Med Biol Eng Comput - Comparison of real beat-to-beat signals with commercially available 4?Hz sampling on the evaluation of foetal heart rate variability.

Tópicos

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Resumo

Evaluation of foetal heart rate (FHR) variability is an essential part of foetal monitoring, but a precise quantification of this parameter depends on the quality of the signal. In this study, we compared real FHR beat-to-beat signals with 4?Hz sampling provided by commercial foetal monitors on linear and nonlinear indices and analysed their clinical implications. Simultaneous acquisition of beat-to-beat signals and their 4?Hz sampling rate counterparts was performed using a scalp electrode, during the last hour of labour in 21 fetuses born with an umbilical artery blood (UAB) pH?=?7.20 and 6 born with an UAB pH?<?7.20. For each case, the first and last 10?min segments were analysed, using time and frequency domain linear, and nonlinear FHR indices, namely mean FHR, low frequency, high frequency, approximate, sample and multiscale entropy. Significant differences in variability indices were found between beat-to-beat and 4?Hz sampled signals, with a lesser effect seen with 2?Hz sampling. These differences did not affect physiological changes observed during labour progression, such as decreased entropy and linear time domain indices, and increased frequency domain indices. However, significant differences were found in the discrimination between fetuses born with different UAB pHs, with beat-to-beat sampling providing better results in linear indices and 4?Hz sampling better results in entropy indices. In conclusion, different FHR sampling frequencies can significantly affect the quantification of variability indices. This needs to be taken into account in the interpretation of FHR variability and in the development of new equipment.

Resumo Limpo

evalu foetal heart rate fhr variabl essenti part foetal monitor precis quantif paramet depend qualiti signal studi compar real fhr beattobeat signal hz sampl provid commerci foetal monitor linear nonlinear indic analys clinic implic simultan acquisit beattobeat signal hz sampl rate counterpart perform use scalp electrod last hour labour fetus born umbil arteri blood uab ph born uab ph case first last min segment analys use time frequenc domain linear nonlinear fhr indic name mean fhr low frequenc high frequenc approxim sampl multiscal entropi signific differ variabl indic found beattobeat hz sampl signal lesser effect seen hz sampl differ affect physiolog chang observ labour progress decreas entropi linear time domain indic increas frequenc domain indic howev signific differ found discrimin fetus born differ uab phs beattobeat sampl provid better result linear indic hz sampl better result entropi indic conclus differ fhr sampl frequenc can signific affect quantif variabl indic need taken account interpret fhr variabl develop new equip

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