Cardiotocography Archives - Revista Brasileira de Ginecologia e Obstetrícia

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    Computerized Antepartum Cardiotocography Analysis in High Risk Pregnancies

    Revista Brasileira de Ginecologia e Obstetrícia. 2002;24(1):29-36

    Summary

    Trabalhos Originais

    Computerized Antepartum Cardiotocography Analysis in High Risk Pregnancies

    Revista Brasileira de Ginecologia e Obstetrícia. 2002;24(1):29-36

    DOI 10.1590/S0100-72032002000100005

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    Purpose: to study computerized cardiotocography performed in high-risk pregnancies, analyze the results, and correlate the criteria to perinatal results. Patients and Methods: two hundred and thirty-three high-risk pregnancies were studied prospectively, performing a total of 485 computerized cardiotocographies. The exclusion criteria included fetal anomalies and signal loss over 20% (proportion of 3.75-millisecond periods in which there were no valid pulse intervals). The perinatal results of 71 pregnancies were correlated to the last cardiotocography, performed at least seven days before birth, excluding patients with absent or reversed end diastolic velocities in the umbilical arteries. Results: thirty-three examinations with signal loss over 20% were excluded. The normal criteria were met in 404 (83.3%), and 62.1% examinations met the criteria within 20 minutes and 79% within 30 minutes. The abnormal computerized cardiotocography was related significantly (p<0.05) to adverse perinatal results, such as: preterm delivery, first minute Apgar score less than 7 (33%), neonatal intensive care admission (55.5%) and intubation of newborn at delivery (44.4%). Conclusions: computerized cardiotocography in high-risk pregnancies met the normal criteria in most of the cases, with the examination performed for 30 minutes. The cases that did not meet the criteria correlated significantly to adverse perinatal results.

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