ABSTRACT
The normal-term FHR pattern has identifiable features corresponding to various behavioral states (Figure 176.1). These include a stable baseline rate and absent decelerations and alternating epochs of (a) decreased variability and absent accelerations (sleep/rest) and (b) average variability and accelerations associated with fetal movement (awake/active).22-29
When present, these features, particularly including the cyclic activity, permit the inference of both normal fetal behavior (neurologic integrity) and absent hypoxia. They represent the fundamental properties of the FHR pattern of the normally oxygenated and neurologically responsive fetus, who will not likely deteriorate from hypoxia, sepsis, or trauma without changes in baseline rate and variability.
