Bradycardia

Bradycardia is defined as FHR less than 110 beats/min for at least 10 minutes. Mild bradycardia ranges between 100 and 110 beats/min. Mild bradycardia with normal variability is

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Figure 21-11 Variability in fetal heart rate (FHR). Definitions from National Institute of Child Health and Human Development. (Redrawn from Cunningham FG, Leveno KL, Bloom SL, etat. Williams Obstetrics, 2nd ed. New York, McGraw-Hill, 2005. http://www.accessmedicine.com.

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so not associated with fetal acidosis and is considered reassuring. Moderate bradycardia of 80 to 100 beats/min is considered a nonreassuring pattern. Bradycardia less than 80 beats/min is considered ominous and is often a terminal event (Fig. 21-12). There are numerous etiologies for fetal bradycardia (Box 21-9).

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