc fetal rm r s p given invari regard manifest fetal rm consid hr shortterm fractal properti conveni assess cardiovascular prenat regul

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