Characteristics and significance of the latent phase in the outcome of labor among Nigerian parturients.

The characteristics and significance of the latent phase in labor among 716 West African parturients were studied. A wide variation in duration (1 to 70 hours) of this phase was noted. A consistent correlation was found between the duration of the latent phase and subsequent events, such as the duration of the active phase, duration of ruptured membranes, and the total modes of delivery. This correlation holds true to all parities even when latent phase duration is within normal limits. No difference was noted in the incidence of abnormal latent phase between the primigravida and the multigravida. Although these findings have potentially useful but limited application, the significant correlation with Apgar score at 1 minute and the association of larger breeches with prolonged latent phase are sufficient predictive indices of great value to the obstetrician in the prompt management of such labors.