OBJECTIVE:

Calculate and adjust the multiples of the median (MoMs) for the mean pulsatility index of uterine arteries (IPm Aut), mean arterial pressure (PAM), placental growth factor (PlGF) and plasma protein associated with pregnancy (PAPP-A), in order to assess the diagnostic performance of the corrected preeclampsia model of the fetal medicine foundation in the Mexican population.

MATERIALS AND METHODS:

Case-control study nested in a prospective cohort conducted at the “Dr. Galo Soberón y Parra ”from October 1, 2015 - June 30, 2016. Patients with pregnancy of 11-13.6 weeks were included, multiple pregnancies or older than 14 weeks were excluded and patients with medication intake prior to pregnancy; Patients who decided to leave the study were eliminated. Autm IPm, PAM, PlGF and PAPP-A serum values were evaluated. The difference in the distribution of biomarkers between that observed in the Mexican population and that expected was compared according to the original formula of the Fetal Medicine Foundation. When the difference was greater than 0.2 MoMs, the median observed was used as an adjustment coefficient to the original expected formula.

RESULTS:

Of the 300 patients recruited, 292 concluded the study. The average gestational age at the time of screening was 12.4 weeks (standard deviation [SD] 0.72). The prevalence of preeclampsia was 4.5% (13/292). Important differences were found in the distribution of multiples of the median (MoMs) for IPm Aut, PlGF and PAPP-A. After correction of the biomarkers, the sensitivity, false positives and area under the curve (AUC) of the model adjusted to detect any preeclampsia was 92% (12/13), 5.7% (16/279) and 93.3%, respectively .

CONCLUSIONS:

The distribution of MoMs in the Mexican population is different for the PlGF, PAPP-A and IPm Aut biomarkers. The adjustment of these biomarkers to the Mexican population results in a good diagnostic performance of the preeclampsia model.