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What is the "normal" fetal heart rate?
Stephanie Pildner von Steinburg1, Anne-Laure Boulesteix, Christian Lederer
1Frauenklinik und Poliklinik der Technischen Universität München , Munich , Germany.
Peerj
|June 14, 2013
Summary
The normal fetal heart rate (FHR) range is 120 to 160 beats per minute (bpm). This study analyzed over 78,000 cardiotocography tracings to establish a precise FHR baseline.
Area of Science:
- Perinatology
- Fetal Monitoring
- Cardiotocography
Background:
- Current international guidelines lack consensus on normal fetal heart rate (FHR) baseline ranges, with recommendations varying between 110-150 bpm and 110-160 bpm.
- Establishing a precise definition of normality is crucial for accurate FHR interpretation and fetal well-being assessment.
Purpose of the Study:
- To define a precise and validated normal range for fetal heart rate (FHR) baseline using a large dataset of cardiotocography (CTG) tracings.
- To evaluate the accuracy and external validity of the derived FHR normal range across multiple medical centers and time periods.
Main Methods:
- Retrospective analysis of 78,852 high-quality cardiotocography tracings from singleton pregnancies in three German medical centers (2000-2007).
- Extraction of baseline FHR using a 'delayed moving windows' algorithm to exclude accelerations and decelerations.
- A training set (40%) was used to establish a hypothetical normal range, followed by validation on the remaining 60% and external datasets.
Main Results:
- The analysis identified a normal FHR baseline range of 120 to 160 beats per minute (bpm).
- Fetal heart rate was observed to decrease slightly throughout gestation.
- The derived range of 120-160 bpm demonstrated external validity across different datasets.
Conclusions:
- The established normal range for fetal heart rate (FHR) is 120 to 160 bpm.
- While current guidelines using 110-160 bpm appear safe in practice, further research is needed to confirm the safety of asymmetric alarm limits, particularly the lower bound.
- Investigating methods to improve the utility of cardiotocography (CTG) monitoring is recommended.
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