fetal tachycardia
Abnormally fast fetal heart rate, typically defined as sustained rate above 160 beats per minute.
Full Definition
Fetal tachycardia is defined as a sustained fetal heart rate above 160 beats per minute for more than 10 minutes. Common causes include maternal fever, fetal infection, maternal medications, fetal anemia, and fetal arrhythmias. Unlike bradycardia, mild tachycardia (160-180 bpm) is often benign if associated with good variability and no other concerning features. Severe tachycardia (>180 bpm) or tachycardia with poor variability may indicate fetal compromise requiring intervention. Assessment includes evaluation of maternal temperature, hydration status, and medications.
Usage
Usage note: Specify degree of tachycardia and associated findings; often resolves with treatment of underlying cause.
In Context
- "Fetal tachycardia of 175 bpm was noted in association with maternal fever of 38.5°C." — Labor monitoring note
- "Persistent fetal tachycardia with minimal variability prompted delivery by cesarean section." — Operative delivery report