High-risk pattern. Fetuses at greatest risk include those with marked bradycardia, recurrent late and variable decelerations, and absent variability.
Normal pattern. In contrast, a normal baseline rate with normal, moderate variability and accelerations, and absence of periodic patterns (decelerations) predicts fetal well-being.
Tips on interpretation. Deciphering fetal heart rate patterns entails making observations over time. Many patterns acquire increased significance when there is a trend toward persistent, significant departures from baseline with decreased variability, loss of accelerations, or persistent episodic or periodic decelerations, particularly with loss of variability.