Evaluation of fetal acidemia during delivery using the conventional 5-tier classification and Rainbow systems

• Published in: PloS one Vol. 18; no. 6; p. e0287535
• Main Authors: Magawa, Shoichi, Maki, Shintaro, Nii, Masafumi, Yamaguchi, Mizuki, Tamaishi, Yuya, Enomoto, Naosuke, Takakura, Sho, Toriyabe, Kuniaki, Kondo, Eiji, Ikeda, Tomoaki
• Format: Journal Article
• Language: English
• Published: United States Public Library of Science 23.06.2023; Public Library of Science (PLoS)
• Subjects: Acidosis; Analysis; Apgar score; Biology and Life Sciences; Blood; Blood gas analysis; Cardiovascular disease; Childbirth; Childbirth & labor; Classification; Complications and side effects; Cord blood; Evaluation; Female; Fetal Blood; Fetal Diseases; Fetal heart rate monitoring; Fetuses; Gas analysis; Heart; Heart beat; Heart rate; Heart Rate, Fetal - physiology; Hospitals; Humans; Hydrogen-Ion Concentration; Hypoxia; Induced labor; Medicine and Health Sciences; Newborn babies; Patient outcomes; Pattern classification; Physical Sciences; Pregnancy; Rainbows; Reading; Time Factors; Umbilical Cord; Japan; United Kingdom > UK
• ISSN: 1932-6203; 1932-6203
• DOI: 10.1371/journal.pone.0287535

The association between prepartum time-series fetal heart rate pattern changes and cord blood gas data at delivery was examined using the conventional 5-tier classification and the Rainbow system for 229 female patients who delivered vaginally. They were classified into three groups based on the results of umbilical cord blood gas analysis at delivery. The fetal heart rate pattern classifications were based on analysis of measurement taken at 10-min intervals, beginning at 120 min pre-delivery. The relationship between fetal heart rate pattern classification and cord blood pH at delivery changed over time. The 5-tier classification at each interval increased before delivery in the Mild and Severe groups compared with the Normal group. No significant differences were observed between acidemia groups. The Rainbow classification showed a significant differences between the acidemia groups at each interval, particularly during the prepartum period. A relationship between classification and outcome was evident before delivery for both the 5-tier classification and Rainbow system.