Fetal heart rate regresses toward the mean in the third trimester

The purpose of this study was to investigate the feasibility of different fetal heart rate (FHR) ranges in the nonstress test (NST) and to better understand the meaning of mild bradycardia and/or tachycardia without non-reassuring patterns. We employed the heredity to show that mild bradycardia (100...

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Bibliographic Details
Published in:Journal of Korean medical science 2012, 27(7), 166, pp.794-798
Main Authors: Park, Young-Sun, Hoh, Jeong-Kyu, Park, Moon-Il
Format: Article
Language:English
Subjects:
Acoustic Stimulation
Bradycardia - physiopathology
Female
Fetal Monitoring
Heart Rate, Fetal - physiology
Humans
Original
Pregnancy
Pregnancy Trimester, Third
Regression Analysis
Tachycardia - physiopathology
의학일반
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Summary:The purpose of this study was to investigate the feasibility of different fetal heart rate (FHR) ranges in the nonstress test (NST) and to better understand the meaning of mild bradycardia and/or tachycardia without non-reassuring patterns. We employed the heredity to show that mild bradycardia (100-119 beats per minute, bpm) and mild tachycardia (161-180 bpm) regressed to the normal FHR range (120-160 bpm). We used linear regression to analyze FHR data from FHR tracings recorded 10 min before (NST, as the predictor) and 10 min after vibroacoustic stimulation testing (as the dependent variable). Acceleration for 15 bpm-15 seconds (Acc1515) and deceleration for 15 bpm-15 seconds (Dec1515) in the NST were also analyzed for each group. The slope of the best-fit line was the largest in the mild bradycardia group and the smallest in the normal range group. Dec1515 was most prominent in mild tachycardia and both the mild bradycardia and tachycardia groups regressed towards the mean FHR range. Therefore, we propose that both mild bradycardia and tachycardia of FHR in non-acute situations (range between 100 and 180 bpm) are not regarded a pathologic signal for clinical use.
ISSN:1011-8934
1598-6357
DOI:10.3346/jkms.2012.27.7.794