Randomized Comparison of Home Uterine Activity Monitoring and Routine Care in Patients Discharged After Treatment for Preterm Labor

OBJECTIVE:To determine whether home uterine activity monitoring reduces the likelihood of preterm birth in women successfully treated for preterm labor in their current pregnancies. METHODS:Women between 20-34 weeksʼ gestation who had been treated successfully for preterm labor were solicited to participate in a randomized clinical trial of home uterine activity monitoring versus routine high-risk care. The sample size of 56 was based on power calculations using the results of earlier investigators. Twenty-eight women were randomized to home uterine activity monitoring and 29 were assigned to the type of care appropriate for women discharged after hospitalization for parenteral treatment of preterm labor. One of the routine-care subjects was lost to follow-up. The two groups were comparable in distribution for race, insurance status, multiple gestation, marital status, gestational age at beginning of the study, and incidence of prior preterm birth. RESULTS:The 28 women receiving routine care had a 54% incidence of preterm birth, whereas the incidence was 57% in monitored women (relative risk 1.08, 95% confidence interval 0.6-1.9; P=.79). The incidences of delivery before 32 weeks and 34 weeks also were unaffected by the intervention. CONCLUSION:Home uterine activity monitoring is not effective in reducing the likelihood of preterm delivery in patients successfully treated for preterm labor in their current pregnancies.